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 " -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to neonixie-l+unsubscr...@googlegroups.com. To post to this group, send an email to neonixie-l@googlegroups.com. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/A4962A5F6A8B41E887500F1A01D59727%40compunet4f9da9. For more options, visit https://groups.google.com/d/optout.