Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations

In this paper, we report the prediction of thermoluminescence responses of Neodymium-doped SiO₂ optical fibre with various dose ranges from 0.5 Gy to 4.0 Gy by 6MeV - electron irradiations without requirement for experimental measurements. A technique has been developed to calculate prediction of 6M...

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Datum:	2015
Hauptverfasser:	Hossain, I., Saeed, M.A., Wagiran, H., Hida, N., Yaakob, N.H., Moburak, A.A.
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Sprache:	English
Veröffentlicht:	Національний науковий центр «Харківський фізико-технічний інститут» НАН України 2015
Schriftenreihe:	Вопросы атомной науки и техники
Schlagworte:	Ядерно-физические методы и обработка данных
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Zitieren:	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations / I. Hossain, M.A. Saeed, H.Wagiran, N. Hida, N.H. Yaakob, A A.Moburak // Вопросы атомной науки и техники. — 2015. — № 3. — С. 65-68. — Бібліогр.: 10 назв. — англ.

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spelling	irk-123456789-1121222017-01-18T03:03:42Z Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations Hossain, I. Saeed, M.A. Wagiran, H. Hida, N. Yaakob, N.H. Moburak, A.A. Ядерно-физические методы и обработка данных In this paper, we report the prediction of thermoluminescence responses of Neodymium-doped SiO₂ optical fibre with various dose ranges from 0.5 Gy to 4.0 Gy by 6MeV - electron irradiations without requirement for experimental measurements. A technique has been developed to calculate prediction of 6MeV - electron response of Neodymium-doped SiO₂ optical fibre by observing the measured TL response of 6MV - photon and the ratio of known measured photon/electron yield ratio distribution for Ge-doped, Al-doped optical fibre and standard TLD 100 dosimeter. The samples were kept in gelatin capsule an irradiated with 6MV - photon at the dose range from 0.5 Gy to 4.0 Gy. Siemens model Primus 3368 linear accelerator located at Hospital Sultan Ismail, Johor Bahru has been used to deliver the photon beam to the samples. We found the average response ratio of 6MV - photon and 6MeV - electron in Ge-doped, Al-doped optical fibre and standard TLD-100 dosimeter are 0.83(3). Observing the measured value of 6MV - photon irradiation this average ratio is useful to find the prediction of thermoluminescence responses by 6MeV - electron irradiation of Neodymium-doped SiO₂ optical fibre by the requirement for experimental measurements with various dose ranges from 0.5 Gy to 4.0 Gy by 6MV - photon irradiations. Ми доповідаемо передбачення термолюмінесцентного відгука SiO₂ оптичного волокна з добавками неодиму при різних дозах опромінення 6 МеВ-електронами в інтервалі доз від 0.5 Gy до 0.4 Gy без необхідності експериментальної перевірки. Була развинута техніка розрахунку передбачення термолюмінесцентного вігука SiO₂ оптичного волокна на 6 МеВ-електрони шляхом спостереження термолюмінесцентного відгука на 6 МВ-фотони і відомогого виміряного відношення photon/electron виходів оптичного волокна з добавками Ge і Al та стандартного TLD 100 дозимента. Зразки були розміщені в желатинових капсулах і опромінені 6 МВ-фотонами в діапазоні доз від 0.5 Gy до 0.4 Gy. Лінійний прискорювач моделі Siemens Primus 3368, розміщений в Hospital Sultan Ismail, Johor Bahru був викорисаний для опрмінення зразків фотонами. Ми знайшли середнє відношення відгуків для 6 МВ-фотонів и 6 МеВ-електронів в оптичному волокні з добавками Ge і Al та стандартним дозиметром TLD 100 , яке дорівнює 0.83(3). Виміряна величина цього усередненого відношения при опроміненні 6 МВ-фотонами є корисною для знаходждення очікуваного термолюмінесцентного відгука SiO₂ оптичного волокна з добавками неодиму, які