"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
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