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Articles de revues sur le sujet « Surface alpha radioactivity »

Auteur : Grafiati

Publié le 9 mars 2023

Mis à jour le 31 juillet 2025

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1

Cfarku, Florinda, and Irma Berdufi. "GROSS ALPHA/BETA ACTIVITY DETERMINATIONIN DRINKING WATER PROFICIENCY TESTS." Jurnal Ilmiah Ilmu Terapan Universitas Jambi 8, no. 2 (2024): 804–11. http://dx.doi.org/10.22437/jiituj.v8i2.32635.

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Water intended for drinking purposes has to be analyzed first for gross alpha/beta activity according to national and international standards and recommendations. According to Albanian legislation, Article 6, the gross alpha/beta radioactivity concentration in water, should be below the level of 0.1 Bq/L and 1 Bq/L respectively for human consumption. Our laboratory participated in an interlaboratory comparison organized by IAEA Terrestrial Environmental Laboratory under suggestion of ALMERA members. Proficiency Test among environmental radioactivity monitoring laboratories for the determinatio

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2

Kiso, Mizuki, Manaya Taoka, Aoi Sampei, et al. "Effect of sampling face velocity on the ultrafine particle surface collection efficiency of a cellulose membrane filter and a cellulose-glass fiber filter for environmental airborne radioactivity monitoring." Radiation Protection Dosimetry 200, no. 16-18 (2024): 1671–75. http://dx.doi.org/10.1093/rpd/ncae191.

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Abstract Surface collection efficiency (SCE) of a cellulose membrane filter (CMF) and a cellulose-glass fiber filter used in environmental monitoring for alpha-emitting radionuclides from nuclear facilities and natural radioactivity sources was evaluated for particles in the size range of 0.03–0.1 μm at different levels of face velocity. The SCE of the CMF was higher than that of the cellulose-glass fiber filter, and only the membrane filter showed the dependence of SCE on the particle size at higher face velocity. The use of the CMF at higher face velocity in environmental radioactivity monit

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Caridi, Francesco, Domenico Pappaterra, Giovanna Belmusto, and Maurizio D'Agostino. "Radioactivity Measurements in Water: An Overview of the Actual Technologies." Current Nutrition & Food Science 17, no. 6 (2021): 548–52. http://dx.doi.org/10.2174/1573401317666210122091439.

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Among the most significant matrices in the field of environmental radioactivity, water is certainly included, being subject to monitoring and controls to safeguard the environment from possible anthropogenic contamination. The presence of radionuclides in water also constitutes a health risk to human, because its consumption increases the likelihood of incurring cancer. In authors’ laboratory, different experimental techniques were employed to measure radioactivity content of surface and drinking water, according to the Italian Legislation and to the Italian Institute for the Environmental Pro

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Lunardon, Marcello, Paolo Sartori, Pierino De Felice, and Luca Stevanato. "Development of a prototype of monitor for alpha and beta radiation in water using new silicone-based contamination-safe detectors." EPJ Web of Conferences 288 (2023): 06005. http://dx.doi.org/10.1051/epjconf/202328806005.

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We present here the main results of an experimental activity aimed at the realization of a prototype of monitor for alpha and beta radioactivity in water exploiting a novel type of contamination-safe scintillation detector developed by our research group. Due to the short path-length of alpha and beta particles in water and the low detection limits needed to be compliant with the international legislations in matter of radiation safety for water, the detectors to be used for such a kind of instruments should have in general large area, very low intrinsic background and avoid any kind of window

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Hashim, Abdalsattar Kareem, Sara Salih Nayif, Elham Jasim Mohammed, Ali F. Al-Rawaf, and Ali Abid Abojassim. "Environmental Radioactivity of Alpha in Paint samples of Iraqi Markets." IOP Conference Series: Earth and Environmental Science 1262, no. 2 (2023): 022001. http://dx.doi.org/10.1088/1755-1315/1262/2/022001.

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Abstract By using a sealed technology, radon levels were determined, annual effective dose, the effective content of radium, radon exhalation rate and uranium concentrations to be the total 30 samples materials used to paint the walls of buildings and homes in Iraq. It was found that the recommended value for all samples for radon concentration is with low potency radium content of 300 Bq / m3 and 370 Bq / kg respectively. In addition, Annual effective dose in all values was found to be less than the permission level (10 mSv / y). The values of exhalation rate relative to samples lower than th

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K, Charan Kumar. "Study of Atmospheric Instabilities through Radioactivity." Mapana - Journal of Sciences 14, no. 1 (2017): 15–23. http://dx.doi.org/10.12723/mjs.32.3.

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Radon and its progeny concentration are measured at 1m height from surface of Earth in the premises of National Atmospheric Research Laboratory, Gadanki to observe the changes in activity concentration of radon particularly during instabilities that are occurring in the atmosphere. The measurements were carried out using AlphaGUARD and Alpha Progeny Meter for the measurement of radon and its progenies, respectively. It has been observed that, the changes in daily and weekly atmospheric radon levels are related to the stability or turbulence of the lower troposphere. The analysis reveals that f

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Elzain, Abd-Elmoniem A., Hajo Idriss, Yousif Sh Mohammed, et al. "Assessment of radioactivity from selected soil samples from Halfa Aljadida area, Sudan." Radiochimica Acta 107, no. 6 (2019): 489–502. http://dx.doi.org/10.1515/ract-2018-3067.