потрібні для экспериментальних вимірювань доз в інтервалі від 0.5 Gy до 0.4 Gy при опроміненні 6 МеВ-електронами. Мы докладываем предсказания термолюминесцентного отклика SiO₂ оптического волокна с добавлением неодима при разных дозах облучения 6 МэВ-электронами в интервале доз от 0.5 Gy до 0.4 Gy без необходимости экспериментальной проверки. Была развита техника расчета предсказания термолюминесцентного отклика SiO₂ оптического волокна на 6 МэВ-электроны путем наблюдения термолюминесцентного отклика на 6 МВ -фотоны и известного измеренного отношения photon/electron выходов оптического волокна с добавлением Ge и Al и стандартного TLD 100 дозимента. Образцы были заключены в желатиновые капсулы и облучены 6 МВ-фотонами в диапазоне доз от 0.5 Gy до 0.4 Gy. Линейный ускоритель модели Siemens Primus 3368, расположенный в Hospital Sultan Ismail, Johor Bahru был использован для облучения образцов фотонами. Мы нашли среднее отношение откликов для 6 МВ-фотонов и 6 МэВ-электронов в оптическом волокне с добавлением Ge и Al и стандартным дозиметром TLD 100 равным 0.83(3). Измеренная величина этого усредненного отношения при облучении 6 МВ-фотонами является полезной для нахождения ожидаемого термолюминесцентного отклика SiO₂ оптического волокна с добавлением неодима требуемых для экспериментальных измерений доз в интервале от 0.5 Gy до 0.4 Gy при облучении 6 МэВ-электронами. 2015 Article Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations / I. Hossain, M.A. Saeed, H.Wagiran, N. Hida, N.H. Yaakob, A A.Moburak // Вопросы атомной науки и техники. — 2015. — № 3. — С. 65-68. — Бібліогр.: 10 назв. — англ. 1562-6016 PACS: 03.65.Pm, 03.65.Ge, 61.80.Mk http://dspace.nbuv.gov.ua/handle/123456789/112122 en Вопросы атомной науки и техники Національний науковий центр «Харківський фізико-технічний інститут» НАН України
institution	Digital Library of Periodicals of National Academy of Sciences of Ukraine
collection	DSpace DC
language	English
topic	Ядерно-физические методы и обработка данных Ядерно-физические методы и обработка данных
spellingShingle	Ядерно-физические методы и обработка данных Ядерно-физические методы и обработка данных Hossain, I. Saeed, M.A. Wagiran, H. Hida, N. Yaakob, N.H. Moburak, A.A. Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations Вопросы атомной науки и техники
description	In this paper, we report the prediction of thermoluminescence responses of Neodymium-doped SiO₂ optical fibre with various dose ranges from 0.5 Gy to 4.0 Gy by 6MeV - electron irradiations without requirement for experimental measurements. A technique has been developed to calculate prediction of 6MeV - electron response of Neodymium-doped SiO₂ optical fibre by observing the measured TL response of 6MV - photon and the ratio of known measured photon/electron yield ratio distribution for Ge-doped, Al-doped optical fibre and standard TLD 100 dosimeter. The samples were kept in gelatin capsule an irradiated with 6MV - photon at the dose range from 0.5 Gy to 4.0 Gy. Siemens model Primus 3368 linear accelerator located at Hospital Sultan Ismail, Johor Bahru has been used to deliver the photon beam to the samples. We found the average response ratio of 6MV - photon and 6MeV - electron in Ge-doped, Al-doped optical fibre and standard TLD-100 dosimeter are 0.83(3). Observing the measured value of 6MV - photon irradiation this average ratio is useful to find the prediction of thermoluminescence responses by 6MeV - electron irradiation of Neodymium-doped SiO₂ optical fibre by the requirement for experimental measurements with various dose ranges from 0.5 Gy to 4.0 Gy by 6MV - photon irradiations.
format	Article
author	Hossain, I. Saeed, M.A. Wagiran, H. Hida, N. Yaakob, N.H. Moburak, A.A.
author_facet	Hossain, I. Saeed, M.A. Wagiran, H. Hida, N. Yaakob, N.H. Moburak, A.A.
author_sort	Hossain, I.
