Re: Cross Post: Radioactivity in Watches?

[mikeg@SLAC.Stanford.EDU (Michael P. Grissom)]

My first (and only so far) hot watch was a Sieko, I was walking 
through the portal to a controlled area in a Nuclear Support 
Facility when it was discovered.  I believe they got in the 
vicinity of 1,000 CPM or more using the Navy's DT-304PDR thin window
pancake G-M probe.  It was not radium (passed the back of the watch
test), but the assessment at the time was that it was probably 
tritium (not sure Pm-147 was being used then yet).  Anyway, I 
understand the Navy exchange stopped selling that particular model 
of Sieko at certain facilities!

>Pm-147 is probably the most likely candidate, but tritium has
>been used in some relatively modern watches.  I do not know
>if tritium is still in use.  Pm-147 is used much as radium was
>Dale E. Boyce
>dale@radpro.uchicago.edu

This is an observation and not an opinion!  Also, am I the only one
who got 3 or so messages from Ted with no content?
     Michael P. Grissom                                                   
     Asst to the Dir (ESH) for Env/RadProt/WasteMan            
     Stanford Linear Accelerator Center                         
     MS-84
     2575 Sand Hill Road
     Menlo Park, CA 94025-7015
     Phone:  415-926-2346
     Fax:    415-926-3030
     mikeg@slac.stanford.edu