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在自然界中有~(226)Ra,~(228)Ra,~(224)Ra,~(223)Ra,其中~(238)Ra是β辐射体,其余三种是α辐射体。镭具有亲骨性,经自然界的生态环节,由食品、水、大气进入人体,其80％蓄积在骨骼中(7)。~(226)Ra,~(228)Ra为极毒放射性核素。镭最大危害是可诱发骨肉瘤,所以调查食品中镭含量对制订放射性标准、内剂量调查、环境保护,卫生监督都具重要意义。
There are ~ (226) Ra, ~ (228) Ra, ~ (224) Ra, ~ (223) Ra in nature, of which ~ 238 Ra is the beta radiation and the remaining three are the alpha radiation. Radium has the pro-bony nature of the ecological links, from food, water, the atmosphere into the body, 80% of the accumulation in the bones (7). ~ (226) Ra, ~ (228) Ra is a very toxic radionuclide. The biggest danger of radium is osteosarcoma can be induced, so the investigation of radium content in food to develop radioactive standards, internal dose investigation, environmental protection, health supervision are of great significance.