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目的了解珠三角地区食入放射性核素~(238)U、~(232)Th、~(226)Ra、~(40)K所致居民内照射情况。方法检测该地区食品中~(238)U、~(232)Th、~(226)Ra、~(40)K的含量,并采用间接法估算当地标准人(成年男性)食入~(238)U、~(232)Th、~(226)Ra、~(40)K所致年待积有效剂量。结果~(238)U、~(232)Th、~(226)Ra、~(40)K所致年待积有效剂量分别为:0.0151、0.0332、0.0243、0.152 mSv·a~(-1)。结论珠三角地区~(238)U、~(232)Th、~(226)Ra所致内照射剂量明显高于全国平均水平,而~(40)K所致剂量与全国平均水平相当,考虑是由于当地的天然核素~(238)U、~(232)Th、~(226)Ra浓度较高所致。
Objective To understand the internal radiation of inhaled radionuclide ~ (238) U, ~ (232) Th, ~ (226) Ra and ~ (40) K in the Pearl River Delta region. Methods The contents of ~ (238) U, ~ (232) Th, ~ (226) Ra and ~ (40) K in the foods of this area were detected and the ingestion rates of 238 U, ~ (232) Th, ~ (226) Ra, ~ (40) K caused by the expected effective product dose. Results The effective doses of ~ (238) U, ~ (232) Th, ~ (226) Ra and ~ (40) K were 0.0151, 0.0332, 0.0243 and 0.152 mSv · a -1, respectively. Conclusion The internal dose of ~ (238) U, ~ (232) Th and ~ (226) Ra in Pearl River Delta region is significantly higher than the national average, while the dose of ~ (40) K is equivalent to the national average, considering Due to the higher concentration of ~ (238) U, ~ (232) Th and ~ (226) Ra in the local natural radionuclides,