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Abstract In this research, the results of radon concentration, surface and mass exhalation rates, radium concentration, effective dose rate and the alpha index have been investigated in a number of 198 soil samples that have been collected from various residential locations of Halfa Aljadida area, Sudan. The can technique, containing CR-39 have been used. From our results, the average value of soil gas radon concentration was found to be 1.96±0.22 kBq·m−3. The average values of surface and mass exhalation rates were 1.73±0.19 Bq·m−2·h−1 and 34.79±3.87 mBq·kg−1·h−1, respectively. The radium con

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Tăban, Cecilia Ionela, Ana Maria Benedek, Mihaela Stoia, Maria Denisa Cocîrlea, and Simona Oancea. "A Multivariate Model of Drinking Water Quality Based on Regular Monitoring of Radioactivity and Chemical Composition." Applied Sciences 13, no. 18 (2023): 10544. http://dx.doi.org/10.3390/app131810544.

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From a public health perspective, the monitoring of water quality intended for human consumption belongs to the operational and audit management of the supply zones. Our study explores the spatial and temporal patterns of the parameters of drinking water in Sibiu County, Romania. We related the relevant physical-chemical parameters (ammonia, chlorine, nitrates, Al, Fe, Pb, Cd, Mn, pH, conductivity, turbidity, and oxidizability) and radioactivity (gross alpha activity, gross beta activity, and radon-222 content) from a 5-year survey to the water source (surface water and groundwater, which may

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Kücükömeroglu, B., A. Kurnaz, R. Keser, et al. "Radioactivity in sediments and gross alpha–beta activities in surface water of Fırtına River, Turkey." Environmental Geology 55, no. 7 (2007): 1483–91. http://dx.doi.org/10.1007/s00254-007-1098-7.

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Soniya, S. R., and P. J. Jojo. "Natural radioactivity assessment of surface soil collected from Poovar village of Kerala, India." IOP Conference Series: Materials Science and Engineering 1263, no. 1 (2022): 012034. http://dx.doi.org/10.1088/1757-899x/1263/1/012034.

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Making use of gamma ray spectrometric analysis method, the activities of soil-borne radio-nuclides viz. 226Ra, 232Th and 40K in the surface soil samples from a specific village in coastal county has been determined. The surface soil of living environment in the Poovar village was used for the study. The activity concentration is used for evaluating various radiologically vital parameters such as levels of radium equivalent activity (Raeq), external hazard index (Hex), internal hazard index (Hin), absorbed gamma dose rate (D), outdoor and indoor annual effective dose (AED), representative gamma

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11

Kareem Hashim, Abdalsattar, Laith S. Alhiti, Ali Abid Abojassim, Sally Yakoob Taher, and Ali Saeed Jassim. "Alpha radioactivity in Iraqi market foodstuff: Assessing annual effective dose and lifetime cancer risk." E3S Web of Conferences 583 (2024): 04013. http://dx.doi.org/10.1051/e3sconf/202458304013.

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In this study, integrated passive radon dosimeters with solid-state nuclear trace detectors (CR-39 and CN-85) were used to determine the annual effective dose and excess cancer risk for 25 different food samples in the Iraqi market. The dosimeters were deployed after four weeks of the required radiological equilibrium between radon and radium in the samples stored in sealed beakers. These caps were then quickly replaced with other caps equipped with detectors and stored for 70 days. After the detectors were removed from the samples, an electrochemical etching process was performed in a water b

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Ogundare, F. O., and O. I. Adekoya. "Gross alpha and beta radioactivity in surface soil and drinkable water around a steel processing facility." Journal of Radiation Research and Applied Sciences 8, no. 3 (2015): 411–17. http://dx.doi.org/10.1016/j.jrras.2015.02.009.

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Ito, Hiroshi, Hirohisa Ishiura, Kiseki D. Nakamura та Kentaro Miuchi. "A progress of upgrading α-ray imaging chamber in a low background radioactivity". Journal of Physics: Conference Series 2156, № 1 (2021): 012176. http://dx.doi.org/10.1088/1742-6596/2156/1/012176.

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Abstract Precise measurements of radioactive impurity concentration in the detector materials have been established for various underground particle physics experiments. It is also important to measure the surface radioactive contamination on these materials because their decay products would potentially reduce the fiducial volume of the detector and would also produce background sources via radon emanation. In this study, descriptions on an α-ray imaging chamber based on a gaseous micro-time-projection chamber are reported. A detector upgrade to improve the sensitivity by a suppression of the

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14

Thomas, Rimon, Juan Mantero, Carlos Ruiz Cánovas, et al. "Natural radioactivity and element characterization in pit lakes in Northern Sweden." PLOS ONE 17, no. 3 (2022): e0266002. http://dx.doi.org/10.1371/journal.pone.0266002.

