Re: Sr-90 questions

[Gv1@aol.com]

Many people use a depleted uranium slab for determining ion chamber beta 
correction factors during calibration.  The beta spectrum coming from the 
slab has many emssions and with a high average energy.  The Sr-90 beta 
emission spectrum is the best single isotope for approximating the average 
energy of depleted uranium.  The large amount of energy/uCi means that higher 
ranges of ion chambers can be soruce checks with moderate curie amounts.  
There are existing source check jigs that can range from 2 - 35000 mR/hr with 
a single source and multiple filters.

Glen Vickers
glen.vickers@exeloncorp.com