^（90）Sr对衡阳地区大米及谷壳的总β放射性的贡献率

人们通过食用稻米,导致放射性物质进入体内。^90Sr是核裂变的产物,以气溶胶的形式沉降,它在人体中参与钙的代谢过程进入骨骸,难以排除体外。对衡阳地区10个水稻品种的^90Sr对大米及谷壳的总β放射性的贡献率进行了实验研究,得到^90Sr对大米的总β放射性的平均贡献率为：9.6%±6.2%;^90Sr对谷壳的总β放射性的平均贡献率为：24.1%±12.2%。提出谷壳、稻杆、牧草等饲料由于对放射性气溶胶的截获效应具有较高的^90Sr含量,其在动物体内骨骼上可能进一步富集,对人类的危害性有待进一步研究。

The Contribution Rate of ^90Sr on the Rice and Chaff Total β Radioactivity in Hengyang

The radioactive substances can be brought into human body by eating rice, and ^90Sr is a by-product of nuclear fission which is found in nuclear fallout and presents a health problem since it substitutes for calcium in bone, preventing expulsion from the body. We conducted the experimental study on the contribution of ^90Sr on the rice and chaff total β radioactivity of 10 kinds paddy in different parts of Hengyang. We found out that the average contribution rate of ^90Sr β radiation on the rice total radiation is 9.6%± 6.2 %; and the average contribution rate of 90 Sr β radiation on the chaff total β radiation is 24.1%± 12.2 %. It is proposed that the ^90 Sr content in chaff, straw, grass and other forage may be high for the intercepted effect of the radioactive aerosol. The ^90 Sr will be rich in the bones of animals for human consumption. Its harm to human needs further study.