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半衰期的長短與核素的危害程度的關係是?

我個人認為:放射核素的半衰期長,它衰變的次數會少,對環境的危害自然會很小。

但有人說:若放射核素的半衰期很長,它的放射性維持是一個常量一段很長的時間,因此它們對環境的危害會持續一段很長的時間。

為什麼?

1 個解答

評分
  • 天同
    Lv 7
    9 年前
    最愛解答

    The hazard of radioactive substances to the environment depends on two factors, half-life and activity.

    Radioactive substances with high activity and long half-life causes the most hazard. The reason is apparent, as the substnace persist long in the environment.

    Although radioactive substances with short half-life could decay in a short period of time, short half-life high activity substances still could bring much hazard. An example is iodine-131 (half-life 8 days), which is a substance that is released after a nuclear power plant accident. Most of the doses that incurred to the public after the nuclear accident at Chernobyle or Three-Mile Island did come from iodine-131.

    Substances with long half-life but very low activity would bring minimal hazard. Examples are carbon-14 in the natural environment, or potasium-40 in our body.

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