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Northern Sweden has been the object of intense metal mining in the last decades producing several water-filled open-pits, or pit lakes. Most of these pit lakes have been limed to maintain a good water quality and to prevent generation of acidic water that could leach the exposed rocks and release metals into water. The aim of this work was to examine the concentration of stable elements and naturally occurring radionuclides in water and sediment samples from pit lakes originating from non-uranium mining activities in Northern Sweden. Surface water and surface sediments were collected from 27 p

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Janković, Marija, Ivana Jelić, Milica Rajačić, et al. "Distribution of Natural Radionuclides and 137Cs in Urban Soil Samples from the City of Novi Sad, Serbia-Radiological Risk Assessment." Toxics 11, no. 4 (2023): 345. http://dx.doi.org/10.3390/toxics11040345.

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This work presents the natural radioactivity distribution of 21 surface soil samples taken in the city of Novi Sad, Serbia. The analysis for radioactivity was performed using a gas low-level proportional counter for gross alpha and gross beta activity, while the specific activities of radionuclides were determined using HPGe detectors. The gross alpha activity of 20 samples was below the minimum detectable concentration (MDC), while in 1 sample it was 243 Bq kg−1; the gross beta activity ranged from the MDC (11 samples) to 566 Bq kg−1. The gamma spectrometry measurements showed naturally occur

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16

Lewis, R. W., J. L. Harwood, and R. J. Richards. "A method for preparing radiolabelled rat pulmonary surfactant." Biochemical Journal 235, no. 1 (1986): 75–79. http://dx.doi.org/10.1042/bj2350075.

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A method is described for the preparation of rat pulmonary surfactant, radiolabelled specifically in the phosphatidylcholine species, which may be used for degradative studies of the lipoprotein complex. Intravenously administered [methyl-14C]choline chloride is maximally incorporated into alveolar surface surfactant 8 h after injection, and more than 97% of this radiolabel is present in the phosphatidylcholine fraction of the surfactant and, of this, 75% is associated with the dipalmitoyl phosphatidylcholine species. Electron microscopy indicates that the isolated surfactant has a similar phy

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17

Nguyen, Van Thang, Ngoc Ba Vu, and Nguyen Phong Thu Huynh. "Gross alpha and beta radioactivity in food crops and surface soil from Ho Chi Minh City, Vietnam." Journal of Radioanalytical and Nuclear Chemistry 315, no. 1 (2017): 65–73. http://dx.doi.org/10.1007/s10967-017-5631-1.

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18

NOUREDDINE, A., M. BENKRID, A. HAMMADI, et al. "Radioactivity Distribution In Surface And Core Sediment Of The Central Part Of The Algerian Coast: An Estimation Of The Recent Sedimentation Rate." Mediterranean Marine Science 4, no. 2 (2003): 53. http://dx.doi.org/10.12681/mms.228.

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Sediment core samples and marine surface sediments of identical composition, mostly muddy, were collected using a Van Veen type grab and a box corer on board the M.S. Benyahia research vessel (ISMAL), along the Algerian littoral, between Algiers (36Ζ49.9 N/ 03Ζ 02.3 E) and Cherchell (36Ζ 39.4 N/ 02Ζ 12.4 E), during a sampling cruise in September 1997. The samples were analysed to determine the activity concentration of natural radionuclides (uranium and thorium series and 40 K as well) and artificial radionuclides ( 137 Cs and Pu isotopes), using a direct gamma spectrometry for gamma emitters

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19

Joseph, Deepthy Maria, Nithu Ashok, and Antony Joseph. "A systematic study of proton, alpha and cluster decays in Rhenium isotopes using the effective liquid drop model." Modern Physics Letters A 31, no. 05 (2016): 1650031. http://dx.doi.org/10.1142/s0217732316500310.

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Employing the effective liquid drop model (ELDM), half-lives of proton and alpha decays and probable cluster decays are computed and analyzed for different proton-rich and neutron-rich isotopes of Rhenium. The investigation fortifies the phenomenon of cluster radioactivity (CR) in rare earth nuclei and also affirms the pivotal role played by neutron magicity in cluster decays. ELDM data is compared with that of universal decay law (UDL) model and found to be more efficient than the latter one. Apparently, cluster emissions slacken as the neutron number of daughter nucleus goes up and the linea

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20

Hashim, Abdalsattar Kareem, Abbas Rashid Al-Ghanimi, Sanaa Mohammed Ridha Hasan, Tamara Ali Naser, and Ahmed Jumaah Mhawes. "Investigating Radioactive Content in Various Commercially available Flour Samples in Local Iraqi Markets." NeuroQuantology 19, no. 9 (2021): 06–13. http://dx.doi.org/10.14704/nq.2021.19.9.nq21131.

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The study was conducted to assess the radioactivity of alpha concentration of different samples of flour in Karbala mills and some samples in local Iraqi markets. Alpha sensitive CR-39 plastic paths detectors commonly know as "Solid State Nuclear paths Detectors" were used measuring the concentrations of uranium, efficaious radium content, and ratio of radon. The results indicate that the exhalation levels of mass and surface radon were between 0.214-0.549 mBq/kg.h, and 4.35 -11.185 mBq/m2.h, respectively, with an mediam of 0.385 mBq/kg.h and 7.691 mBq/m2.h. The effective radium content values

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21

Takekawa, Shoichi, Yoshihiko Ueda, Yoshihiko Ueda, Yoshihiro Hiramatsu, Hirotsugu Munechika, and Fumio Shishido. "Imaging of Beta-Rays from Tissue Blocks with Thorotrast Deposition by Autoradiography using Fuji Computed Radiography." Jurnal Radiologi Indonesia 1, no. 2 (2015): 58–64. http://dx.doi.org/10.33748/jradidn.v1i2.7.

