質子束，離子束的一種，最常使用於高能物理、原子核物理。由於許多粒子在一般條件下不存在或不單獨出現，只能使用粒子加速器的射源，在高能相撞的條件下產生與研究。其他領域中，半導體界也使用離子束進行材料表面改質(Ion Beam Modification of Materials, IBMM)。在近年國際間已陸續成立質子暨放射治療中心，將質子束用於癌症治療上，利用質子束的劑量深度曲線特性，針對特定的部位給予正確劑量與能量，用加速帶電子粒子準確射向腫瘤位置，將主要劑量控制在標靶淺層阻織，減少對正常細胞的損傷，以達到其治療效果。為了能夠順利按照計畫治療，需要有效且準確的射束監控，目前射束監控的技術包含法拉第杯、二次電子監控、氣體電子倍增跟游離腔，本篇研究主要在於自製監測游離腔，來提升監測質子束輸出與計畫的一致性。為了確認自製游離腔是否有效執行，進行γ-ray測試、大氣環境中3.0 MeV和3.5 MeV質子射束驗證與工作電壓特性曲線實驗。結果顯示，在 γ-ray測試中，自製監測游離腔能夠運作。空氣中3.0 MeV和3.5 MeV質子射束驗證實驗中，確定空氣中質子射束的產生，表示此實驗系統是可用的。在工作電特性曲線實驗有觀察到充氣式偵檢器的工作電壓曲線，但與預期結果相比，訊號收集效率不彰。日後可依不同條件把校正曲線建構出來，進一步能實際運用在監測質子束。

Proton beam, as one of the ion beam, applied in physics of high energies and nuclear. Under general condition, the atom is not exist alone. The only way to use proton is from the source of particle accelerator under the high-energy collision .In another hand, the semiconductor procession uses ion beam to do IBMM (Ion Beam Modification of Materials). Recently, there are more proton therapy facility built for the cancer patients. According to the dose depth curve, the specific energy of the source has the maximum releasing when approaching the specific target. The accelerated ion can reach the tumor accurately for the cancer therapy. The dose of the source realising as reach specific point in the curation need to be exactly monitored. The way to monitor the proton beam include: Faraday Cup, Secondary Electron Monitor, Gas Electron Multiplier and Ionization Chamber. The aim of this study is to make a designed, self-made parallel-plate ionization chamber if it could be more accurate and specific for monitor the proton beam. The experiments include γ-ray test program, and proton beam current voltage characteristics curve. The result showed that the self-make parallel-plate ionization chamber was useable underγ-ray test program. Besides, proton beam was produced in the experiment of 3.0 MeV、3.5 MeV external proton beam in air verification, which confirmed this experiment system could work. There was a phenomenon of the curve in the current voltage characteristic curve experiment but with less signal collection efficiency. In the future, the calibration curve could be built under different situation to apply into monitoring of the proton beam output.

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