土壤γ辐射剂量率间接测量中的^（222）Rn析出和含水量修正  

The Beck Formula Revision for ￣(222)Rn Escape and the Water Content in the Indirect Measurement of Gamma Radiative Dose Rate from Soil

作　　者：姜让荣 

机构地区：[1]浙江省环境放射性监测站

出　　处：《核电子学与探测技术》1994年第1期26-33,共8页Nuclear Electronics & Detection Technology

摘　　要：本文针对Ｂｅｃｋ公式的局限性，对土壤的含水量和￣（２２２）Ｒｎ析出引起的γ辐射剂量率变化进行了修正。通过浙江省５７６组测量数据的实验拟合，给出了剂量率计算的修正公式。该公式应用到浙江省自身的测量数据上，使计算的总体均值与实测均值仅相差０．８％；每一点位的计算值与实测值相比，平均仅相差３．４％，其比值离散性与实验误差相一致。而Ｂｅｃｋ公式的计算结果与实测剂量率相比较，以上两项分别偏离＋１０％和１５．２％，且离散性也比实验误差大。修正公式应用在气象条件和土壤条件与浙江省有很大差别的北京市，计算结果的总体均值与实测均值仅相差３．５％；每一点位的计算值与实测值相比，平均相差仅２．１％，其离散性也在实验误差范围内。由此可见，修正公式有很高的可靠性和广泛的适用性，不失为陆地γ辐射剂量率的估算的有效方法。This paper points out the limitation of Beck Formula,revises the formula for the water conternt and ￣(222)Rn escape in soil,and gives out a revised formula to calculate the gamma radia-tive dose rate through experimental fitting for 576 sets of data measured in Zhejiang Province.When the revised formula is applied to the data measured in Beijing City,where there is a greatdifference in meteorology and soil condition from zhejiang,the general average calculated onlydiffers by 3.5%from the real measured value,the data of every positions only differ by 2.1%averagely and is in the same precision with Beck Formula.When it is applied to Zhejiang measurement,the general average is different by 0.8%from the real measured value,the calculat-ed data of every positions are different by 3.4%averagely and their dispersionality is within the experimental error.But these two results calculated with Beck Formula are+10.0%and +15.2%repectively,and the dispersionality is larger than the experimental error.It shows that the revised formula possesses a high reliability,a wide suitability and is a more effective method to estimate the gamma radiative dose rate on land than Beck Formula.(

关 键 词：土壤 Γ辐射 剂量率 氡222 含水量 

分 类 号：X837[环境科学与工程—环境工程]