Re: Cross Post: Radioactivity in Watches? -Reply

[FRAMEP@ORAU.GOV]

I'd bet my favorite issue of the Health Physics journal its Pm-147.
Contrary to popular belief it does indeed have a gamma: at 121.26
keV, perfect for a low energy probe. Its rarely listed because the
intensity is 0.00285%.  But there is enough in a typical watch for
its gamma spectral peak to jump out of the compton continuum like one
of my students at the end of class.

Paul Frame
Oak Ridge Associated Universities
framep@orau.gov