硼中子捕獲治療(BNCT)應用在癌症治療，尤其是惡性腦腫瘤及黑色素瘤，能達到治療效果並降低對正常細胞的傷害，成果較傳統的放射性治療要來的好。目前BNCT的發展主要是以超熱中子束來進行治療，在進入人體後減速形成熱中子，並在2到3公分處產生尖峰，一方面能夠有效治療深層的腫瘤，一方面能夠避免外科手術打開頭蓋骨的危險性。

本研究為清華水池式反應器(THOR)改建的BNCT超熱中子射束特性研究的一部份，利用活化偵檢器進行THOR BNCT射束的中子通率測量。活化偵檢器為金鋁、純銅、錳鎳三種金屬箔片構成的箔片組，箔片活化後利用中子活化分析技術（高純鍺偵檢器進行加馬射線能譜計測，GammaVision軟體進行能譜分析）計算出箔片反應率，並利用箔片反應率推算出熱中子以及超熱中子通率值。

實驗目的主要在建立中子通率測量的標準程序，反應器1 MW功率運轉下，測量空氣中射束出口位置的熱中子通率、超熱中子通率；以及沿射束中心軸線距射束出口16公分位置，一個35 × 35 × 31立方公分水假體內，隨深度變化各點位置的熱中子及超熱中子通率值測量。並配合蒙地卡羅方法採用MCNP4C 程式及ENDF/B-VI反應截面資料，進行空氣中、水假體內，箔片反應率及中子通率的模擬計算結果。利用實驗測量結果與模擬計算結果相比對，並試圖解釋其中差異的存在以及誤差的可能性。

活化偵檢器中子通率測量屬於射束特性標準測量，測得的中子通率將應用在分裂腔的校正及游離腔、熱發光劑量計測量的參照標準。

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