无源效率刻度方法在放射性气体氙同位素测量中的研究

Study on Efficiency Calibration Method Without a Radioactive Source in Measurement of Xenon Isotopes of Radioactive Gases

由于放射性气体氙难以采集,只能采用特制吸附容器,导致缺乏与氙吸附容器形状相同的标准体源用于γ能谐测量的效率刻度。利用MCNP粒子输运模拟程序对吸附容器进行了无源效率刻度,并利用点源模拟实验进行了效率刻度验证。模拟计算放射性氙同位素主要全能峰能量为81 keV.163.9 keV.233.2keV和249.8 keV,效率刻度结果符合性较好。MNCP无源效率刻度方法适用于放射性气体氙活度测量的效率刻度应用。

Due to the difficulty of collecting radioactive xenon gas,a special adsorption container has to be used,which leads to the lack of the standard volume source with the same shape as the xenon adsorption container for the efficiency calibration of gamma spectrometry measurement.The passive efficiency calibration of the adsorption vessel was carried out by using MCNP particle transport simulation program,and the efficiency calibration was verified by point source simulation experiment.The main full-energy peak energies of radio xenon isotopes are calculated,which are 81 keV,163.9 keV,233.2 keV and 249.8 keV.The efficiency calibration results are in good agreement.The source-less efficiency calibration of MNCP method is suitable for the detection of Radio xenon gas Isotope.