【摘要】 本文报道宁夏回族自治区土壤中天然放射性核素含量调查的结果。基本与环境陆地γ辐射剂量率调查同位布点，全省共采集并作分析的土壤样品有１９２个，其中网格点土样９５个。测量采用放化分析方法。调查结果表明，按９５个网格点土样的测量结果统计，宁夏回族自治区土壤（干样）中天然放射性核素含量按面积和按网格点加权平均值分别为：￣（２３８）Ｕ，３０．９和３１．１Ｂｑ·ｋｇ￣（－１）；￣（２２６）Ｒａ，３０．４和２９．８Ｂｑ·ｋｇ￣（－１）；￣（２３２）Ｔｈ，４１．８和４１．８Ｂｑ·ｋｇ￣（－１）；￣（４０）Ｋ，６９９．９和７００．２Ｂｑ·ｋｇ￣（－１）。更多还原

【Abstract】 This paper reports the methods and results of survey of natural radionuclides insoil in the Ningxia Hui Antonomous Region. The collecting points of soil are same as themeasuring points of γ radiation dose rate of environmental ground.192 soil samples were col-lected and analysed by radiochemical method ,of which 95 points were sited in uniformly dis-tributed networks of size 25 km × 25 km. The results show that the area-weighted mean of￣(238)U、￣(226)Ra、￣(232)Th、 and￣(40)K was 30.9,30.4,41. 8 and 699.9Bq·kg￣(-1) ,respectively. The pointweighted mean of￣(238)U、￣(226)Ra、￣(232)Th、 and￣(40)K was 31.4,29.8,4l. 8 and 700.2Bq·kg￣(-1),respec-tively.更多还原