安徽省凤台地区土壤中放射性核素测定及外照射剂量计算

The Determination of Radionuclides in Soil from Feng Tai County,An Hui Province,and Estimation of External Doss Rate

用Ge(Li)γ谱仪测定安徽省凤台地区35个点的土壤样品,天然放射性核素的比活度分别为:^(225)Ra,31.00～49.63Bq.kg^(-1);^(223)Th,52.98～69.09Bq.kg^(-1);^(40)K,498.d～737.0Bq.kg^(-1)。rpv UNSCEAR 报告所估算的单位放射性活度离地面1m 处空气中吸收剂量率所计算的总的吸收剂量率为:81.0±5.2×10^(-10)Gy·h^(-1)。由此算得室外年有效剂量当量为99.3μSv 此值比UNCEAR 所估算的室外陆地外照射的年有效剂量当量70μSv 高42%。但与全国估算的均值相同。

Determination of 35 soil samples from Feng Tai County,An zhui province,measured with Ge(Li)γ-spectrometer is presented.The activity mass concentration is as follow:(226)~Ra,31.00～49.63Bq·kg^(-1);(232)~Th,52.98～69 09Bq·kg^(-1),^(40K),498.4～737.0Bq·kg^(-1).Based on The data ofabsorbed dose rate in air lm above The ground surfaces given by UNSCEAR,the total absorbed doserate is estimated robe 81.0±5.0·10^(-10)Gy·h^(-1).On the base of this,the annual effective dose e-quivalents from gamma terrestrial radiation was obtained,which is 99.3μSv from UNSCEAR.It ishigher than the value 70μSv form UNSCEAR.It is equivalant to the average value estinaed for overChina.