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目的考察密封时间对锆英砂中天然核素比活度测量值的影响。方法分别密封0、1、4、7、11、15、20和30天,采用HPGeγ谱仪测量锆英砂中四种天然核素~(238)U、~(232)Th、~(226)Ra和~(40)K的比活度,评价密封时间对测量值的影响。结果密封时间对锆英砂中~(238)U、~(232)Th和~(40)K的测量值基本无影响,对~(226)Ra的影响小于2%。结论对锆英砂的天然核素分析可以即刻进行,不必密封等待。
Objective To investigate the effect of sealing time on the measurement of specific activity of natural radionuclides in zircon sand. Methods Separation of four natural radionuclides ~ (238) U, ~ (232) Th, ~ (226) in zircon sand was measured by HPGe γ spectrometer at 0,1,4,7,11,15,20 and 30 days respectively. Ra and ~ (40) K specific activity, evaluation of the sealing time on the measured value. Results The sealing time had no effect on the measured values of ~ (238) U, ~ (232) Th and ~ (40) K in zircon sand, but less than 2% for ~ (226) Ra. Conclusion The natural radionuclide analysis of zircon sand can be done immediately without waiting for a seal.