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活性炭测氡需要对暴露时间和静置时间进行校正,目前国家标准GB/T14582-1993使用的方法是:采用t_1~(0.49)(t_1为暴露时间)进行暴露时间校正;采用e~(-(t_1/2+t_2)(?))(t_2为静置时间)进行衰减校正。为了对标准中的校正方法进行验证并分析其校正误差,采用活性炭γ能谱计数模拟计算方法对不同暴露时间和静置时间所引起的活性炭γ能谱计数进行了计算。结果表明,在暴露时间相差(-12h～+12h)时,暴露时间校正误差为5.0%～-3.9%,同时引起衰减校正误差为4.4%～-4.6%。足够长的静置时间可以保证衰减校正无误差,静置时间可根据暴露时间灵活调整:暴露时间≤48h,静置时间≥3h;暴露时间≥72h,静置时间可缩短至<3h。
Activated carbon measured radon exposure time and resting time need to be corrected, the current national standard GB / T14582-1993 using the method is: the use of t_1 ~ (0.49) (t_1 for the exposure time) exposure time correction; using e ~ (- (- t_1 / 2 + t_2) (?)) (t_2 is standstill time). In order to validate the calibration method in the standard and analyze its calibration error, the γ spectra of activated carbons caused by different exposure time and standstill time were calculated by the method of γ energy spectrum counting simulation. The results showed that the exposure time correction error was 5.0% -3.9% and the error correction error was 4.4% -4.6% at the same exposure time (-12h ~ + 12h). Long enough time to rest assured that the attenuation correction error-free, resting time can be flexibly adjusted according to exposure time: exposure time ≤ 48h, standing time ≥ 3h; exposure time ≥ 72h, standing time can be shortened to <3h.