在實驗室所用的放射性物質之量,同常為毫居里或為居里之程度。為使用上方便計量又提出一單位,稱之為拉塞福,1拉塞福即為1×dps(disintegration per second)之放射性物質的量,通常以rd代表之。1拉塞福等於37分之一毫居里。

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