[ RadSafe ] "war stories" re: SEM radiation issues?

[Ted de Castro]

Does anyone have or is able to point to ANY radiation incidents 
involving SEMs??

Considering the SEMs I've had experience with - I can't imagine such.  I 
mean low kV and low beam current less than that of the largest old CRT 
Black and White TV set!!  Also in the units I've seen the sample area 
was in vacuum contiguous with the x-ray source - thus when access is 
possible there is no vacuum and no vacuum - no x-ray - the best 
interlock possible.

So - has anyone experienced anything different??  There MUST be SOME 
reason that they require a State License.

Thanks

Ted de Castro