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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
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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.

    目次 圖目錄 IV 表目錄 VI 中文摘要 VII ABSTRACT VIII 誌謝 X 第1章 緒論 1 1.1 研究背景 1 1.2 OSL發展之文獻回顧 3 1.3 OSL原理 4 1.4 OSLD與TLD之比較 6 1.5 研究動機與問題 7 第2章 材料與方法 9 2.1 材料與設備 9 2.1.1 OSLD 9 2.1.2 OSLD計讀儀 10 2.1.3 OSLD指環與濾片 11 2.1.4 手指假體 12 2.1.5 劑量照射場 13 2.2 蒙地卡羅模擬 14 2.2.1 蒙地卡羅模擬流程 16 2.2.2 OSLD指環結構模擬 17 2.2.3 模擬參數 19 2.2.4 模擬光子場特性 21 2.2.5 擬合計算曲線 23 2.3 劑量計算演算法建立 24 2.3.1 演算法流程 25 2.3.2 GUI 28 2.4 實驗設計 29 2.4.1 再現性測試 30 2.4.2 劑量校正實驗 31 2.4.3 最低可測劑量 32 2.4.4 劑量演算法驗證實驗 33 第3章 結論與討論 34 3.1 蒙地卡羅模擬結果 34 3.1.1 模擬光子場特性結果 34 3.1.2 擬合計算曲線結果 38 3.2 實驗結果 44 3.2.1 再現性測試結果 44 3.2.2 劑量校正結果 46 3.2.3 最低可測值結果 47 3.2.4 劑量演算法驗證實驗結果 48 3.3 角度依存性的影響 51 第4章 結論 54 參考文獻 56 附錄一、劑量演算法流程圖 60 附錄二、劑量轉換因子(KERMA TO SHALLOW DOSE) 61 附錄三、GUI程式碼 (*.M) 62 附錄四、蒙地卡羅模擬程式碼 67

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