研究生: |
吳東曄 Wu, Tung-Yeh |
---|---|
論文名稱: |
光刺激發光指環劑量計之劑量演算法研究 Dose algorithm of the finger ring using optically stimulated luminescent dosimeter |
指導教授: |
許靖涵
Hsu, Ching-Han 許芳裕 Hsu, Fang-Yuh |
口試委員: |
蔡惠予
Tsai, Hui-Yu 游澄清 Yu, CC |
學位類別: |
碩士 Master |
系所名稱: |
原子科學院 - 生醫工程與環境科學系 Department of Biomedical Engineering and Environmental Sciences |
論文出版年: | 2012 |
畢業學年度: | 100 |
語文別: | 中文 |
論文頁數: | 69 |
中文關鍵詞: | 光刺激發光劑量計 、熱發光劑量計 、指環劑量計 、劑量演算法 、能量依存性 、角度依存性 |
外文關鍵詞: | OSLD, TLD, Ring dosimeter, Dose algorithm, Energy dependence, Angular dependence |
相關次數: | 點閱:1 下載:0 |
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光刺激發光劑量計(OSLD)將逐漸取代熱發光劑量計(TLD),可望成為人員劑量計的主流,然而相較於國外的熱潮,國內不論在OSLD的基礎研究或相關應用上都尚在起步階段。本研究提出一套以蒙地卡羅模擬法為基礎的光刺激發光指環劑量計(OSLRD)之劑量演算法,用於解決OSLD之能量依存性所造成的劑量誤判。本演算法亦提出了三種不同角度(0度、30度、60度)為主的劑量修正模式,以降低角度依存性造成的劑量誤差。
本劑量演算法經過核能研究所國家標準實驗室之不同光子能量輻射源的測試驗證,確認本演算法確實可修正能量依存性造成的劑量誤判,整體的劑量誤差約在-11.7至24.5 %。目前國內人員體外劑量評估之認證標準要求為劑量誤差需在±40 %內,本演算法之結果已符合認證要求。
Optically simulated luminescent dosimeter, OSLD, will take place thermo luminescent dosimeter, TLD, to become the main personal dosimeter. Contrast to international world, the basic OSLD researches and applications in Taiwan are still in the starting-up stage. This study developed a Monte Carlo based dose algorithm for optically simulated luminescent ring dosimeter, OSLRD, to solve the miss-estimated dose value due to energy dependence. This algorithm proposed three models dominated by three angles, such as 0, 30, 60 degree, to modify the error due to angular dependence. The dose algorithm developed in this study had passed the verification performed by the National Standard Laboratory, Institute of Nuclear Energy Research, INER. It was recognized that this algorithm can be used to modify the miss-estimated dose due to energy dependence of OSLD. The overall dose errors in the verification were in the range of -11.7 % to 24.5 %. These results meet the requirements (dose error within ±40 %) of Taiwan Accreditation Foundation, TAF, in the test area of externally personal dose estimation.
參考文獻
1.人員輻射劑量評定機構認可及管理辦法-中華民國法規。
2.許彬杰,翁寶山編著,實用固體熱發光劑量計測定數。合計出版社,2000。
3.Corporation, CT. New RPL glass dosemeter system for large scale personal monitoring, 2001.
4.Antonov-Romanovskii VV, Kcium-Marcus IF, Poroshina MS, et al. Conference of the Academy of Sciences if the USSR on the Peaceful Uses of Atomic Energy, Moscow. USAEC Report AEC-tr-2435 (Pt.1):239, 1955.
5.Huntley DJ, Godfrey-Smith DI and Thewalt MLW. Optical dating of sediments Nature, 313, 105–7, 1985.
6.Rhodes.EJ. Methodological considerations in the optical dating of quartz, Quart. Sci. Rev. 7, 359–400, 1988.
7.Smith BW. Optical dating of sediments: initial results from Oxford, Archaeometry 32, 19–31 , 1990.
8.Akselrod MS, Kortov VS, Kravetsky DJ, et al. Highly sensitive thermoluminescent anion-defect α-Al2O3:C single crystal detectors Radiat. Prot. Dosim. 33 119–22, 1990.
9.Akselrod MS, and McKeever SWS. A radiation dosimetrymethod using pulsed optically stimulated luminescence. Radiat. Prot. Dosim. 81 167–76 , 1999.