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Background: Autoradiography of tissue with radioactive substance such as Thorotrast by Fuji Computed Radiography (FCR) has been available. We obtained autoradiographs from Thorotrast-deposited tissue by FCR. However, the nature of radiation from tissue with Thorotrast was not certain, because alpha particles are shielded by the plastic front of the FCR cassette. Therefore, we undertook investigation to clearly explain the nature of radiation from Thorotrast in case of autoradiography.Materials and Methods: Tissue blocks of liver and spleen with Thorotrast deposition were imaged by autoradiogra

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Taoufiq, Laila, Fatimaezzahra Arrakhiz, El Mehdi Guendouli, and Mimoun Chourak. "Indoor air quality in buildings: Assessment of exposure to enhanced natural radioactivity." E3S Web of Conferences 601 (2025): 00025. https://doi.org/10.1051/e3sconf/202560100025.

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Our study aimed to assess air quality within buildings constructed with coal ash concrete, with a specific focus on radon measurement. Coal ash, a by-product of the TAQA Morocco thermal power plant. In this investigation, two concrete mixtures were prepared. It is possible that concrete produced from coal ash may contain elevated levels of radon, a naturally occurring radioactive gas that could prove detrimental to human health, given that coal ash contains considerable quantities of radioactive elements. To this regard, two nuclear techniques were employed for analysis: high-resolution gamma

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23

Shapiro, G. L., S. D. Bulow, K. A. Conklin, L. A. Scheving, and G. M. Gray. "Postinsertional processing of sucrase-alpha-dextrinase precursor to authentic subunits: multiple step cleavage by trypsin." American Journal of Physiology-Gastrointestinal and Liver Physiology 261, no. 5 (1991): G847—G857. http://dx.doi.org/10.1152/ajpgi.1991.261.5.g847.

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Sucrase-alpha-dextrinase, a hybrid digestive carbohydrase of the intestinal brush border, is initially synthesized and transported to the surface membrane as a single-chain glycoprotein, P, which is then cleaved to alpha- and beta-subunits, presumably by one or more pancreatic proteases. However, efforts to convert P under controlled conditions to authentic alpha and beta have been unsuccessful. Sucrase-dextrinase immunoprecipitates from rats intraintestinally labeled with [3H]leucine or [35S]methionine without presence of biliary-pancreatic secretions revealed only the 230-kDa P precursor. Re

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Knot, EA, E. de Jong, JW ten Cate, et al. "Purified radiolabeled antithrombin III metabolism in three families with hereditary AT III deficiency: application of a three-compartment model." Blood 67, no. 1 (1986): 93–98. http://dx.doi.org/10.1182/blood.v67.1.93.93.

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Abstract Purified human radioiodinated antithrombin III (125I-AT III) was used to study its metabolism in six members from three different families with a known hereditary AT III deficiency. Six healthy volunteers served as a control group. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and crossed immunoelectrophoresis (CIE) showed the purified AT III to be homogeneous. Amino acid analysis of the protein revealed a composition identical to a highly purified internal standard. The specific activity was 5.6 U/mg. Analysis of plasma radioactivity data was performed, using a

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Knot, EA, E. de Jong, JW ten Cate, et al. "Purified radiolabeled antithrombin III metabolism in three families with hereditary AT III deficiency: application of a three-compartment model." Blood 67, no. 1 (1986): 93–98. http://dx.doi.org/10.1182/blood.v67.1.93.bloodjournal67193.

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Purified human radioiodinated antithrombin III (125I-AT III) was used to study its metabolism in six members from three different families with a known hereditary AT III deficiency. Six healthy volunteers served as a control group. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and crossed immunoelectrophoresis (CIE) showed the purified AT III to be homogeneous. Amino acid analysis of the protein revealed a composition identical to a highly purified internal standard. The specific activity was 5.6 U/mg. Analysis of plasma radioactivity data was performed, using a three-co

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Liu, Longfei, Zhangang Zhang, Hong Zhang та ін. "Characterization of Surface α-Particle Radiation, Internal Traceability and Simulation of Typical Tin Spheres". Applied Sciences 14, № 10 (2024): 4257. http://dx.doi.org/10.3390/app14104257.

