Hivac used to add a little to some of their tubes - I learned this 40 years ago from one of their R&D engineers. Actually I wasn't sure if it was Kr85 or Radon, but radon has a shorter half life.
As a practical matter, when I made my trigger clock with over a hundred Hivac XC17 trigger tubes, some of them stubbornly refused to strike unless they were brightly illuminated, preferably with UV. It made it pretty useless, as it would run all day and then at dusk the rings would stop counting and stick. I guess the tubes were between a 1/16 life and a 1/32 life by the time I got them. On Thursday, February 6, 2014 1:44:35 AM UTC-8, Nick wrote: > > Bell Systems Practice document #024-723-801-I2, February 1983 > > This covered tubes such as the 122P224 / B-5092A which had a tiny amount > of Kr85 added - half life is just under 11 years, so these tubes now only > have an even more minuscule amount left (if any)... > > Nick > -- 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 [email protected]. To post to this group, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/18560e29-6917-4dbb-aad5-62d65082fe82%40googlegroups.com. For more options, visit https://groups.google.com/groups/opt_out.