title	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations
title_short	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations
title_full	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations
title_fullStr	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations
title_full_unstemmed	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations
title_sort	thermoluminescence response of ge-, al- and nd-doped optical fibers by 6 mev - electron and 6 mv - photon irradiations
publisher	Національний науковий центр «Харківський фізико-технічний інститут» НАН України
publishDate	2015
topic_facet	Ядерно-физические методы и обработка данных
url	http://dspace.nbuv.gov.ua/handle/123456789/112122
citation_txt	Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations / I. Hossain, M.A. Saeed, H.Wagiran, N. Hida, N.H. Yaakob, A A.Moburak // Вопросы атомной науки и техники. — 2015. — № 3. — С. 65-68. — Бібліогр.: 10 назв. — англ.
series	Вопросы атомной науки и техники
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fulltext	THERMOLUMINESCENCE RESPONSE OF Ge-, Al- AND Nd- DOPED OPTICAL FIBERS BY 6MeV - ELECTRON AND 6MV - PHOTON IRRADIATIONS I.Hossain2∗, M.A.Saeed1, H.Wagiran1, N.Hida1, N.H.Yaakob1, A.A.Moburak2 1Department of Physics, Universiti Teknologi Malaysia, 81310, Skudai, Johor Darul Takzim, Malaysia; 2Department of Physics, Rabigh College of Science and arts, King Abdulaziz University, Post Box 344, Rabigh 21911, Saudi Arabia (Received August 28, 2014) In this paper, we report the prediction of thermoluminescence responses of Neodymium-doped SiO2 optical fibre with various dose ranges from 0.5Gy to 4.0Gy by 6MeV - electron irradiations without requirement for experimental measurements. A technique has been developed to calculate prediction of 6MeV - electron response of Neodymium- doped SiO2 optical fibre by observing the measured TL response of 6MV - photon and the ratio of known measured photon/electron yield ratio distribution for Ge-doped, Al-doped optical fibre and standard TLD 100 dosimeter. The samples were kept in gelatin capsule an irradiated with 6MV - photon at the dose range from 0.5Gy to 4.0Gy. Siemens model Primus 3368 linear accelerator located at Hospital Sultan Ismail, Johor Bahru has been used to deliver the photon beam to the samples. We found the average response ratio of 6MV - photon and 6MeV - electron in Ge-doped, Al-doped optical fibre and standard TLD−100 dosimeter are 0.83(3). Observing the measured value of 6MV - photon irradiation this average ratio is useful to find the prediction of thermoluminescence responses by 6MeV - electron irradiation of Neodymium-doped SiO2 optical fibre by the requirement for experimental measurements with various dose ranges from 0.5Gy to 4.0Gy by 6MV - photon irradiations. PACS: 03.65.Pm, 03.65.Ge, 61.80.Mk 1. INTRODUCTION The study of the thermoluminescence (TL) response of optical fibres to ionizing photon and electron ra- diation is of great practical importance for dosimet- ric applications [1, 2] because it has