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Surface α-particle emissivity testing and spectral characterization of two leaded tin spheres (Sn10%Pb90%, Sn63%Pb37%) and one lead-free tin sphere (Sn96.5%Ag3.0%Cu0.5%, SAC305) were carried out. The results show that Sn10%Pb90% Sn spheres have the highest α-particle emissivity; Sn63%Pb37% Sn spheres are the next highest, which is an order of magnitude lower than the α-particle emissivity of Sn10%Pb90% Sn spheres; and SAC305 Sn spheres have the lowest emissivity, which is reduced by about 55.6% compared to the emissivity of Sn63%Pb37% Sn spheres. All three types of tin spheres, after purificat

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Mangset, W., E. Ike, F. Masok, S. Mallam, and E. Adetona. "Contour Maps of Gross Alpha and Beta Radioactivity Distribution in Surface Water Supply Within the Naraguta Sheet 168, Plateau State, Nigeria." Journal of Scientific Research and Reports 8, no. 7 (2015): 1–13. http://dx.doi.org/10.9734/jsrr/2015/18932.

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Hamed, Younes, Yosra Ayadi, Rihab Hadji, Amina Ben Saad, Matteo Gentilucci, and Elimame Elaloui. "Environmental Radioactivity, Ecotoxicology (238U, 232Th and 40K) and Potentially Toxic Elements in Water and Sediments from North Africa Dams." Sustainability 16, no. 2 (2024): 490. http://dx.doi.org/10.3390/su16020490.

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The natural radioactivity of 238U, 232Th and 40K was measured in water and sediment samples collected from Sidi Salem dam (Tunisia) and Aïn Dalia dam (Algeria) in the Tuniso-Algerian transboundary basin. The samples were measured using a TERRA detector of gamma, beta, and alpha rays, and atomic absorption and gamma-ray spectrometry were used to analyze the levels of radionuclides and toxic elements, respectively. Potentially toxic elements (Fe, Pb, Zn, Ni, Cr, Cu and Cd) and associated health risks in surface water and sediment of dams were investigated in this present study. The concentration

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M., J. Hossen, F. Kabir M., Amin A., A. Khatun M., and A. Sattar M. "Background Radiation Observation and Measurement: A Case Study Around HSTU Campus, Dinajpur, By Using a Geiger-Muller (GM) Counter." International Journal of Science and Business 15, no. 1 (2022): 79–86. https://doi.org/10.5281/zenodo.6973189.

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Radiation is the name for energy that travels as electromagnetic waves or particles. According to energy or ionizing power, ionizing radiations might be harmful to people's health. We were interested in radiations with high energy to ionize materials for our work. Overexposure to ionizing radiations like Alpha (α), Beta (β), and Gamma (&upsih;) radiations can result in a variety of malignancies. Different types of radiation sources could be present. The main contributors of radionuclides are <sup>40</sup>K, <sup>226</sup>Ra, <sup>238</sup>U, and <sup>232</sup>Th. Man-made source

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Olanrewaju, A., E. Osarulobe, and G. Avwiri. "Measurements of Gross Alpha and Beta Radioactivity in Surface Soil, Mineral Rock and Consumable Water around Mining Sites in Benue State, Nigeria." Journal of Scientific Research and Reports 18, no. 5 (2018): 1–14. http://dx.doi.org/10.9734/jsrr/2018/39193.

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Mangset, E. W., and P. J. Bulus. "Gross Alpha and Beta Radioactivity in Surface Water and Soil from Lead and Zinc Mining Area and their Radiological Risks in Wase Local Government Area, Plateau State, Nigeria." INTERNATIONAL JOURNAL OF APPLIED SCIENCE AND MATHEMATICAL THEORY 8, no. 2 (2022): 51–62. http://dx.doi.org/10.56201/ijasmt.v8.no2.2022.pg51.62.

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Radionuclides are naturally found throughout all environments. They are present in varying amounts in air, water, plants animals, soil and water. In this study ten (10) water samples and fifteen (15) soil samples from Zinc and Lead mining areas in Kampani Zurak village, Wase LGA of Plateau state were collected using standard methods. The samples were analyzed for gross alpha and beta activities using MPC – 2000-DP. The results obtained showed that the gross alpha activities in water ranged from (0.005 ± 0.004 – 0.456 ± 0.019) Bq/l with a mean value of 0.1059 ± 0.0087 Bq/l while the gross beta

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Li, Ruth Gong, Kim Lindland, Sandra Karen Tonstad, et al. "Improved Formulation of 224Ra-Labeled Calcium Carbonate Microparticles by Surface Layer Encapsulation and Addition of EDTMP." Pharmaceutics 13, no. 5 (2021): 634. http://dx.doi.org/10.3390/pharmaceutics13050634.

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Radium-224-labeled CaCO3 microparticles have been developed to treat peritoneal carcinomatosis. The microparticles function as carriers of 224Ra, facilitating intraperitoneal retention of the alpha-emitting radionuclide. It was necessary to control the size of microparticles in suspension over time and introduce a sterilization process for the clinical use of the radiopharmaceutical. Ethylenediamine tetra(methylene phosphonic acid) (EDTMP) was investigated as a stabilizing additive. The possibility of encapsulating the radiolabeled microparticles with an outer surface layer of CaCO3 for the im

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Silva, L. Sousa, and B. R. S. Pecequilo. "Gross alpha and beta activities in surface, underground and drinking waters of a high natural radioactivity region of central south Bahia state, Brazil." Radioprotection 46, no. 6 (2011): S63—S67. http://dx.doi.org/10.1051/radiopro/20116630s.

