由於現行採用之熱發光劑量計(如LiF)或以晶片活化評估中子劑量之材料(如金箔)，皆較昂貴且含Li材料因具管制性而不易取得，因此使用便宜且易取得之材料－食鹽，評估其特性及取代現行材料之可行性為最近被常討論的議題之一。本研究目的分為兩個部份，ㄧ為探討食鹽於光子輻射場中之熱發光特性及劑量監測之可行性，二為探討食鹽藉中子活化分析評估中子劑量之可行性。本研究使用市售碘鹽進行取樣後置於自製照射管容器，分別於光子及中子輻射場進行劑量特性研究測試。碘鹽於光子輻射場有較多影響因素，如粒徑大小影響輻射敏感度、消光速率顯著造成低劑量範圍有較大統計誤差，故碘鹽較適合度量中、高劑量，且使用上須考慮碘鹽受濕度之影響。碘鹽於中子輻射場評估之中子通量率經校正後可與金箔不相上下，且有較小之誤差變動，相較於光子劑量評估，碘鹽較適合用於評估中子劑量。

Salt is more easily available and low-cost compared with commercial thermoluminescent dosimeters (TLDs) and activation gold foils. Recently, feasibility study on the replacement of commonly used TLD materials with salt, and evaluation of salt’s dose response properties become the popular issues nowadays. Therefore, the purpose of this study is divided into two parts: one is to investigate the thermoluminescent properties of salt, the other is to evaluate the feasibility of dose monitoring in photon and neutron radiation fields respectively.
In this study, self-made capsules filled up the commercially available iodized salt in Taiwan were irradiated to investigate the dosimetric characteristics in photon and neutron radiation fields respectively. Iodized salt has several influencing factors to dose reponse in the photon radiation field. For example, the particle size affects the radiation sensitivity and the fading rate significantly causes a large statistical error in the low dose range. Therefore, the iodized salt is more suitable for measuring doses in medium and high levels, and must consider the influence of humidity to dose response. On the other hand, the neutron flux rate estimated by the iodized salt in the neutron radiation fields is calibrated to be comparable to that of the gold foil, and has a small error deviation. Compared with the application of photon dose evaluation, the iodized salt is more suitable for evaluating the neutron dose.

中文摘要 I
Abstract II
誌謝 IV
目錄 V
表目錄 IX
圖目錄 XI
第一章　緒論 1
1.1　前言 1
1.2　熱發光材料與應用 3
1.3　輻射場及其應用 7
1.4　文獻回顧 11
1.4.1　熱發光 11
1.4.2　中子活化分析 17
1.5　研究目的 20
第二章　材料與方法 22
2.1　食鹽 22
2.2　垂直照射管 27
2.3　蒙地卡羅模擬 28
2.3.1　MCNP軟體 28
2.3.2　能量依存性修正 29
2.3.3　能量鑑別 30
2.4　演算法建立 32
2.5　熱發光基本特性之實驗設計 33
2.5.1　輝光曲線 33
2.5.2　回火條件 33
2.5.3　背景訊號累積 35
2.6　光子照射實驗設計 36
2.6.1　消光 37
2.6.2　劑量校正 37
2.6.3　均勻性評估 38
2.7　中子照射實驗設計 40
2.7.1　中子照射參數 40
2.7.2　偵檢器 43
2.7.3　中子劑量評估 47
第三章　結果與討論 50
3.1　熱發光基本特性 50
3.1.1　輝光曲線 50
3.1.2　回火條件 53
3.1.3　背景訊號累積 61
3.2　蒙地卡羅模擬 64
3.2.1　能量依存性修正 64
3.2.2　能量鑑別 65
3.3　光子照射 66
3.3.1　消光 66
3.3.2　劑量校正 68
3.3.3　均勻性評估 75
3.4　演算法 76
3.5　中子照射 78
第四章　結論 84
參考文獻 86
附錄ㄧ HPGe效率校正數據 90
附錄二 光子能量依存性及能量鑑別之詳細數據 91
附錄三 劑量反應曲線詳細數據 92
附錄四 演算法於各個實驗之詳細數據 93

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