为了探测质子衰变放射性的假想形式，人们修建了巨大的探测器，但这些探测器从没发现这种东西。
Giant detectors built to look for a hypothetical form of radioactivity in which protons decay never found such a thing.
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.
在一个同位素的原子中中子数减去质子数，同位数是放射性的指示。
The number of neutrons minus the number of protons in the atom of an isotope. isotopic number is an indication of radioactivity.
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