HPGe γ谱仪测量级联γ辐射~(152)Eu、~(133)Ba、~(60)Co核素活度的方法
|
摘要
给出了HPGeγ谱仪测量级联γ辐射核素活度的一种实用方法,在探测器与样品之间放置一定厚度的水吸收层,能够很好降低探测效率,显著降低级联γ符合效应和偶然符合效应的影响。实验表明,TC-45样品中~(152)Eu、~(133)Ba、~(60)Co核素活度的探测效率和测量活度相对偏差随水吸收层厚度增加遵循指数衰减规律,当厚度增加到70 mm以上,其测量活度相对偏差小于4%。
A practical method for measurement of cascade gamma radiation nuclide by HPGe gamma spectrometer is given. A certain thickness water absorption layer is placed between the detector and the sample,which can reduce the detection efficiency and reduce the effect of the cascade gamma coincidence effect.Experiments showed that the detection efficiency and activity relative deviation of~(133) Ba,~(60)Co and~(152) Eu radionuclide in TC-45 samples are followed by exponential decay with the increase of the water absorption layer thickness. When the thickness is increased to 70 mm,the relative deviation of measurement is less than 4%.
A practical method for measurement of cascade gamma radiation nuclide by HPGe gamma spectrometer is given. A certain thickness water absorption layer is placed between the detector and the sample,which can reduce the detection efficiency and reduce the effect of the cascade gamma coincidence effect.Experiments showed that the detection efficiency and activity relative deviation of~(133) Ba,~(60)Co and~(152) Eu radionuclide in TC-45 samples are followed by exponential decay with the increase of the water absorption layer thickness. When the thickness is increased to 70 mm,the relative deviation of measurement is less than 4%.
引文
[1]中国计量科学研究院.EJ/T 1091—1999放射性核素活度测量锗γ谱法[S].北京:中国核工业总公司,1998.
[2]赵燕子.体源中60Coγ射线的符合相加修正因子测量[J].核电子学与探测技术,2008,28(5):994-998.
[3]王强,方开洪,周钰珊,等.HPGe-γ谱仪系统的死时间校正[J].核电子学与探测技术,2013,33(9):1 119-1 122.
[4]巨凌军,申茂泉,张洋,等.无源效率刻度技术在γ谱分析中的应用[J].核电子学与探测技术,2011,31(1):39-43.
[2]赵燕子.体源中60Coγ射线的符合相加修正因子测量[J].核电子学与探测技术,2008,28(5):994-998.
[3]王强,方开洪,周钰珊,等.HPGe-γ谱仪系统的死时间校正[J].核电子学与探测技术,2013,33(9):1 119-1 122.
[4]巨凌军,申茂泉,张洋,等.无源效率刻度技术在γ谱分析中的应用[J].核电子学与探测技术,2011,31(1):39-43.