Re: I-125 gamma constant

["Dean Broga, Director, OEHS" <BROGA@Gems.VCU.EDU>]

One issue that continues to arise with I-125 and exposure is the x-
ray component.  The pure gamma component of 0.07 takes into account
only the 35.5 keV gamma with its 6.5% yield.  There is a 136% yield
of k-alpha x-rays with energies from 27.2-31 keV which will effect
the measured exposure and are considerred in the ionization
constant.  These terms are often missused and create confusion.

Dean W. Broga
Medical College of Virginia Campus
Virginia Commonwealth University