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Добірка наукової літератури з теми "THERMO LUMINESCENCE DOSIMETER"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "THERMO LUMINESCENCE DOSIMETER"

Hsieh, Chi Wen, and Yi Hong Lin. "Non-Uniform Dose Measurement Based on Two-Stage Bleaching Integrated with Thermo-Luminescence and Optically Stimulated Luminescence Dosimeter." Advanced Materials Research 744 (August 2013): 474–77. http://dx.doi.org/10.4028/www.scientific.net/amr.744.474.

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Thermo luminescence dosimeter and optically stimulated luminescence dosimeter are the most popular dosimeters for personal and environmental radiation monitoring. Basically, these dosimeters are both accumulated dosimeters so that they cannot precisely measure dynamic doses, i.e. there is no any information of time resolving. We developed an algorithm to solve the problem that can depress the uncertain measurement by using partially bleaching techniques; the two-stage bleaching method under the fixed bleaching intensity condition. To analyze and compare the difference of ionizing radiation dose between two dosimeters can partially recall the non-uniformly distributed radiation doses. The Gaussian distribution of dose is considered for the simulation and the results indicated that error of the dose rate could be depressed to 15% compared to the traditional method.

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Sohan, N. A., M. J. Dewan, A. K. M. M. Rahman, M. Al-Mamun, and M. I. Hosan. "Thermo-luminescence Response of Carbon Nanotubes and Some Other Familiar TL Materials Using Medical LINAC." Journal of Scientific Research 12, no. 4 (September 1, 2020): 455–62. http://dx.doi.org/10.3329/jsr.v12i4.45336.

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Strain and impurity defects in carbon nanotubes (CNTs) particularly their potentiality as a new TL material has been studied over the years. In this research, our main objective is to explore the suitability of using CNTs and its composites in the area of TL dosimeter. For this purpose, a study was carried out between the TL responses of the dosimeters TLD-100, TLD-7000 and NaI-LiF pellets. To carry out this research, equivalent irradiations were performed with these pellets using clinical linear accelerator (LINAC) under 6 MV X-ray photon beam. The dose range was from 0.5 to 5 Gy. During irradiation, the dose rate was kept constant at 300 MU/min. TLD reader was used to readout the samples in a flowing N2 atmosphere to reduce surface oxidation.During readout, pre-heat temperature was set initially at 50 °C, acquired temperature rate 10 °C/s and maximum annealed temperature was 300 °C. Response of TLD-100 under varying dose was typically linear for any doses but other dosimeters TLD-7000 showed supra-linearity beyond 2 Gy and NaI-LiF pellets showed sub-linearity response after 2 Gy. The TL glow peak of CNTs indicated that it was lying somewhere away from 300 °C.

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Omer, Mohammed A. Ali, Abdulrahman A. Alsayyari, Jumaa Y. Tamboul, Rowida B. Ali, Amira A. Ahmed, and Ahmed Abukonna. "Studying of Common Factors Affecting Reading of Lithium Fluoride Thermo-Luminescence Dosimeter Crystal." Open Journal of Biophysics 07, no. 01 (2017): 14–24. http://dx.doi.org/10.4236/ojbiphy.2017.71002.

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Noble, Brooklyn, Dong-Ok Choe, and Tatjana Jevremovic. "Experimental and MCNP5 based evaluation of neutron and gamma flux in the irradiation ports of the University of Utah research reactor." Nuclear Technology and Radiation Protection 27, no. 3 (2012): 222–28. http://dx.doi.org/10.2298/ntrp1203222n.

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Neutron and gamma flux environment of various irradiation ports in the University of Utah training, research, isotope production, general atomics reactor were experimentally assessed and fully modeled using the MCNP5 code. The experimental measurements were based on the cadmium ratio in the irradiation ports of the reactor, flux profiling using nickel wire, and gamma dose measurements using thermo luminescence dosimeter. Full 3-D MCNP5 reactor model was developed to obtain the neutron flux distributions of the entire reactor core and to compare it with the measured flux focusing at the irradiation ports. Integration of all these analysis provided the updated comprehensive neutron-gamma flux maps of the existing irradiation facilities of the University of Utah TRIGA reactor.

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Nurdin, W. B., Aswad, and K. Bariah. "Effect of SSD and absorbing filter in calibration process of Thermo Luminescence Dosimeter TLD-700." Journal of Physics: Conference Series 1341 (October 2019): 082029. http://dx.doi.org/10.1088/1742-6596/1341/8/082029.

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Hegazy, Ehab A. "Comparison Between Thermo Luminescence Dosimeter and Planning System Dose Calculation in The Brain and Spinal Cord Tumour." JOURNAL OF ADVANCES IN PHYSICS 16, no. 1 (August 7, 2019): 272–79. http://dx.doi.org/10.24297/jap.v16i1.8375.

