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~(90)Sr是来自核武器爆炸后的放射性落下灰及放射性废物。由于~(90)Sr具有足够长的寿命(物理半衰期约为29年),因此,不可能阻止它进入最终可能被人食入的各种食品。许多学者认为~(90)Sr代表一种在相当长的时间起作用的环境危害。为了研究生命期食入~(90)Sr的效应,作者观察了15条狗终生食入~(90)Sr的效应。方法:在15条狗的生命期每天喂以~(90)Sr,其中7条喂以0.37微居里~(90)Sr/每克食物钙(相当于每天摄入1.3微居里~(90)Sr),4条喂以1.11微居里~(90)Sr/每克食物钙(相当于4微居里~(90)Sr/天)和4条喂以3.33微居里~(90)Sr/每克食物钙(相当于12微居里~(90)Sr/天)。在研究的整个期间饮食中的放射性维持在规定的
~ (90) Sr comes from radioactive fallout and radioactive waste after the explosion of nuclear weapons. Because 90 Sr has a sufficiently long lifetime (a physical half-life of about 29 years), it is impossible to prevent it from entering various foods that may eventually be ingested by humans. Many scholars believe that ~ (90) Sr represents an environmental hazard that has worked for quite a long time. In order to study the effect of lifetime ingestion of ~ (90) Sr, the authors observed the effect of ~ (90) Sr on lifespan in 15 dogs. Methods: Fifteen dogs were fed daily with 90 Sr, seven of them were fed with 0.37 microcurrents ~ (90) Sr / g dietary calcium (equivalent to 1.3 microgresses ~ (90 ) Were fed with 1.11 microcurrents ~ (90) Sr / g dietary calcium (equivalent to 4 microcurrents ~ (90) Sr / day) and 4 fed with 3.33 microcurrents ~ (90) Sr / g dietary calcium (equivalent to 12 microcurrents ~ (90) Sr / day). The radioactivity in the diet was maintained for the entire duration of the study