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Nanjo, H., H. Adachi, M. Aketa, T. Mizoguchi, T. Nishihara, and T. Terada. "The role of cysteine in the alteration of bovine liver dihydrodiol dehydrogenase 3 activity." Biochemical Journal 310, no. 1 (1995): 101–7. http://dx.doi.org/10.1042/bj3100101.

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Bovine liver NADP(+)-dependent dihydrodiol dehydrogenase (DD3) is extremely sensitive to SH reagents such as N-ethylmaleimide (NEM) and 5,5′-dithiobis(2-nitrobenzoic acid). NEM produced time- and concentration-dependent inactivation of DD3 in a pseudo-first-order reaction manner. This inactivation was prevented by NADP+, 3-acetylpyridine-adenine dinucleotide phosphate, 2′,5′-ADP and 2′-AMP but not by substrates, NAD+, nicotinamide mononucleotide or 5′-ADP.DD3 was absorbed by an affinity column of thiopropyl-Sepharose 6B, but enzyme incubated with both NEM and NADP+ was not. Moreover, one [14C]

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Leikauf, G. D., S. P. Fink, M. L. Miller, J. E. Lockey, and K. E. Driscoll. "Refractory ceramic fibers activate alveolar macrophage eicosanoid and cytokine release." Journal of Applied Physiology 78, no. 1 (1995): 164–71. http://dx.doi.org/10.1152/jappl.1995.78.1.164.

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Refractory ceramic fiber has been developed for industrial processes requiring materials with high thermal and mechanical stability. To evaluate the biological activity of this fiber, rat alveolar macrophages were exposed for < or = 24 h to 0–1,000 micrograms/ml of refractory ceramic fiber, crocidolite asbestos, silica (fibrogenic particles), or titanium dioxide (a nonfibrogenic particle), and eicosanoid, tumor necrosis factor-alpha (TNF), and lactate dehydrogenase release were measured. Particle dimensions were determined by electron microscopy. Radioactivity coeluting with leukotriene B4

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Kheder, Malik Hussain. "Measurement of Radon Concentration Using SSNTD in Bartella Region." Al-Mustansiriyah Journal of Science 29, no. 4 (2019): 110. http://dx.doi.org/10.23851/mjs.v29i4.357.

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The alpha-radioactive inert gas Radon exhalation is associated with presence of Radium and its ultimate precursor uranium in the earth crust. Uranium decay deposits radon in soil, which is harmful on human and environment. The exposure of population to high concentration of alpha radioactivity mainly of Radon for a long period leads to lung cancer. The radon activity concentrations, radium contents, radon exhalation rates in twenty one soil samples collected from Bartella region, were measured using the sealed-can technique based on the CR-39 SSNTDs. In the present paper the estimated values f

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Guagliardi, Ilaria, Tommaso Caloiero, Ernesto Infusino, Giovanni Callegari, and Nicola Ricca. "Environmental Estimation of Radiation Equivalent Dose Rates in Soils and Waters of Northern Calabria (Italy)." Geofluids 2021 (April 27, 2021): 1–8. http://dx.doi.org/10.1155/2021/6617283.

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In this study, the equivalent dose rate of natural radionuclides ( H T ) in 99 spring water and surface soil samples was determined using an alpha, beta, and gamma high sensitivity detector up within a Geiger-Muller tube and with an external probe NaI (Tl). The samples were collected in the Crati basin (southern Italy), and during sample collection, water quality parameters were detected in situ and at the University of Calabria laboratories. A Pearson correlation coefficient analysis was applied to identify and clarify the relationships between water physical-chemical properties and soil and

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Wadhwani, K. C., Q. R. Smith, and S. I. Rapoport. "Facilitated transport of L-phenylalanine across blood-nerve barrier of rat peripheral nerve." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 258, no. 6 (1990): R1436—R1444. http://dx.doi.org/10.1152/ajpregu.1990.258.6.r1436.

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L-Phenylalanine transport across the blood-nerve barrier was studied by perfusing Ringer solution containing trace amounts of L-[14C]phenylalanine and [3H]dextran (a vascular marker) through the hindlimb of an anesthetized rat. At the end of perfusion, a segment of sciatic nerve was removed, frozen, desheathed, and processed for radioactivity counting. The permeability-surface area product of the blood-nerve barrier (PABNB) to L-[14C]phenylalanine decreased from 58 +/- 9 X 10(-5) to 1.7 +/- 0.3 X 10(-5) (SE) ml.s-1.g wet wt-1, as the perfusate concentration of unlabeled L-phenylalanine was inc

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Nawroth, P., D. Handley, G. Matsueda, et al. "Tumor necrosis factor/cachectin-induced intravascular fibrin formation in meth A fibrosarcomas." Journal of Experimental Medicine 168, no. 2 (1988): 637–47. http://dx.doi.org/10.1084/jem.168.2.637.

