I did leave Rn out but not unintentionally. I'm not sure enough Rn has ever been collected in one spot to fill the letters Rn. If that was possible and the contents added to the tubing, viewing the "Rn" would be your dying wish!
Of course, one could sprinkle some Pb-210 into the tube. That's the first Radon daughter with a useful half-life (about 22 years.) That would actually work pretty well, as the remaining daughters decay with either beta or alpha particles. Both are good for stimulating phosphors and neither will penetrate the glass, though a little Bremsstrahlung X-rays will be produced from the beta particles. Of course, the tube would not fill with a uniform glow. There would be bright speckles everywhere a particle of Pb-210 landed. John On 03/26/2016 01:57 PM, gregebert wrote: > I think you mean Rn (Radon), rather than Ra (Radium)..... > > -- John DeArmond Tellico Plains, Occupied TN http://www.tnduction.com <-- THE source for induction heaters http://www.neon-john.com <-- email from here http://www.johndearmond.com <-- Best damned Blog on the net https://www.etsy.com/shop/BarbraJoanOriginals <-- Affordable Fine Art Originals PGP key: wwwkeys.pgp.net: BCB68D77 -- 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/56F6D08B.40701%40neon-john.com. For more options, visit https://groups.google.com/d/optout.