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Radiotherapy of Spinal cord and brain tumor requires High care due to considerable changes in the white matter of the brain, which consequently lead to a reduction of patient learning and mental skills. It is considered a very critical tumor due to high sensitivity of gross volume location and normal tissues surrounding it, including eye, heart, plate thyroid, and testis. XiO planning systems, TLD dosimeter found in Mansoura university oncology department, CMS XIO USA TPS were compared using electron and photon beams with different energies at a different site in target volume and organs at risk. We conclude that regular calibration of planning systems and direct measurement of the dose delivered to main target and organs at risk should be done to avoid the difference between XiO planning systems and direct measurement by TLd.

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Sneha, C., SureshM Pradhan, Kshama Srivastava, and Ratna Pradeep. "Response of CaSO4:Dy based thermo luminescence dosimeter badge to137Cs and60Co radiations and its implications on estimation of personal dose equivalent." Radiation Protection and Environment 39, no. 2 (2016): 91. http://dx.doi.org/10.4103/0972-0464.190392.

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Kurrey, Manmohan Singh, and Bhoopendra Dhar Diwan. "Synthesis and Characterization of Novel ZnO Nanophosphors." Advanced Materials Research 938 (June 2014): 145–48. http://dx.doi.org/10.4028/www.scientific.net/amr.938.145.

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In this paper, the novel ZnO nanophosphors is synthesized by solgel method. The study exposed ZnO nanophosphors samples in Gamma (y) radiation to investigate their thermo-luminescence (TL) intensity as a function of temperature. The thermo-luminescence response has been studied in the dose range 0.291.16 kGy and it is observed that the thermo-luminescence response increases with increase in the dose. Moreover, the TL intensity increases with temperature and attains its maximum value near 200 Cand decreases after this temperature. Keywords: Dosimetry; Thermo-luminescence; Zinc oxide; Nanophosphors.

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Kurrey, Manmohan Singh, and Bhoopendra Dhar Diwan. "Photo-Luminescence Properties of Novel ZnO Nano-Phosphors." Advanced Materials Research 938 (June 2014): 311–15. http://dx.doi.org/10.4028/www.scientific.net/amr.938.311.

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In this paper we have reported excellent luminescence properties of novel nanophosphors synthesized through solgel method with narrow size distribution. The size and morphology of the prepared ZnO nanophosphors has been confirmed through XRD and SEM. We have investigated their photo-luminescence (PL) intensity as a function of wavelength. We have prepared ZnO nanophosphor of size 6 nm. It is observed two different emission peaks near 375 nm in the ultraviolet (UV) and near 525 nm in the visible region. The prepared ZnO nanophosphor has enough potential for optoelectronic applications. Keywords: Dosimetry; Thermo-luminescence; Zinc oxide; Nanophosphors.

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Saroja, R. Ragel Mabel. "ASSESSMENT OF INDOOR RADIATION DOSE RECEIVED BY THE RESIDENTS OF NATURAL HIGH BACKGROUND RADIATION AREAS OF COASTAL VILLAGES OF KANYAKUMARI DISTRICT, TAMIL NADU, INDIA." Green Chemistry & Technology Letters 1, no. 01 (November 1, 2015): 01–05. http://dx.doi.org/10.18510/gctl.2015.111.

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Radiation exposure and effective dose received through two routes of exposure, viz. external and internal, via inhalation, by residents of coastal villages belonging to Natural High Background Radiation Areas (NHBRA) of Kanyakumari District and Tamil Nadu inIndiawere studied. While the indoor gamma radiation levels were monitored using Thermo Luminescent Dosimeters (TLDs), the indoor radon and thoron gas concentrations were measured using twin chamber dosimeters employing Solid State Nuclear Track Detectors (SSNTDs, LR-115-II). The average total annual effective dose was estimated and found to be varied from 2.37 to8.64 mSv.

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Більше джерел

Дисертації з теми "THERMO LUMINESCENCE DOSIMETER"

Petitfils, Aurélie. "Propriétés thermoluminescentes du diamant CVD : applications à la dosimétrie des rayonnements ionisants." Toulouse 3, 2007. http://thesesups.ups-tlse.fr/44/.

