[VLM]

You're probably thinking of polonium record cleaning brushes sold by staticmaster.

Its an interesting case study in planned obsolescence, the radioactive half life being only a hundred days the anti-static effectiveness of the brush would completely disappear a couple years after manufacture, requiring the purchase of yet another brush.

Electronic / ham radio people would sometimes use staticmaster brushes in the winter when soldering RF preamp FET transistors to try and eliminate transistor-destroying static charge; I was never personally a believer in that technique at least at the amateur level.

[DoofusOfDeath]

Thank you! That was driving me crazy. And now I see why I got confused: it's another phonograph-related dangerous-element fact that I learned from reading Theodore Gray's book, The Elements [0] [1].

Now if I could only remember why I thought neutron beams were involved...

[0] https://theodoregray.com/PeriodicTable/Elements/084/index.s7...

[1] https://www.amazon.com/dp/B011IZNWZU