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Tuesday, October 7, 2008

Fundamentals: Activity and number of atoms, N

If the activity of a source like uranium 238 is known , A. The number of Uranium 238 atoms present can be calculated using A =/\ N. The mass of uranium can be calculated using mass = 238 u x N. There is no need to take 238.02376 u (5dec place) , just 238 can do.