摘要
介绍了一种220Rn延迟符合测量中确定偶然符合的方法及计算公式,通过对符合输出数据引入泊松分布达到准确修正偶然符合的目的。利用实验装置对低活度220Rn源进行测量,对同一测量数据进行偶然符合修正求解得到真符合时,该方法与Giffin方法两者相对偏差均在5%以内;通过该方法求源活度,与RAD7连续测氡仪进行了比对,其测量结果与RAD7测量值相对偏差均在14%以内。同时提出了通过实际测量比较的方法求存活因子和衰变因子的计算方案,避免了现有理论计算公式的误差。
The method and calculation formulas to determine the chance coincidence in the ^220Rn coincidence measurement are introduced in this paper. The poisson distribution is introduced to correct the chance coincidence. The relative deviation of the true coincidence between the method and the Giffin is within 5% after the correction of the cohance coincidence. The measurement of ^220Rn is done by comparative measurement with RADT. The results shows that ^220Rn can be measured by the method with a relative deviation of 14%. Mean while, for the ^220Rn flow regime is difficult to meet the condition of calculation formulas, a solution to solve the survival factor and decay factor is proposed and the error come from the useage of theoretical calculation formula is avoided.
出处
《辐射防护》
CAS
CSCD
北大核心
2013年第6期361-366,402,共7页
Radiation Protection
基金
国家自然科学基金资助项目(11175082)
关键词
偶然符合
真符合
存活因子
衰变因子
泊松分布
chance coincidence
true coincidence
survival factor
decay factor
poisson distribution
