Back in the late 1970's, I purchased an old ARC-44 radio that came with a warning about Cobalt-60. Seems the 5829/WA and 5787/WA tubes contained Cobalt-60. However, with a half life of 5.3 years, the tubes showed no activity on a Geiger counter. By the time I got the radio as surplus, three half-lives had already passed.
On Monday, October 26, 2020 at 6:53:14 PM UTC-4 Pramanicin wrote: > I received a box of dekatrons a couple years ago where some of them had > radioactive labels on the boxes. Just standard GC10B's, so not sure what > the label was warning me of, alas I don't have a geiger counter, but maybe > I should get hold of one! > > On Mon, Oct 26, 2020 at 3:35 PM Paul Andrews <[email protected]> wrote: > >> Mine is a GK Mini with a SBM20 tube. Background with it is about 20 CPM. >> >> On Oct 26, 2020, at 6:12 PM, Mac Doktor <[email protected]> wrote: >> >> >> >> On Oct 26, 2020, at 5:35 PM, Nick Andrews <[email protected]> wrote: >> >> Haha, the radium is the one that makes me nervous. Tritium, Kr, etc not >> so much! Just watched Radioactive on Amazon (I think) about Marie Curie. >> A little slow but not bad. >> >> >> I read somewhere that the Curies would go out to their workshop after >> dark and just stand there watching the entire room glow. There were glowing >> rings on the shelves where bottles had been sitting at some time in the >> past, who knows how long ago. >> >> >> On Oct 26, 2020, at 6:00 PM, Paul Andrews <[email protected]> wrote: >> >> I have a couple of old alarm clocks with radium dials. My Geiger counter >> goes crazy when it’s next to them. >> >> I also have some Uranium glass glasses and was surprised to get about >> 20-30 times background off of them. >> >> >> What kind of GM tube is in it? My entry-level scintillator gives me a >> background of ~1150CPM at 900V. >> >> >> My dad had prostate cancer a while back. They implanted something with a >> half-life of two or three weeks. I checked him every half-life to confirm >> that the count had in fact decreased exactly 50%. 8D >> >> >> Terry Bowman, KA4HJH >> "The Mac Doctor" >> >> Q: Should car stereo speakers be pointed to the rear for more thrust or >> up for more traction? >> >> A. On long trips, the 20- to 30% improvement in gas mileage you might get >> with speakers pointing to the rear is certainly worthwhile. On the other >> hand, if you drive on snow or ice, the extra traction of speakers pointing >> upward gives you added control. >> >> Don Lancaster >> >> -- >> You received this message because you are subscribed to a topic in the >> Google Groups "neonixie-l" group. >> To unsubscribe from this topic, visit >> https://groups.google.com/d/topic/neonixie-l/BL83MEnFSbA/unsubscribe. >> To unsubscribe from this group and all its topics, send an email to >> [email protected]. >> To view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/A1A1E624-DE2B-4946-942D-58D48D37EA53%40gmail.com >> >> <https://groups.google.com/d/msgid/neonixie-l/A1A1E624-DE2B-4946-942D-58D48D37EA53%40gmail.com?utm_medium=email&utm_source=footer> >> . >> >> -- >> > 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 view this discussion on the web, visit >> https://groups.google.com/d/msgid/neonixie-l/9269EE17-C181-47C9-BAED-EFEAE9ACAA5F%40gmail.com >> >> <https://groups.google.com/d/msgid/neonixie-l/9269EE17-C181-47C9-BAED-EFEAE9ACAA5F%40gmail.com?utm_medium=email&utm_source=footer> >> . >> > -- 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 view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/00a5beaa-e143-4820-8c9d-a81f6ff25712n%40googlegroups.com.
