What you are seeing are the characteristic x-rays associated with the decay of 137-Cs to 137-Ba. There are two x-rays in the 30 keV range, 32.8 and 32.2 keV respectively.
>>> John Lam <lamhc@hkusua.hku.hk> 04/29 9:53 AM >>>
In using MCA, I have no reference source below Cs109(88keV), but noticed
that gamma peaks occur at 76keV and 33keV when Cs137 & Co60 are put inside
the well counter? I'm sure that 76keV is coming from K-alpha of Pb (lead)
but are not quite sure whether it is really from Iodine. Since from
literature and textbook , 28keV is for the iodine escape peak. Can anybody
tell me where does the 33keV come from ?
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