摘要
目的 探讨广东省饮用天然矿泉水源水中天然放射性核素浓度及所致居民剂量。方法 采用射气法、固体荧光光度法、分光光度法、原子吸收分光光度法、闪烁室法分别测定矿泉水中天然放射性核素。结果 矿泉水源水中2 2 6 Ra、天然铀、天然钍、40 K、氡含量的均值分别为 68 6mBq·L-1、2 14 μg·L-1、0 65 μg·L-1、0 199Bq·L-1、2 0 9 8Bq·L-1;饮用天然矿泉水摄入放射性核素所致待积有效剂量为 0 93 2mSv·a-1;其中氡所致剂量为 0 919mSv·a-1,约占总待积剂量的99 %。结论 矿泉水作为日常饮用水的群体所致待积剂量要比正常本底地区公众增加 2～ 3倍的附加剂量 ;已接近长期持续受照剂量限值。
Objective\ To research the contents of natural radionuclides in mineral water and their internal dose to residents of Guangdong Province. Methods\ Spectrophotofluorometry,spectrophotometry,atomic absorption spectrophotometry and scintillation chamber method were used to determine the radionuclides in mineral water. Results The mean concentration of 226 Ra, natural uranium,natural thorium, 40 K,and radon in mineral water were 68 6 mBq·L -1 ,2 14 μg·L -1 、0 65 μg·L -1 ,0 199 Bq·L -1 and 209 8 Bq·L -1 , respectively.The committed equivalent dose resulting from ingesting natural radionuclides in mineral water was estimated to be 0 932 mSv·a -1 ,and the dose caused by intake of radon was 0 919 mSv·a -1 ,accounting for approximately 99 per cent of the total dose. Conclusion The dose contributed by drinking mineral water is triple or quadruple that by public exposure in normal background areas, and is close to the annual dose limits of continuous and long term exposure.\;
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2000年第2期132-135,共4页
Chinese Journal of Radiological Medicine and Protection
