RE: Decay-In-Storage

["Charles Meyer" <Charles.Meyer@tdh.state.tx.us>]

> I would say that given the fact that after 7 half lives you are below 1% of
> original activity that ten half lives would be undetectable and able to be
> released with no concerns.
>

I may be getting in on this a little late, The validity of the above 
statement depends on how much you started with.  One percent of a 
hundred curies, depending on the radionuclide could still be of 
concern. 
************************************************************************
The RADSAFE Frequently Asked Questions list, archives and subscription
information can be accessed at http://www.ehs.uiuc.edu/~rad/radsafe.html