CAJ | 학술논문

针对环境样品天然放射性核素分析中，伽马谱仪对238 U、235 U等发射低能特征γ射线（＜200 keV）核素的测量准确性较差问题，运用灵活性强、适用范围广的无源效率刻度方法。考虑样品的吸收衰减、特征峰本底扣除、样品盒几何尺寸等因素的影响，使实验结果的准确度得到了较大的提高，最大相对偏差＜8．0％。
침대배경양품천연방사성핵소분석중，가마보의대238 U、235 U등발사저능특정γ사선（＜200 keV）핵소적측량준학성교차문제，운용령활성강、괄용범위엄적무원효솔각도방법。고필양품적흡수쇠감、특정봉본저구제、양품합궤하척촌등인소적영향，사실험결과적준학도득도료교대적제고，최대상대편차＜8．0％。
The poor measurement accuracy of 238 U and 235 U which emit low-energy gamma rays (<200 keV) are existed in natural radioactive nuclide analysis in environmental samples using gamma spectrometer.In this paper, the accuracy of the obtained experimental results were improved significantly with the maximum relative error <8.0%by using strong flexibility, wide applicable source-less efficiency calibration method, and con-sidering the influence of various factors such as the absorption attenuation, the background deduct of character-istic peak and the geometry size of sample box.