Not of direct help but I remember in the 60s on the main force we were told not to wipe the skin of the aircraft. There had been many atmospheric tests, not just in the southern hemisphere, and the aircraft were all believed to be hot because of the high altitude flying.
I seem to recall that the groundcrew wore those dosimeter tags.
I agree about the washdown however. We asked about dosimeters ourselves and were told there was no issue with cabin air or radar emissions. We were not convinced as all ATCers wore them.