实践证明，混凝土起到了很好的屏蔽强射线作用，有效解决了放射性钴60这一施工难题。
The practices verify that concrete has function of shielding strong ray. Thus the construction difficult issue how to efficiently solve cobalt 60 with strong radioactivity in construction is overcome.
钴的一种放射性同位素，质子数'0，具有异常强烈的伽马射线作用，用于放射疗法、冶金和材料测试。
A radioactive isotope of cobalt with mass number '0 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.
钴的一种放射性同位素，质子数'0，具有异常强烈的伽马射线作用，用于放射疗法、冶金和材料测试。
A radioactive isotope of cobalt with mass number '0 and exceptionally intense gamma-ray activity, used in radiotherapy, metallurgy, and materials testing.
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