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Ce travail souligne l'intérêt du diamant synthétique pour la dosimétrie par thermoluminescence (TL) et plus particulièrement pour la radiothérapie. La première partie de ce travail porte sur les propriétés thermoluminescentes et dosimétriques du diamant polycristallin élaboré par synthèse CVD. Les résultats obtenus montrent que ce matériau est bien adapté pour la dosimétrie médicale par TL. La deuxième partie de ce travail s'intéresse à l'application du diamant CVD en radiothérapie. Des mesures de profils de dose, de rendements en profondeur sous photons et électrons, la cartographie d'un faisceau d'électrons et des mesures en Radiothérapie Conformationnelle avec Modulation d'Intensité ont été réalisées avec nos échantillons et comparées à la réponse d'un détecteur de référence. L'ensemble des résultats obtenus montre tout le potentiel du diamant CVD pour une utilisation comme dosimètre TL dans les zones à forts gradients de dose et pour le contrôle des faisceaux d'accélérateurs de traitement
Remarkable properties of synthetic diamond (human soft tissue equivalence, chemical stability, non-toxicity) make this material suitable for medical application as thermoluminescent dosimeter (TLD). This work highlights the interest of this material as radiotherapy TLD. In the first stage of this work, we looked after thermoluminescent (TL) and dosimetric properties of polycristalline diamond made by Chemically Vapor Deposited (CVD) synthesis. Dosimetric characteristics are satisfactory as TLD for medical application. Luminescence thermal quenching on diamond has been investigated. This phenomenon leads to a decrease of dosimetric TL peak sensitivity when the heating rate increases. The second part of this work analyses the use of synthetic diamond as TLD in radiotherapy. Dose profiles, depth dose distributions and the cartography of an electron beam obtained with our samples are in very good agreement with results from an ionisation chamber. It is clearly shown that CVD) diamond is of interest to check beams of treatment accelerators. The use of these samples in a control of treatment with Intensity Modulated Radiation Therapy underlines good response of synthetic diamond in high dose gradient areas. These results indicate that CVD diamond is a promising material for radiotherapy dosimetry

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SINGH, HARPREET. "STUDY OF THERMO LUMINESCENCE DOSIMETER READER AND GAMMA ATTENUATION IN TLD BADGE." Thesis, 2016. http://dspace.dtu.ac.in:8080/jspui/handle/repository/14772.

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The Semi-Automatic TLD Badge Reader TL1010S is a personnel monitoring system, developed & manufactured by Nucleonix Systems is primarily designed to read the TLD card (TL dosimeters) worn by radiation workers. Several Personnel radiation monitoring systems such as photographic films, pocket ionization chambers and thermoluminescent dosimeters (TLD) have been used for the routine evaluation of radiation exposures to personnel. Recently there has been a rapid increase in the use of TLD for personnel monitoring of radiation workers. This Semi-Automatic TLD Badge Reader is primarily designed to read Bhabha Atomic Research Centre (BARC) developed CaSo4 (D4) PTFE disc dosimeter based TLD cards. These cards utilize three dosimeters. The TLD personnel monitoring system essentially consists of two major parts: TLD badge and TLD badge reader. The TLD Badge comprises of a plastic cassette containing a TLD Card made of aluminum with three Teflon TLD discs (13.3mm and 0.8mm thick) that are mechanically clipped on to circular holes (12.0mm) punched on it (52 x 30 x 1mm). Each TLD Card also comprises of a unique punched hole ID which is readout during the acquisition cycle for identifying the wearer of the TLD. The TLD Badge Reader is designed to measure X, Gamma and Beta radiation dose. The metal filter combination (1mm Al + 0.9mm Cu) is provided to reduce the photon energy dependence of the TL discs. The TL badge reader is calibrated such that the TL output of the disc under the metallic filter reads directly the gamma radiation dose. The radiation workers wear the dosimeter & the radiation exposure is estimated on the basis of TL dosimetric reading. Thermoluminescent dosimeters make use of the property of certain materials, which absorb energy when exposed to X, Gamma or Beta radiation. On heating, the absorbed energy is released in the form of visible light. A plot of light intensity emitted against temperature is known as a glow curve.

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Частини книг з теми "THERMO LUMINESCENCE DOSIMETER"

Mehare, C. M., A. S. Nakhate, S. J. Dhoble, and K. V. Dabre. "Vanadate and tungstate based phosphors for thermo luminescence dosimetry." In Phosphor Handbook, 371–91. Elsevier, 2023. http://dx.doi.org/10.1016/b978-0-323-90539-8.00004-8.

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Тези доповідей конференцій з теми "THERMO LUMINESCENCE DOSIMETER"

Manfred, M. E., N. T. Gabriel, M. L. Mah, E. G. Yukihara, and J. J. Talghader. "Pulsed thermal excitation of luminescent microparticles for radiation dosimetry." In 2008 IEEE/LEOS Internationall Conference on Optical MEMs and Nanophotonics. IEEE, 2008. http://dx.doi.org/10.1109/omems.2008.4607830.

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