Anecdotes

["dama" <dama@waterw.com>]

I don't want to sound like a spoil sport, stick-in-the-mud, etc., but 
the scenario that you described would have resulted in disciplinary 
action at the nuclear power plant where I work and deal with real 
incidents on a daily basis.  The NRC has levied violations for 
similar pranks, e.g., someone placed a Sr-90 source in a co-workers 
back pocket which the individual subsequently wore for part of their 
shift.

Though there was no exposure in excess of federal or administrative 
limits, the licensee was cited for failure to control licensed 
material, inadequate surveys, etc.

I have been in this field for about 25 years and have had similar 
"tricks" played on me.  I will try and post some of the ones that I 
remember.
Dave Ruyter

dama@waterw.com