On 02/10/2014 09:32 AM, Tidak Ada wrote: > But Ra228 will be more efficient in this case, for it is a ß-radiator. > However, it only has an half life of 69 months.
Actually no. Ra-226 in equilibrium with its decay chain is an "everything emitter". It was widely used in tubes such as radar T/R switchs before cheaper and cleaner isotopes became available. The most common is Ni-63 with a 100 year half-life. I have a 1st Gulf War vintage nerve gas detector that uses Ni-63 and of course the venerable Krytron. I've never heard of it being used in a display tube. Kr-85, being a gas, is much easier to license and handle than any solid isotope. John -- John DeArmond Tellico Plains, Occupied TN http://www.fluxeon.com <-- THE source for induction heaters http://www.neon-john.com <-- email from here http://www.johndearmond.com <-- Best damned Blog on the net 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/52F8EFF0.1090300%40neon-john.com. For more options, visit https://groups.google.com/groups/opt_out.