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Recent studies have indicated that TNF can promote activation of the coagulation mechanism by modulating coagulant properties of endothelial cells. In this report, we demonstrate that infusion of low concentrations of TNF (3 micrograms/animal) into mice bearing meth A fibrosarcomas leads to localized fibrin deposition with formation of occlusive intravascular thrombi in close association with the endothelial cell surface. Studies with 125I-fibrinogen showed tenfold enhanced accumulation of radioactivity in tumor within 2 h after TNF infusion. Western blots of tumor extracts subjected to SDS-PA

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Alene Assefa, Nigus. "Analysis of 226Ra content and 222Rn exhalation rates in soil samples from Wukro, Tigray, using SSNTDs." F1000Research 14 (March 13, 2025): 289. https://doi.org/10.12688/f1000research.160449.1.

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Background Radon gas, a decay product of radium, is a significant environmental health risk due to its radioactive properties. Understanding the radium content and radon exhalation rates in soil is crucial for evaluating potential radiological hazards and ensuring environmental safety. Methods Soil samples were collected from twelve different locations in Wukro, Tigray, representing various soil types. The sealed can technique, using LR-115 Type-II plastic track detectors, was employed to measure radium concentrations and radon exhalation rates over a four-month exposure period. Radon mass exh

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Repin, V. S., K. V. Varfolomeeva, A. M. Biblin, S. A. Zelentsova, K. A. Sednev, and G. V. Arkhangelskaya. "Tritium content in water bodies in regions of peaceful nuclear explosions." Radiatsionnaya Gygiena = Radiation Hygiene 17, no. 3 (2024): 67–78. http://dx.doi.org/10.21514/1998-426x-2024-17-3-67-78.

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Sites of peaceful nuclear explosions pose a potential radiation hazard to the territories of the Russian Federation, primarily due to the possible release of radioactivity from the explosion cavity into aquifers and onto the earth's surface. Therefore, it is essential to conduct regular monitoring of anthropogenic radionuclides in drinking water sources in settlements located near the sites of peaceful nuclear explosions. Tritium serves as an indicator of the potential release of other anthropogenic radionuclides. Monitoring its levels in water bodies in regions where peaceful nuclear explosio

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Miller, Claire E., Jonathan D. Rock, Kristian A. Ridley, Peter H. Williams, and Julian M. Ketley. "Utilization of Lactoferrin-Bound and Transferrin-Bound Iron by Campylobacter jejuni." Journal of Bacteriology 190, no. 6 (2008): 1900–1911. http://dx.doi.org/10.1128/jb.01761-07.

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ABSTRACT Campylobacter jejuni NCTC 11168 was capable of growth to levels comparable with FeSO4 in defined iron-limited medium (minimal essential medium alpha [MEMα]) containing ferrilactoferrin, ferritransferrin, or ferri-ovotransferrin. Iron was internalized in a contact-dependent manner, with 94% of cell-associated radioactivity from either 55Fe-loaded transferrin or lactoferrin associated with the soluble cell fraction. Partitioning the iron source away from bacteria significantly decreased cellular growth. Excess cold transferrin or lactoferrin in cultures containing 55Fe-loaded transferri

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Das, S., A. K. Saha, N. K. Mukhopadhyay, and R. H. Glew. "A cyclic nucleotide-independent protein kinase in Leishmania donovani." Biochemical Journal 240, no. 3 (1986): 641–49. http://dx.doi.org/10.1042/bj2400641.

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Leishmania donovani promastigotes labelled for 2 h with 32Pi incorporated radioactivity into at least 21 different proteins, as determined by SDS/polyacrylamide-gel electrophoresis. Pulse-chase studies with 32Pi demonstrated that the labelled proteins were in a dynamic state: some radiolabelled proteins rapidly disappeared and others appeared after the chase. The possibility of an ectokinase on the parasite was examined; incubation of intact parasites for 10 min at 25 degrees C in an osmotically buffered medium containing [gamma-32P]ATP, but not [alpha-32P]ATP, resulted in the labelling of 10

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Niinobu, T., M. Ogawa, A. Murata, J. Nishijima, and T. Mori. "Identification and characterization of receptors specific for human pancreatic secretory trypsin inhibitor." Journal of Experimental Medicine 172, no. 4 (1990): 1133–42. http://dx.doi.org/10.1084/jem.172.4.1133.

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Specific binding sites for human pancreatic secretory trypsin inhibitor (PSTI) on 3T3 Swiss albino cells were studied using radioiodinated recombinant PSTI. Some ion species, pH, and temperature significantly influenced the binding of 125I-PSTI. Kinetic studies showed that the binding of 125I-PSTI to 3T3 Swiss albino cells reached the maximum level within 120 min at 4 degrees C, with a slow dissociation rate. The half-maximal inhibition (ID50) of 125I-PSTI binding by unlabeled PSTI occurred at 1.0 x 10(-10) M. On Scatchard analysis of the competitive binding data, linear plots indicated a sing

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Collens, Sean, Nicole Robinson, Matt Moran, et al. "Abstract 5041: TEM-1 targeted alpha therapeutic [Ac-225]-FPI-1848 induces regression in pre-clinical sarcoma xenograft models." Cancer Research 83, no. 7_Supplement (2023): 5041. http://dx.doi.org/10.1158/1538-7445.am2023-5041.

