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研究生： 陳韋霖
Chen, Wei-Lin
論文名稱： 建築物內宇宙射線牟子與中子的研究
Studies of cosmic-ray muons and neutrons in a concrete building
指導教授： 許榮鈞
Sheu, Rong-Jiun
口試委員: 張似瑮
Chang, Szu-Li
林威廷
Lin, Uei-Tyng
蔡惠予
Tsai, Hui-Yu
洪明崎
Horng, Ming-Chi
學位類別： 博士
Doctor
系所名稱： 原子科學院 - 核子工程與科學研究所
Nuclear Engineering and Science
論文出版年： 2018
畢業學年度： 106
語文別： 中文
論文頁數： 209
中文關鍵詞： 宇宙射線牟子 、宇宙射線中子 、蒙地卡羅模擬 、輻射度量 、混凝土建築
外文關鍵詞： Cosmic-ray muons, Cosmic-ray neutrons, Monte Carlo simulations, Radiation measurements, Concrete building
相關次數： 點閱：3  下載：0 
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    • 地表的宇宙射線劑量以宇宙射線牟子及中子的貢獻為主，因此，過去地表的宇宙射線研究多圍繞著宇宙射線牟子與中子進行探討。然而，卻少有文獻同時探討建築物對宇宙射線牟子與中子的屏蔽效應。基於精進建築物內宇宙射線研究的目的，本研究運用了實驗量測及理論計算方法，同時評估建築物內的宇宙射線牟子與中子的通率/劑量率分佈。本研究採用了柏克萊實驗室宇宙射線偵檢器及高靈敏中子偵檢器，觀測台灣地表及清華大學工科館內宇宙射線牟子與中子隨環境變化的趨勢。利用發展純熟的FLUKA宇宙射線模型，以地球實際尺寸、美國標準大氣模型及理想地磁模型執行蒙地卡羅模擬，獲取台灣地表的宇宙射線牟子與中子資訊。由於宇宙射線模型幾何過於龐大，無法直接用來評估建築物對宇宙射線造成之效應。截至目前為止，亦鮮少有研究在理論計算中，考慮真實的建築物結構。為了突破建築物內宇宙射線理論計算的困窘，本研究提出了二階地表宇宙射線模擬方法。該方法透過完整宇宙射線模擬取得台灣海拔200公尺處的宇宙射線牟子與中子的完整特性，並建立二階地表宇宙射線模型，於海拔200公尺處延續大氣層牟子與中子的發展歷程。透過一系列高空與地表宇宙射線模擬與量測的比較，本研究對理論預測效能進行分析及探討，在利用中子量測結果修正的前提下，於理論預測結果與量測間取得了良好的一致性。
    本研究將二階地表宇宙射線模擬方法應用於工科館宇宙射線牟子與中子的研究及建築物屏蔽因數的研究上。於工科館的研究中，本研究展示了工科館內宇宙射線牟子與中子的詳細分布，並決定出宇宙射線牟子和中子於工科館空曠屋頂處的年有效劑量分別為115.2與35.2 μSv a-1，於東側走廊處的劑量率逐層衰減至一樓分別降至97.8與9.9 μSv a-1，每層樓(15公分厚混凝土)對宇宙射線牟子及中子的衰減因數分別決定為0.97與0.78。
    建築物屏蔽因數的研究中，本研究探討了兩種常見的建築物型態：20層大樓及5層集合住宅，研究結果充分顯示了側向入射對低樓層的宇宙射線牟子與中子劑量貢獻，有著不可忽略的重要性。本研究決定出宇宙射線牟子與中子的建築物屏蔽因數分別為0.95及0.60。此外，本研究考量宇宙射線劑量組成隨高度變化明顯，以及建築物對不同宇宙射線屏蔽效應的差異，進一步地決定出對整體宇宙射線的建築物屏蔽因數，該因數與海拔高度相依，由海平面的0.79逐漸下降至海拔5000公尺處的0.65。
    本研究利用二階地表宇宙射線模擬方法，更合理地估算建築物屏蔽因數，評估結果提供了未來群體劑量評估工作一新參考資訊。此外，本研究所建立的二階地表宇宙射線模擬方法，亦可在未來作為宇宙射線相關應用的研究工具，例如宇宙射線牟子造影、宇宙射線中子水分探測技術等。

