安徽茶叶放射性核素含量及卫生评价

Radionuclide Contents in the Famous Teas of Auhui and Their Sanitary Evaluations

分析了２３种安徽名优茶的总α、总β、Ｕ、Ｔｈ、Ｒａ－２２６、Ｋ－４０和Ｓｒ－９０等放射性核素含量，其平均值分别为：３０±１３、５００±８０、（４０±３０）×１０－２、（５０±５０）×１０－２、（１５４±２８）×１０－２、３８０±１３０和１８±５Ｂｑ／ｋｇ。安徽省居民由于饮茶每年摄入的Ｕ、Ｔｈ、Ｒａ－２２６和Ｓｒ－９０分别为０．０５、０．０３、０．０７和３．１Ｂｑ。饮茶摄入的核素待积剂量当量Ｈ５０较居民受天然辐射的本底剂量和饮食摄入的核素Ｈ５０小得多，因而饮茶的附加剂量也非常小，因此，饮茶不会对居民产生核素危害。

The radionuclide contents i.gross α gross β,U,Th,Ra-226,K-40 and Sr-90 in 23 famous teas Pro-duced in Auhui Province were determined, getting arithmetical mean values of 30±13、500±80、(40±30)×10-2、(50±50)×10-2、(154±28)×10-2、380±130 and l8±5Bq/kg,respectively。 The intakes of U、Th、Ra-226 and Sr-90 by the inhabitants through drinking tea were 0.05、0.03、0.07 and 3.1Bq respectively. Thecommitted dosages equivalent H50 of the intaken radionuclides through drinking tea were much smaller thanthose of the natural background radiation and than those of the radionucli des in food.Therefore,the dosagesof additional exposure from drinking tea were small and they were harmless to the inhabitants