巴西圣保罗州饮用水供应中的天然放射性核素及由此产生的人群剂量。

Natural radionuclides in drinking water supplies of São Paulo State, Brazil and consequent population doses.

作者信息

de Oliveira J, Mazzilli B P, Sampa M H, Bambalas E

机构信息

Departamento de Radioprotecão Ambiental, Instituto de Pesquisas Energéticas e Nucleares Travessa R, 400-Cidade Universitária, Caixa Postal 11049-CEP 05422-970, São Paulo, Brazil.

出版信息

J Environ Radioact. 2001;53(1):99-109. doi: 10.1016/s0265-931x(00)00101-6.

DOI:10.1016/s0265-931x(00)00101-6

PMID:11378932

Abstract

The activity concentrations of 228Ra, 226Ra and 222Rn have been analysed in 452 drinking water supplies of São Paulo State. This study started in 1994 and covered 54% of the 574 existing counties. Concentrations up to 235 and 131 mBq l-1 were observed for 226Ra and 228Ra, respectively, whereas 222Rn concentrations reached 315 Bq l-1. Radiation doses up to 0.3, 0.6 and 3.2 mSv yr-1 were estimated for the critical organs, for the ingestion of 226Ra, 226Ra and 222Rn, respectively. The corresponding committed effective doses reached values of 6 x 10(-3), 2 x 10(-2) and 3 x 10(-1) mSv yr-1, for the same radionuclides. These results indicate that 222Rn makes the highest contribution to the total effective dose.

摘要

对圣保罗州452个饮用水源中的228镭、226镭和222氡的活度浓度进行了分析。这项研究始于1994年，涵盖了574个现有县中的54%。226镭和228镭的浓度分别高达235和131毫贝克勒尔/升，而222氡的浓度达到315贝克勒尔/升。对于关键器官，分别摄入226镭、226镭和222氡时，估计辐射剂量高达0.3、0.6和3.2毫希沃特/年。对于相同的放射性核素，相应的待积有效剂量分别达到6×10⁻³、2×10⁻²和3×10⁻¹毫希沃特/年。这些结果表明，222氡对总有效剂量的贡献最大。