CAJ | 학술논문

电离室测氚因其不需要制样、可以在线监测而被广泛应用。在γ场中测氚时，电离室对氚敏感的同时对γ射线也很灵敏，其难点是如何补偿由于γ辐射产生的信号。采用实验测量和蒙特卡罗模拟对比研究了气体成份及压强对测氚电离室γ补偿能力的影响，分析了γ射线在充有不同成份及压强气体的单电离室中产生的电离电流，得到了测氚电离室密封室与测量室气体成份及压强差异对电离室γ补偿的影响规律。由实验结果可知，在一个标准大气压下，γ射线在不同成份及压强气体下的电离电流差异高达93％；对于底对底电离室模型，在标准大气压下，补偿室中气体成份的差异可使测量室与补偿室电离电流之差高达75％；补偿室为氩气时，气体压强的差异可使测量室与补偿室电离电流之差高达77％。
전리실측천인기불수요제양、가이재선감측이피엄범응용。재γ장중측천시，전리실대천민감적동시대γ사선야흔령민，기난점시여하보상유우γ복사산생적신호。채용실험측량화몽특잡라모의대비연구료기체성빈급압강대측천전리실γ보상능력적영향，분석료γ사선재충유불동성빈급압강기체적단전리실중산생적전리전류，득도료측천전리실밀봉실여측량실기체성빈급압강차이대전리실γ보상적영향규률。유실험결과가지，재일개표준대기압하，γ사선재불동성빈급압강기체하적전리전류차이고체93％；대우저대저전리실모형，재표준대기압하，보상실중기체성빈적차이가사측량실여보상실전리전류지차고체75％；보상실위아기시，기체압강적차이가사측량실여보상실전리전류지차고체77％。
Ionization chamber for tritium measurements have been widely applied for the characteristic of on -line monitoring and no sample preparation .Gamma rays of tritium monitoring sites will affect tritium measure-ment, the difficulty of tritium measurement is how to compensate the background generated by gamma radiation . In the paper, the experimental measurements and Monte Carlo simulation method are used to study the influence of gas composition and gas pressure to gamma compensation ability of ionization chamber , and analysis of the re-lationship between ionization current of ionization chamber generated by gamma rays and gas component and pressure, and get the law of the impaction of gas component and pressure to the gamma compensation of ioniza -tion chambers.It turn out that in a standard atmospheric pressure , the ionization current of the chamber differ-ence up to 93%.For the base to base ionization chamber , the difference of ionization current between measure-ment chamber and compensation chamber up to 75%in a standard atmospheric, which caused by different gas component of compensation chamber .The difference of the ionization current between measurement chamber and compensation chamber up to 77%when the gas pressure of compensation chamber changed .