10.http://www.osldosimetry.com/introduction (accessed on 3 July 2012).
11.McKeever SWS. Optically stimulated luminescence dosimetry Nucl. Instrum. Methods Phys. Res. B 184 29–54, 2001.
12.Gaza R, McKeever SWS, Akselrod MS,et al. A fiber-dosimetry method based on OSL from Al2O3:C for radiotherapy applications Radiat. Meas. 38 809–12, 2004.
13.Yukihara EG, Yoshimura EM, Lindstrom TD, et al. High precision dosimetry for radiotherapy using the optically stimulated luminescence technique and thin Al2O3:C dosimeters. Phys. Med. Biol. 50 5619–28, 2005.
14.Schembri V and Heijmen BJM. Optically stimulated luminescence (OSL) of carbon-doped aluminium oxide (Al2O3:C) for film dosimetry in radiotherapy Med. Phys. 34 2113–8,2007.
15.Miller SD, Murphy M K. Technical performance of the Luxel Al2O3:C optically stimulated luminescence dosemeter element at radiation oncology and nuclear accident dose levels Radiat. Prot. Dosim. 123 435–42, 2007.
16.Jursinic PA. Characterization of optically stimulated luminescent dosimeters, OSLDs, for clinical dosimetric measurements Med. Phys. 34 4594–604, 2007.
17.Yukihara EG and McKeever SWS, Optically stimulated luminescence (OSL) dosimetry in medicine Phys.Med. Biol. 53 R351–79, 2008.
18.Viamonte A, da Rosa LAR, Buckley LA,et al. Radiotherapy dosimetry using a commercial OSL system Med. Phys. 35 1261–6,2008.
19.McKeever SWS, Akselrod MS, Colyott LE, et al. Characteristics of Al2O3 for use in thermally and optically stimulated dosimetry,” Radiat. Prot. Dosim. 84, 163–168, 1999.
20.Bøtter-Jensen L, McKeever SWS. Optically stimulated luminescence dosimetry using natural and synthetic materials. Radiation Protection Dosimetry, 65:273-280, 1996
21.Aguirre J, Alvarez P,Followill D,et al. SU-FF-T-306: Optically Stimulated Light Dosimetry: Commissioning of An Optically Stimulated Luminescence (OSL) System for Remote Dosimetry Audits, the Radiological Physics Center Experience. Medical Physics 36(6), 2009.
22.Yukihara EG, Mardirossian G, Mirzasadeghi M, et al. Evaluation of Al2O3:C optically stimulated luminescence (OSL) dosimeters for passive dosimetry of high-energy photon and electron beams in radiotherapy Med. Phys. 35 260–9, 2007.
23.Stoebe TG and DeWerd LA, Role of Hydroxide Impurities in the Thermoluminescent Behavior of Lithium Fluoride. J. Appl. Phys. 57, 2217, 1985.
24.Mobit P, Agyingi E, Sandison G. Comparison of the energy-response factor of LiF and Al2O3 in radiotherapy beams. Radiat Prot Dosimetry. 119(1-4):497-9, 2006.
25.Kerns JR, Stephen FK, Narayan S et al. Angular dependence of the nanoDot OSL dosimeter. Med Phys. Jul;38(7):3955-62, 2011.
26.Izak-Biran T, Malchi S, Shamai Y, et al. Low Pre- and Post-Irradiation Fading of LiF:Mg, Ti (TLD-100, TLD-600, TLD-700) Using a Preheat Technique. Radiat Prot Dosimetry. 64 (4): 269-274, 1996.
27.Akselrod MS, Bøtter Jensen L and McKeever SWS. Optically stimulated luminescence and its use in medical dosimetry Radiat. Meas. 41 S78–99, 2006.
28.Stanford dosimetry. Whole Body Dose Algorithm for the Landauer InLight LDR Model 2 Dosimeter-InLightD2003. Decenber 18, 2003.
29.許淑燕,蒙地卡羅方法在於核物理中的應用,原子能出版社,2006。
30.Diagnostics Applications Group Los Alamos National Laboratory. MCNP–A General Monte Carlo N–Particle Transport Code Version 4C, April 10, 2000.
31.BC Bhatt. Thermoluminescence, optically stimulated luminescence and radiophotoluminescence dosimetry: An overall perspective. C/o Radiation Safety Systems Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India. 17-Mar, 2012.