Sorry, that earlier post just posted itself before I finished :-)

So:-
I saw this post by Joe Sousa over at TCA Group. Mailed him about posting here 
but no reply (yet). Joe was a member of the Yahoo Group, no idea if he still 
follows now.

John K
Australia.

Joe's post........
"I have surveyed my collection of Philbrick K2-W, K2-X, K2-XA OPAMP modules for 
signs of radiation. These are all in plastic shells. The black modules and 
beige modules all have neon bulbs with a dab of radium paint. None of the newer 
gray plastic modules showed signs of radiation.  

None of the aluminum case tube opamps, like the SK-2V showed signs of radiation.


See the results of my survey of radiation in philbrick modules at 
http://philbrickarchive.org/geiger_counter_beta-2.pdf

This PDF also includes details for a Geiger detector pancake cell with a mica 
window that lets alpha particles through. The radiation does drop when the 
plastic case covers the radium paint on the neons.


email exchanges on this topic at
http://www.philbrickarchive.org/radium_paint_on_neons.htm

http://www.philbrickarchive.org/radio-active_neon_bulb.htm    "

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