    Cosmic-ray muons and neutrons dominate cosmic-ray dose at terrestrial altitude. Because of the significant of muons and neutrons, most of the past indoor cosmic ray studies focused on cosmic-ray muons or neutrons. However, those studies rarely investigated both of them simultaneously. Therefore, this study thoroughly determined the flux and dose rate distributions of cosmic-ray muons and neutrons in concrete building by comparing measurements with Monte Carlo simulations of cosmic-ray showers. An angular-energy-dependent surface source comprising secondary muons and neutrons at a height of 200 m above ground level was established and verified, which was used to concatenate the shower development in the upper atmosphere with subsequent simulations of radiation transport down to ground level, including the effect of the terrain and studied building. A Berkeley Lab cosmic-ray detector and a highly sensitive Bonner cylinder were used to perform muon and neutron measurements on each building floor. After careful calibration and correction, the measured responses of the two detectors were discovered to be reasonably consistent with the theoretical predictions, thus confirming the validity of the two-step calculation model employed in this study.
    This study shows two practical applications of two-step calculation model. The first application is calculation of cosmic-ray muons and neutron flux/dose distribution in a 5-story concrete building, and the second one is evaluation of building shielding factor. In the first application, three-dimension cosmic-ray muons and neutron flux/dose distributions in the concrete building were obtained. The annual effective doses from cosmic-ray muons and neutrons on the open roof of the building were estimated to be 115.2 and 35.2 Sv, respectively. Muons and neutrons were attenuated floor-by-floor with different attenuation factors of 0.97 and 0.78, and their resultant dose rates on the first floor of the building were 97.8 and 9.9 Sv, respectively.
    In the second application, shielding effects of two popular buildings on cosmic-ray muons and neutrons were investigated in Taiwan. The results indicated the importance of considering the lateral particle incidences in indoor cosmic ray studies. The building shielding factors for muons and neutrons were determined to be 0.95 and 0.60, respectively. Because of cosmic-ray dose composition varies with altitude, we proposed altitude-dependent building shielding factor be applied to indoor cosmic-ray dose evaluation. The building shielding factor was determined to be 0.79 at sea-level, then decreased down to 0.65 at altitude of 5000 m.
    This study adopted a verified two-step calculation model to evaluate building shielding factor more reasonable. The consequents will be helpful to improve the accuracy of population dose evaluation. Furthermore, the two-step calculation model is a useful tool for cosmic-ray application studies, such as muon radiography and moisture detection by cosmic-ray neutron sensors.

    摘要 I ABSTRACT III 誌謝 V 目錄 VI 表目錄 X 圖目錄 XI 第1章 導論 1 1.1 銀河宇宙射線 1 1.2 文獻回顧 9 1.2.1 高空宇宙射線 9 1.2.2 地表宇宙射線 14 1.2.3 建築物宇宙射線 20 1.2.3.1 建築物對宇宙射線牟子的影響 20 1.2.3.2 建築物對宇宙射線中子的影響 21 1.2.3.3 建築物內的宇宙射線曝露率 22 1.2.3.4 建築物屏蔽因數 24 1.3 研究動機 26 1.4 研究架構 28 第2章 材料與方法 30 2.1 實驗儀器與量測 30 2.1.1 宇宙射線偵檢器 31 2.1.2 中子偵檢器 33 2.1.3 量測系統整合 35 2.1.4 量測條件 37 2.1.4.1 室外量測實驗 37 2.1.4.2 室內量測實驗 40 2.2 宇宙射線模擬 43 2.2.1 FLUKA宇宙射線模擬介紹 43 2.2.1.1 銀河宇宙射線射源 45 2.2.1.2 太陽調制 47 2.2.1.3 地球幾何描述 48 2.2.1.4 地磁及截止剛度 50 2.2.2 模擬條件 50 2.2.2.1 室外宇宙射線 51 2.2.2.2 工科館宇宙射線 57 2.2.2.3 劑量轉換因數 61 2.3 偵檢器響應函數 63 2.3.1 宇宙射線偵檢器響應函數 63 2.3.2 中子偵檢器響應函數 68 第3章 結果與討論 72 3.1 室外宇宙射線牟子與中子的研究 72 3.1.1 高空宇宙射線牟子與中子模擬的驗證 72 3.1.2 地表宇宙射線牟子與中子模擬與量測的比較 76 3.1.2.1 理論預測偵檢器計數率與量測的比較結果 76 3.1.2.2 理論預測結果與量測的差異探討 81 3.1.2.3 理論預測結果的修正 86 3.2 二階地表宇宙射線模擬 91 3.2.1 低空宇宙射線牟子與中子能譜/角分布 91 3.2.2 二階地表宇宙射線模擬幾何與驗證 93 3.3 二階地表宇宙射線模擬應用於工科館宇宙射線牟子與中子的研究 97 3.3.1 工科館量測結果 97 3.3.2 工科館宇宙射線牟子與中子能譜模擬結果 98 3.3.3 理論預測偵檢器計數率與量測的比較結果 101 3.3.4 工科館宇宙射線牟子與中子通率/劑量率分布 104 3.4 二階地表宇宙射線模型應用於建築物屏蔽因數的研究 109 3.4.1 建築物探討案例 110 3.4.1.1 20層混凝土大樓 110 3.4.1.2 5層集合住宅 112 3.4.2 建築物宇宙射線牟子與中子能譜/劑量率 114 3.4.2.1 20層混凝土大樓計算結果 114 3.4.2.2 5層集合住宅計算結果 125 3.4.2.3 20層大樓與5層集合住宅宇宙射線牟子與中子能譜的比較 131 3.4.3 建築物屏蔽因數 135 第4章 結論與建議 143 4.1 結論 143 4.2 未來研究方向 146 4.2.1 宇宙射線偵檢器的問題 146 4.2.2 群體劑量評估 148 4.2.3 二階地表宇宙射線模擬方法的其它應用 150 參考文獻 151 附錄A FLUKA宇宙射線模擬方法 162 附錄B 本研究模擬計算編碼輸入檔彙整 168 附錄C 二階地表宇宙射線模擬射源檔 170 附錄D 論文發表 190

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