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天然放射性是全世界人口集体剂量的主要贡献者,也是人类食品中放射性核素的主要成分,人工放射性污染只增加了很少部分。天然存在的放射性核素,除氡、(?)及其子体外,主
Natural radioactivity is a major contributor to the collective dose of population throughout the world and is also a major component of radionuclides in human food, with only a minor increase of artificial radioactive contamination. Naturally occurring radionuclides, except radon, (?) And its progeny, the Lord