RE: specific activity

["Bandini, Tara" <tara.bandini@rcp.dph.state.ma.us>]

It's the basic activity equation, A = lambda * N, where A is specific
activity, lambda is the decay constant, and N is the number of atoms per
gram.

Lambda = (ln 2) / half-life

N = (Avogadro's Number of atoms / mole) * (1 mole / X grams) * [1 uCi / (3.7
E 4 d/s)]

In this instance the half-life must be expressed in seconds.


Tara M. Bandini
Massachusetts Radiation Control Program
Voice:  617.727.6214 x 2018
Fax:     617.727.2098
Pager:  800.366.2337 x 11786
tara.bandini@rcp.dph.state.ma.us <mailto:Tara.bandini@state.ma.us> 

		-----Original Message-----
		From:	kathy smith [mailto:kathysmith1963@hotmail.com]
		Sent:	Wednesday, June 14, 2000 1:49 PM
		To:	Multiple recipients of list
		Subject:	specific activity

		how does one go about determining the specific activity of
something in 
		uCi/g ?
	
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