TLD phosphor whose atomic properties are almost equal to atomic properties of the human tissues. In regard to the TL response of doped SiO2 optical fibres, such ma- terials have attracted attention due to their possible application as radiation dosimeters, as they offer a higher chemical stability and a relatively lower effec- tive atomic number than for instance films. The pres- ence of impurities or the addition of dopants to SiO2 can greatly enhance the sensitivity of the medium to ionizing radiation and indeed even to ultraviolet ra- diation by providing an increased number of traps. In addition, new defects and absorption bands are formed [3]. Recently, we have started to use doped SiO2 opti- cal fibers as a radiation dosimeter in order to measure absorbed doses in radiotherapy patients, seeking to overcome a number of limitations of existing dosime- try system [1, 4-7]. These TLDs are also impervious to water to the extent that in some instances it be- comes possible to locate the fiber dosimeter within a particular tissue of interest [8-10]. These optical fibers are also able to maintain a consistent TL re- sponse after repeated exposures. The SiO2 commer- cial optical fiber demonstrates useful TL properties and is an excellent candidate for use in TL dosimetry of ionizing radiation. Based on the previous studies, this study is very important to find the prediction of TL response of commercially Nd − 107 doped silica fiber by 6MeV electron irradiations. This material is irradiated at doses from (0.5...4.0)Gy using photons of 6MV energy to measure the TL response. 2. MATERIAL AND METHODS 2.1. Nd-doped SiO2 optical fibres Silicon dioxide, also known as silica, is an amorphous material, devoid of long-range periodic order. In the current research, we focus on the TL response of doped SiO2 commercially available optical fibre. The doped SiO2 optical fibres have an outer diameter of 124.7 ± 0.1µm and a doped core diameter of 9µm. In fibre optics, doping with selected atoms permits ∗Corresponding author E-mail address: mihossain@kau.edu.sa ISSN 1562-6016. PROBLEMS OF ATOMIC SCIENCE AND TECHNOLOGY, 2015, N3(97). Series: Nuclear Physics Investigations (64), p.65-68. 65 the creation of a refractive index radial profile that leads to total internal reflection. This is essential for an optical guide [1]. In this study, neodymium has been chosen due to their high sensitivity exhibition to irradiations and has low attenuation. We cut the fibres into individual lengths of 5mm and accommo- dated the variations in actual length by normalizing the TL response to unit mass of the TL medium. The details of Ge-doped and Al-doped optical fibre and TLD − 100 were presented [1]. 