闽东南土壤岩石中天然放射性核素水平调查研究

报道了闽东南地区土壤岩石中天然放射性核素含量调查的结果。调查布点基本与环境陆地γ辐射剂量率调查布点同位。该调查结果表明 :闽东南地区由花岗岩、混合岩和中酸性火山岩就地分化残留物沉积而成的酸性红壤土中的2 38U、2 32 Th、2 2 6 Ra、4 0 K放射性核素平均含量分别为 62 .3Bq/kg、73 .2Bq/kg、1 1 5Bq/kg和 872Bq/kg ;2 38U、2 2 6 Ra含量 ,花岗岩类 >中酸性火山岩类 变质岩类 >基性岩类 ;2 32 Th、4 0 K含量 ,中酸性火山岩类 >花岗岩类 变质岩类 >基性岩类 ,与不同岩石所在地区原野γ辐射剂量率、室外空气中2 2 2 Rn及其子体浓度的测定结果基本一致。

Natural Radio-nuclides Content Profile in Soil and Rock of Southeast Fujian

This paper reports on the survey of natural radio nuclides in soil and rock conducted in Southeast Fujian. The points for sampling are similar to those for measuring γradiation dose rate of the environment. The radio nuclides measured include 238 U, 236 Ra, 232 Th and 40 K, and their levels vary greatly for different soils and rocks. For 238 U, 236 Ra, the ranking of radio nuclides content is granite, the highest followed by middle acid volcanic rocks, metamorphic rock and basic rock; whereas for 232 Th and 40 K middle acid volcanic rocks ranks first, followed by granite, metamorphic rock and basic rock. This profile is basically consistent with the measurement results ofγradiation dose rate and 222 Rn and its progeny concentrations in outdoor air in this region.