在实验室所用的放射性物质之量,同常为毫居里或为居里之程度。为使用上方便计量又提出一单位,称之为拉塞福,1拉塞福即为1×dps(disintegration per second)之放射性物质的量,通常以rd代表之。1拉塞福等于37分之一毫居里。

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