3. EXPERIMENTAL PROCEDURE For this experiment, the TL materials were kept in a suitable container to avoid the places of high tem- perature and ultraviolet radiation. The Nd − 107 doped fiber and TLD−100 were placed in the gelatin capsule for routine storage, handling, and for irradi- ations. Each capsule contained 5 pieces of Nd− 107 doped fiber, each capsule contained 1 chip. The ex- perimental details was presented [4, 5]. In annealing, the TL materials were put in a furnace. The furnace was connected to a computer and Thermosoft soft- ware was used to control the process in the furnace. Before starting the annealing process, Time Temper- ature Profile (TTP ) for Nd− 107 doped silica fibers were set at the computer and fibers were placed in a planchet which was placed inside the annealing oven. Samples were exposed to 6MV - photon by using Siemens model Primus 3368 linear acceler- ator located in the Department of Radiotherapy and Oncology, Hospital Sultan Ismail, Johor Bahru, Malaysia. The dose delivered by the LINAC machine was 20...400MU (monitor unit) with a field size of 10 cm×10 cm. By using TLD Reader and WinREMS software, readings were obtained after irradiation. In this research, Harshaw 3500TLD Reader with hot nitrogen gas as a heat transfer medium was used. Pre-heat temperature was 50◦C and the maximum temperature during data acquisition was 300◦C. To acquire temperature, the rate was 10◦C per second. 4. RESULTS AND DISCUSSION Thermoluminescence sensitivity is a measure of the amount of TL signal per unit mass produced by a given material after exposure to a radiation dose. The effects of TL light yield proportionality to dose and by establishing the ability to accurately calcu- late electron response, the experimental implications of dosimeter TL yield proportionality to dose can be studied without the requirement for experimental measurements. This technique also provides a more detailed characterization of electron response than experimental techniques that rely on the use of multi- ple radiation sources. To demonstrate this technique, we have calculated the ratio of measured response of Ge-doped, Al-doped optical fibre and TLD− 100 by 6MV - photon and 6MeV - electron irradiation [4]. Fig.1 shows comparative studies of TL response of Ge-doped, Al-doped optical fibre and TLD − 100 with various dose ranges from 0.2Gy to 4.0Gy by 6MV - photon and 6MeV - electron irradiation. The TL yield as a function of dose is linear; the response for electron irradiations in each case is greater than that for photon irradiations. The re- sponse of Al-doped optical fibre is negligible to TLD − 100 and distribution of photon and elec- tron response as a function of dose is overlap to each other for Al-doped fibre. We have calculated aver- age ratios of response of 6MV - photon and 6MeV - electron irradiation numerically and were found 0.81(3), 0.85(2) and 0.84(3) for TLD − 100, Ge- doped and Al-doped optical fibre respectively. There- fore the average of response ratios of 6MV photon and 6MeV - electron for any dosimeter is 0.83(3). We found that the Nd − 107 doped optical fibre have a significant linear dose to signal relationship. 