RE: specific activity

["Bradshaw, Keith" <Keith.Bradshaw@nnc.co.uk>]

I've derived this simple equation:

mass for 1Bq (g) = 2.396E-24 * half-life (s) * molar mass (g/mole)

This agrees with listings in the literature.

So for example, Th-228 (half-life = 1.913 year)

2.396E-24 * 60370000 s * 228 g/mol = 3.298E-14 g/Bq

The specific activity in Bq/g is then 1/3.298E-14 = 3.03E+13 Bq/g

Since 1 microcurie = 37000 Bq

3.03E+13/37000 = 819 000 000 microcurie/g

> -----Original Message-----
> From:	kathy smith [SMTP:kathysmith1963@hotmail.com]
> Sent:	Wednesday, June 14, 2000 6:47 PM
> To:	Multiple recipients of list
> Subject:	specific activity
> 
> how does one go about determining the specific activity of something in 
> uCi/g ?
> 
	Personal views only

	Regards

	keith.bradshaw@nnc.co.uk

	END










	END


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