本题目来源于试卷: Nuclear Physics and Radioactivity，类别为 IB物理学
[问答题]
Strontium-90 is produced as a nuclea5n8 zw ,blq2gup5f:mar fission oa 85kqynb:rn dggtp1 92/8brproduct of uranium in both reactors and atomic bombs. Look at its location in the periodic table to see what other elements it might be similar to ch8obtn2db p/gqra89 gk51n :r yemically, and tell why you think it might be dangerous to ingest. It has too many neutrons, and it decays with a half-life of about 29 yr. How long will we have to wait for the amount of $_{38}^{90}\text{Sr}$ on the Earth's surface to reach 1% of its current level, assuming no new material is scattered about? Write down the decay reaction, including the daughter nucleus. The daughter is radioactive: write down its decay.
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