0 1 2 3 4 0 100 200 300 400 500 600 700 Ge-doped fibre (6 MV photon) Ge-doped fibre (6MeV electron) Al-doped fibre (6 MV photon) Al-doped fibre (6 MeV electron) TLD-100 (6 MV Photon) TLD-100 (6 MeV electron) T L re rs p o n se (n C /m g ) Dose (Gy) Fig.1. TL-response (nC/mg) of Ge-and Al-doped optical fibres, and TLD − 100 rods for 6MV - photon and 6MeV - electron irradiation Fig.2 shows comparative studies of TL re- sponse (arbitrary unit) of Neodymium-doped SiO2 optical fibre with various dose ranges from 0.5Gy to 4.0Gy predicted by 6MeV - electrons and measured by 6MV - photon irradiations. 0 1 2 3 4 0 100 200 300 400 500 6 MV photon (measured)) 6 MeV electron (predicted value) R e la tiv e re sp o n se (a rb itr a ry u n it) Dose (Gy) Fig.2. Relative response of Nd-doped optical fibre by 6MV - photon (measured) and 6MeV - electrons (predicted) irradiation By comparing previous results of TLD − 100, Ge- doped and Al-doped optical fibre to both measured 66 photon and electron responses and measured value of Nd-doped optical fibre by photon responses, this technique has been validated for 6MeV - electron irradiation. 5. CONCLUSIONS We have demonstrated TL linearity and TL response ratio of 6MV - photon/ 6MeV - electron irradiation for Ge-and Al-doped optical fibres, and TLD − 100. The average response ratio is 0.83(3). The sensitivi- ties of electron response are larger than those of pho- ton irradiation. We have predicted the TL response of Nd − 107 doped silica fibers by 6MeV - electron comparer to measured value by 6MV - photon irra- diated with dose range from 0.5Gy to 4.0Gy. ACKNOWLEDGEMENTS The authors thanks to king Abdulaziz University to support this work. The authors would like to thanks for the fi- nancial support of Ministry of Higher Education (MOHE) Malaysia/Universiti Teknologi Malaysia (UTM) for this research work through grant no. Q.J130000.2526.02H93/Q.J13000.7126.00J66/FAVF Vote No.4D035 and Department of Radiotherapy and Oncology, Hospital Sultan Ismail, Johor Bahru for irradiation permission. References 1. N.H.Yaakob, H.Wagiran, I. Hossain, A.T.Ramli, D.A.Bradley, S.Hashim, and H.Ali // Nucl. Instr. and Meth. Phys. Res. 2011, v.A637, p.185. 2. N.H.Yaakob, H.Wagiran, I. Hossain, A.T.Ramli, D.A.Bradley, S.Hashim, H.Ali // J. Nucl. Sci. and Tech. 2011, v.48(7), p.1115. 3. L. Juan, Z.C.T.Qiang, H. Jingquan, Z.Yanli, S.Qiang, W. Shubin // Journal of Rare Earths. 2008, v.26, p.203. 4. H.Wagiran, I. Hossain, D.Bradley, N.H.Yaakob, A.T.Ramli // Chin. Phys. Lett. 2012, v.29(2), p.027802. 5. M.A. Saeed, N.A. Fauzia, I. Hossain, A.T.Ramli, B.A.Tahir // Chin. Phys. Lett. 2012, v.29(7), p.078701. 6. S.Hashim, S.Al-Ahbabi, D.A.Bradley, M.Webb, C. Jeynes, A.T.Ramli, H.Wagiran // Appl. Radiat. Isot. 2009, v.67, p.423. 7. Y.A.Abdulla, Y.M.Amin, H.B.Khoo // J.Radiol Prot. 2012, v.22(4), p.417. 8. A.T.Ramli, D.A.Bradley, S.Hashim, H.Wagiran // Appl. Radiat. Isot. 2009, v.67(3), p.428. 9. A. L.Yusoff, R. P.Hugtenburg, D.A.Bradley // Rad. Phys. Chem. 2005, v.74, p.459. 10. G.Espinosa, J. I. Golzarri, J. Bogard, J.Garcia- Macedo // J. Radiat Prot. Dosimetry. 