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Abstract Background: Tumor endothelial marker 1 (TEM-1 or CD248) is a cell surface receptor belonging to a family of C-type lectin transmembrane proteins. Identified as a fetal antigen, expression peaks during embryogenesis but is minimally detected in adulthood. In pathological conditions TEM-1 has been shown to be overexpressed in cancer and fibrosis. In sarcomas, expression occurs throughout the tumor environment in malignant cells, stromal cells and perivascular cells. The first line of treatment for sarcomas is surgical removal; however, many sarcomas arise in inoperable sites prompting a

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Emproto, Christopher, Austin Alvarez, Christian Anderkin, and John Rakovan. "The Crystallinity of Apatite in Contact with Metamict Pyrochlore from the Silver Crater Mine, ON, Canada." Minerals 10, no. 3 (2020): 244. http://dx.doi.org/10.3390/min10030244.

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The purpose of this work is to evaluate the long-term effects of radiation on the structure of naturally occurring apatite in the hope of assessing its potential for use as a solid nuclear waste form for actinide sequestration over geologically relevant timescales. When a crystal is exposed to radioactivity from unstable constituent atoms undergoing decay, the crystal’s structure may become damaged. Crystalline materials rendered partially or wholly amorphous in this way are deemed “partially metamict” or “metamict” respectively. Intimate proximity of a non-radioactive mineral to a radioactive

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Celada, A., and R. D. Schreiber. "Internalization and degradation of receptor-bound interferon-gamma by murine macrophages. Demonstration of receptor recycling." Journal of Immunology 139, no. 1 (1987): 147–53. http://dx.doi.org/10.4049/jimmunol.139.1.147.

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Abstract Although the interferon-gamma (IFN-gamma) receptor on murine and human mononuclear phagocytes has been defined and partially characterized, very little data exists which describes the ultimate fate of receptor-bound ligand. The current studies were specifically designed to define the metabolic processes which act on murine recombinant IFN-gamma following its interaction with murine macrophages at physiologic temperatures. Ligand internalization was demonstrated by comparing binding of [125I]IFN-gamma to macrophages at 4 degrees C and 37 degrees C. When binding was carried out at 4 deg

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Staak, Jan O., David Colcher, Jianyi Wang, Andreas Engert, and Andrew A. Raubitschek. "Radioimmunotherapy Utilizing the Humanized Anti-CD25 Mab Daclizumab Is Highly Effective in Mice Bearing Human Hodgkin’s Lymphoma Xenografts." Blood 104, no. 11 (2004): 4632. http://dx.doi.org/10.1182/blood.v104.11.4632.4632.

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Abstract Objectives: CD25 is overexpressed on the cell surface by a variety of malignant diseases including Hodgkin’s lymphoma (HL). It is cleaved from the cell surface releasing a soluble ectodomain (sCD25) which may interfere with a radiolabeled MAb’s ability to reach the target cell. Daclizumab (Zenapax®), a humanized IgG1 that binds to the alpha subunit of the human interleukin-2 (IL-2) receptor (CD25, Tac), is FDA-approved for the prophylaxis of renal transplant rejection, as part of an immunosuppressive regimen. We performed biodistribution and γ-imaging studies of 111In-labeled Zenapax

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Vasiliy, Rybachuk, Ruban Olena, Krasnopyorova Alla, and Yuhno Galina. "Studying the influence of the natural zeolite tablets manufacturing technology on sorbtion kinetic of long-living 90Sr and 137Cs radionuclides and Pb2+ and Hg2+ heavy metals from water solution in vitro." ScienceRise: Pharmaceutical Science, no. 2(12) (April 30, 2018): 37–42. https://doi.org/10.15587/2519-4852.2018.128730.

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<strong>Aim:</strong> To study the influence of the technology on the adsorption activity of natural zeolite tablets (clinoptilolite) in relation to long-lived <sup>90</sup>Sr and <sup>137</sup>Cs radionuclides and Pb<sup>2+ </sup>and Hg<sup>2+</sup> heavy metals from an aqueous solution in vitro. <strong>Methods:</strong> Tablets were prepared by direct pressing and pressing with pre-wet granulation (a moisturizer - 7 % starch paste). Sorption capacity of enterosorbents was investigated by the method of static sorption at pH = 2–8 at a temperature of 37 &de

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Ikezoe, Takayuki, Taro Tachibana, Chiaki Hata та ін. "Delivery of α-Particles By a Human-Rat Chimeric CD82 Monoclonal Antibody Potently Inhibits the Proliferation of CD82-Expressing Acute Myeloid Leukemia Cells in a Murine Xenograft Model". Blood 142, Supplement 1 (2023): 2794. http://dx.doi.org/10.1182/blood-2023-174676.

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[Background] We previously found that acute myeloid leukemia (AML) cells aberrantly express CD82, a member of the tetraspanin family, on their surface. Functional analyses of CD82 by either depletion or forced expression of CD82 revealed that CD82 plays a role in the adhesion of AML cells to the bone marrow microenvironment in association with the inhibition of matrix metallopeptidase 9 (IJC 2013). In addition, CD82 transactivates several signaling pathways and upregulates anti-apoptotic Bcl-2L12 molecules in AML cells (Ikezoe T, et al. Int J Cancer. 2014;134:55, PLoS One. 2015;10: e0125017, L

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