conversion electrons and recoil nuclei

[FRAMEP@ORAU.GOV]

Good day

I am looking for information (especially references) about  situations
where conversion electrons appeared to be betas or contributed to beta
counts. 

I could imagine situations where pure alpha contamination appeared to
have a beta component (aside from proportional counter cross talk) and
situations where the activity of CE producing beta contamination was
overestimated.

Are there any good examples where this was a significant real world
problem? I understand that there are ways that this phenomenon can be
used to advantage but I am interested in the problems that arise.

In addition, does anyone have references that give ballpark estimates of
the contribution to alpha counts from recoil nuclei in windowless
detectors.

Thanks a bunch

Paul Frame
Professional Training Programs
ORISE
framep@orau.gov