2006, v.119(1-4), p.197. ÒÅÐÌÎËÞÌÈÍÅÑÖÅÍÒÍÛÉ ÎÒÊËÈÊ ÎÏÒÈ×ÅÑÊÎÃÎ ÂÎËÎÊÍÀ Ñ ÄÎÁÀÂËÅÍÈÅÌ Ge-, Al- È Nd ÍÀ ÎÁËÓ×ÅÍÈÅ 6ÌýÂ - ÝËÅÊÒÐÎÍÀÌÈ È 6ÌÂ - ÔÎÒÎÍÀÌÈ I.Hossain, M.A.Saeed, H.Wagiran, N.Hida, N.H.Yaakob, A.A.Moburak Ìû äîêëàäûâàåì ïðåäñêàçàíèÿ òåðìîëþìèíåñöåíòíîãî îòêëèêà SiO2 îïòè÷åñêîãî âîëîêíà ñ äîáàâëå- íèåì Íåîäèìà ïðè ðàçíûõ äîçàõ îáëó÷åíèÿ 6ÌýÂ - ýëåêòðîíàìè â èíòåðâàëå äîç îò 0.5Gy äî 4.0Gy áåç íåîáõîäèìîñòè ýêñïåðèìåíòàëüíîé ïðîâåðêè. Áûëà ðàçâèòà òåõíèêà ðàñ÷åòà ïðåäñêàçàíèÿ òåðìî- ëþìèíåñöåíòíîãî îòêëèêà SiO2 îïòè÷åñêîãî âîëîêíà íà 6ÌýÂ - ýëåêòðîíû ïóòåì íàáëþäåíèÿ òåð- ìîëþìèíåñöåíòíîãî îòêëèêà íà 6ÌÂ - ôîòîíû è èçâåñòíîãî èçìåðåííîãî îòíîøåíèÿ photon/electron âûõîäîâ îïòè÷åñêîãî âîëîêíà ñ äîáàâëåíèåì Ge è Al è ñòàíäàðòíîãî TLD − 100 äîçèìåòðà. Îáðàçöû áûëè çàêëþ÷åíû â æåëàòèíîâûå êàïñóëû è îáëó÷åíû 6MB ôîòîíàìè â äèàïàçîíå äîç îò 0.5Gy äî 4.0Gy. Ëèíåéíûé óñêîðèòåëü ìîäåëè Siemens Primus 3368, ðàñïîëîæåííûé â Hospital Sultan Ismail, Johor Bahru, áûë èñïîëüçîâàí äëÿ îáëó÷åíèÿ îáðàçöîâ ôîòîíàìè. Ìû íàøëè ñðåäíåå îòíîøåíèå îò- êëèêîâ äëÿ 6ÌÂ - ôîòîíîâ è 6ÌýÂ - ýëåêòðîíîâ â îïòè÷åñêîì âîëîêíå ñ äîáàâëåíèåì Ge è Al è ñòàí- äàðòíûì äîçèìåòðîì TLD−100, ðàâíûì 0.83(3). Èçìåðåííàÿ âåëè÷èíà ýòîãî óñðåäíåííîãî îòíîøåíèÿ ïðè îáëó÷åíèè 6ÌÂ ôîòîíàìè ÿâëÿåòñÿ ïîëåçíîé äëÿ íàõîæäåíèÿ îæèäàåìîãî òåðìîëþìèíåñöåíò- íîãî îòêëèêà SiO2 îïòè÷åñêîãî âîëîêíà ñ äîáàâëåíèåì Íåîäèìà òðåáóåìûõ äëÿ ýêñïåðèìåíòàëüíûõ èçìåðåíèé äîç â èíòåðâàëå îò 0.5Gy äî 4.0Gy ïðè îáëó÷åíèè 6ÌýÂ - ýëåêòðîíàìè. 67 ÒÅÐÌÎËÞÌIÍÅÑÖÅÍÒÍÈÉ ÂIÄÃÓÊ ÎÏÒÈ×ÍÎÃÎ ÂÎËÎÊÍÀ Ç ÄÎÁÀÂÊÀÌÈ Ge-, Al- I Nd ÍÀ ÎÏÐÎÌIÍÅÍÍß 6ÌåÂ - ÅËÅÊÒÐÎÍÀÌÈ I 6ÌÂ - ÔÎÒÎÍÀÌÈ I.Hossain, M.A.Saeed, H.Wagiran, N.Hida, N.H.Yaakob, A.A.Moburak Ìè äîïîâiäàåìî ïåðåäáà÷åííÿ òåðìîëþìiíåñöåíòíîãî âiäãóêó SiO2 îïòè÷íîãî âîëîêíà ç äîáàâêàìè íåîäèìó ïðè ðiçíèõ äîçàõ îïðîìiíåííÿ 6ÌåÂ - åëåêòðîíàìè â iíòåðâàëi äîç âiä 0.5Gy äî 4.0Gy áåç íåîáõiäíîñòi åêñïåðèìåíòàëüíî¨ ïåðåâiðêè. Áóëà ðàçâèíóòà òåõíiêà ðîçðàõóíêó ïåðåäáà÷åííÿ òåðìîëþ- ìiíåñöåíòíîãî âiäãóêó SiO2 îïòè÷íîãî âîëîêíà íà 6ÌåÂ - åëåêòðîíè øëÿõîì ñïîñòåðåæåííÿ òåðìî- ëþìiíiñöåíòíãî âiäãóêó íà 6ÌÂ - ôîòîíè i âiäîìîãîãî âèìiðÿíîãî âiäíîøåííÿ photon/electron âèõîäiâ îïòè÷íîãî âîëîêíà ç äîáàâêàìè Ge è Al i ñòàíäàðòíîãî TLD − 100 äîçèìåòðà. Çðàçêè áóëè ðîçìiùåíi â æåëàòèíîâèõ êàïñóëàõ i îïðîìiíåíi 6ÌÂ - ôîòîíàìè â äiàïàçîíi äîç âiä 0.5Gy äî 4.0Gy. Ëiíiéíèé ïðèñêîðþâà÷ ìîäåëi Siemens Primus 3368, ðîçìiùåíèé â Hospital Sultan Ismail, Johor Bahru, áóâ âè- êîðèñòàíèé äëÿ îïðîìiíåííÿ çðàçêiâ ôîòîíàìè. Ìè çíàéøëè ñåðåäí¹ âiäíîøåííÿ âiäãóêiâ äëÿ 6ÌÂ - ôîòîíiâ è 6ÌåÂ - åëåêòðîíiâ â îïòè÷íîìó âîëîêíi ç äîáàâêàìè Ge è Al i ñòàíäàðòíèì äîçèìåòðîì TLD − 100, ÿêå äîðiâíþ¹ 0.83(3). Âèìiðÿíà âåëè÷èíà öüîãî óñåðåäíåíîãî âiäíîøåíèÿ ïðè îïðîìiíåííi 6ÌÂ - ôîòîíàìè ¹ êîðèñíîþ äëÿ çíàõîäæåííÿ î÷iêóâàíîãî òåðìîëþìiíåñöåíòíîãî âiäãóêó SiO2 îï- òè÷íîãî âîëîêíà ç äîáàâêàìè íåîäèìó, ÿêi ïîòðiáíi äëÿ åêñïåðèìåíòàëüíèõ âèìiðþâàíü äîç â iíòåðâàëi âiä 0.5Gy äî 4.0Gy ïðè îïðîìiíåííi 6ÌåÂ - åëåêòðîíàìè. 68

Thermoluminescence response of Ge-, Al- and Nd-doped optical fibers by 6 MeV - electron and 6 MV - photon irradiations

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