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[目的 ]了解我省地下水中的天然放射性水平。 [方法 ]对全省 5 4个县 (市 )的 2 42口水井 ,按规定方法分析测定样品中天然放射性水平。 [结果 ]地下水中 1总 α比活度为 (142 .9± 7.83) Bq·m- 3,总 β比活度为 (93.0± 2 .0 3) Bq·m- 3 ;2 U含量为 (13.37± 5 .0 9) Bq· m- 3 ,Th含量为 (2 .96± 3.12 ) Bq· m- 3 ;3 2 2 6 Ra含量为 (14.6 5± 4.19) Bq·m- 3 ,2 2 2 Rn含量为 178± 5 0 .1× 10 3Bq· m- 3 。 [结论 ]1内陆地下水中天然放射性水平较高区域为福州、莆田、晋江和三明 ,地质结构主要是火成岩、花岗岩岩层 ;较低为海岛和海滨城市 ,以沉积岩、海积岩为主的区域。 2地下水中 6种核素天然放射性水平在丰水期和枯水期无显著性差异 (P>0 .0 5 )。 3地下水中总β、Th比活度内陆与海岛相一致 ,其余 4种天然放射性核素含量内陆高于海岛 (P<0 .0 5 )。 4地下水中 6种天然核素放射性水平一般都在国家限值标准值之内。
[Objective] To understand the natural radioactivity in groundwater of our province. [Method] 2 42 wells in 54 counties (cities) in the province were analyzed and determined by natural radiation method. [Result] The total specific activity of total nitrogen in groundwater was (142.9 ± 7.83) Bq · m-3 and (93.0 ± 2.03) Bq · m- 13.37 ± 5.09) Bq · m-3, Th content was (2.96 ± 3.12) Bq · m-3, and the content of 3 2 2 6 Ra was (14.6 5 ± 4.19) Bq · m- 2 Rn content of 178 ± 5 0 .1 × 10 3Bq · m-3. [Conclusion] 1 The higher natural radioactivity in inland groundwater is Fuzhou, Putian, Jinjiang and Sanming. The geological structure is mainly igneous and granite strata. The lower is islands and seaside cities, and the areas dominated by sedimentary rocks and marine rocks . 2 The natural radionuclides of six radionuclides in groundwater had no significant difference between wet season and dry season (P> 0.05). 3 The total β, Th activity in groundwater is consistent with inland and island, and the content of the other four natural radionuclides is higher than inland (P <0.05). 4 groundwater six kinds of natural radionuclide levels are generally within the limits of national standards.