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研究生:劉祺章
研究生(外文):ChiChang Liu
論文名稱:奈米尺度探討光子誘發磊晶鑽石膜熱發光現象
論文名稱(外文):Nanometric Scale Studies of Thermoluminescence of CVD Diamond Film Induced By Photon
指導教授:朱鐵吉
指導教授(外文):Tieh-Chi Chu
學位類別:博士
校院名稱:國立清華大學
系所名稱:原子科學系
學門:工程學門
學類:核子工程學類
論文種類:學術論文
論文出版年:2003
畢業學年度:91
語文別:中文
論文頁數:134
中文關鍵詞:熱發光微觀蒙地卡羅靶理論鑽石膜
外文關鍵詞:ThermoluminescenceMicroscopic Monte CarloTarget theoryDiamond film
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鑽石材質具有接近生物組織、化學性質穩定、導熱性好、密度高且不易損壞等特性,一直都是各方面應用的最佳材料,尤其是近年來隨著奈米科技的進步,碳原子的應用更是趨於多元化。利用鑽石作為輻射偵檢材料已發展多年,隨著製程技術提昇而能得到品質較為穩定的鑽石膜來進行探討。
探討過程在理論上是由材料及輻射傳輸兩個角度切入,材料方面使用過去常應用在過渡元素模擬的強鍵模式進行缺陷特性的分析及探討,輻射傳輸則由單一事件蒙地卡羅模擬進行奈米尺度下的模擬。
實驗上則依然採用傳統巨觀的模式進行,不同能量的光子照射鑽石膜並給予不同劑量,然後讀出熱發光的強度以得到其對於輻射的反應。由熱發光的特性配合強鍵模式的探討,嘗試以傳統的動力學模式來分析是否符合預期的結果。由分析結果顯示大部分的特性都是符合強鍵模式的預期結果,例如主輝光峰活化能的理論預估為0.9 eV實驗所得為0.89?0.13 eV、預估會受可見光影響產生易消光的輝光峰也在實驗中觀察到。不過由於兩者為不同缺陷位置,所以可見光對於主輝光峰並不會干擾。
透過採用單一事件蒙地卡羅模擬及基於靶理論的雙隔室模式加以探討則可發現,這些特性主要是源自於微觀的機率性高比能所引起的飽和現象及多能階現象。單擊模式的微觀飽和因數約為1.94?10-6 Gy-1,高比能飽和因數為4?10-11 Gy-2,界隔比能大約為3?104 Gy。因此由本論文所建立的方法是可以用來探討熱發光的微觀特性。

Polycrystalline diamond film that is made by chemical vapour deposition (CVD) method used as thermoluminscent dosimeter for radiation detection has received considerable attention. This crystal has the advantages of tissue equivalence, chemical stability and non-toxicity; these make it an attractive material in dosimetry.
In this work, the predictions of theoretical thermoluminescent properties are determined by tigh-binding model and single-event track-structure Monte Carlo simulation. The former is based on quantum chemistry matrial science. The later is always used to calculate low energy x-ray transportation track and microdosimetric distribution.
Although the experiments are based on macroscopic methods, the microscopic studies are needed to solve the disagreement between theoretical macroscopic results and experimenta data. The predicted value of activation energy by tight binding model is 0.9 eV while the experimental result is 0.89?0.13 eV. The thermoluminscent properties of vacancy defect with hydrogen binding that are predicted to be light sensitive but obvious fading. These are also found in experimental results. However, the relative efficiency for low energy x-ray and radiation damage does not agree with the theoretical prediction.
A modified one-hit model is used to correct the differences. Based on the microscopic target model, some mechanistic insight into the physical aspect of radiation interaction with solid detectors can be obtained. This solid-state detector model shows that the response of radiation is similar to that of some biological system.

第一章、緒論 1
1-1文獻回顧 2
1-2熱發光的原理 3
1-3研究目的與論文架構 11
第二章、鑽石膜鍵結組態 14
2-1鑽石晶格 14
2-2強鍵模式簡介 15
2-3 STATIC程式簡介 19
2-4 鑽石組態模擬 26
第三章、微觀的電子傳輸作用 33
3-1徑跡結構蒙地卡羅法 33
3-2低能電子與物質作用機制及截面 35
3-3微觀輻射劑量相關定義 42
3-4單擊模式 43
3-5程式架構及說明 46
第四章、實驗設備與方法 50
4-1鑽石膜與熱發光計讀儀 50
4-2輻射場 50
4-3輝光曲線分析方法 52
第五章、結果與討論 57
5-1缺陷模擬結果 57
5-2高能光子的輻射反應 63
5-3可見光的影響 73
第六章、結論 81
參考文獻 84

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