【摘要】 本文报道上海市土壤中天然放射性核素含量调查的主要结果。基本与环境陆地γ辐射剂量率调查同位布点，全市共采集土壤样品１７３个。测量采用γ能谱法。调查结果表明，上海市土壤（干样）中天然放射性核素含量按面积和按点加权均值分别为：￣（２３８）Ｕ，３７．５和３７．５Ｂｑ／ｋｇ；￣（２２６）Ｒａ，３５．２和３５．５Ｂｑ／ｋｇ；￣（２３２）Ｔｈ，５３．３和５３．５Ｂｑ／ｋｇ；￣（４０）Ｋ，６４０．２和６４１．９Ｂｑ／ｋｇ。更多还原

【Abstract】 This paper reports the methods and results of investigation of natural radionu-clides in soil in Shanghai.The collecting points of soil are the same as those for environmen-tal measurements of ground γ-radiation dose rate.173 soil samples were collected and anal-ysed by γ-spectrometry. The results show that the area-weighted mean of￣(238)U,￣(226)Ra,￣(232)Thand ￣(40)K was 37.5, 35.2, 53. 3 and 640.2 Bq/kg, respectively.The point-weighted mean of￣(238)U,￣(226)Ra,￣(232)Th and ￣(40) K was 37.5, 35.5,53.5 and 641.9 Bq/kg,respectively.更多还原