Interesting list... Perhaps you could test some AlNiCo speaker drivers to see if they are radioactive too. As the name implies, they used a small percentage of cobalt to enhance the magnetic properties of its permanent magnet. Of course they used natural cobalt (not the artificially enriched Co-60) but there still is the natural percentage of isotopes in the metal.
Gastón On Sunday, November 1, 2020 at 6:32:38 AM UTC-3 SWISSNIXIE - Jonathan F. wrote: > So here are four radioactive tubes! > The radiation was measured with Ludlum Model 3 and 44-9 probe. Background > is around 50cpm which is around 15uR/h or 0.15uSv/h. All Values are > measured directly on the tube with no distance. > > 1.) *JAN-CADK-4C35A- Hydrogen Thyratron *Containing a top of uranium > glass - Measured 500cpm (150uR/h, 1.5uSv/h) > 2.) *Western Electric 427A* - Voltage Regulator - Contained 4uCi of > Kr-85, Date-code 6639. So after 54years, probably around 0.14uCi left. - > Measured only 100cpm (30uR/h, 0.3uSvh) > 3.) *Western Electric 6141* - Voltage Regulator - Containing Ra-226, > found out by my spectroscopy. Very Hot for that small tube! - Measured > 3500cpm (1mR/h, 10uSv/h) > 4.) *Western Electric 1B22 - *Military Spark-Gap Radar Modulator - > Containing Ra-226. - Measured 12000cpm (3.63mR/h, 36uSv/h) > > No danger is posed from number 1 and 2, if the 4C35A would break, the > uranium isotope would still be contained inside the glass. And for the 427, > since Kr85 is a radioactive gas, not a solid element, it would quickly > merge with the surrounding air and become neutralized. Surely i wouldn't > crack open or break the samples 3 and 4 since Radium is dangerous, even > more since its an alpha emitter that could be dangerous when inhaling or > ingesting some material. The biggest "danger" pose this tubes when > unknown, for example if someone would dispose a huge amount of 1B22 just to > the scrap yard and the radioactive parts would get anywhere. For example, > in the USA alot of home smoke detectors use Americum-241 (what an irony ;) > ) inside them, which is a radioactive alpha emitter. There is also a > disposal problem with those, when just thrown away. Here in Switzerland the > government is still cleaning up sites of watch manufacturers that used > radium paint for watch hands in the early 1900's. For collectors of tubes, > radioactive ones do not pose a lot of danger, since collectors do not seek > to destroy them, or even know about the isotopes inside them. Ive attached > a spreadsheet with a list of radioactive tubes (not complete, no warranty) > that i found in a radiation related group, sadly i don't know the source. > Also there are alot of tubes listed there, that contained radioactive > sources only for a certain period, special type or manufacturer. For > example 12AT7 is listed there, but only very few of them contain actually > the isotopes. > Leonardo Lisa schrieb am Samstag, 31. Oktober 2020 um 19:51:27 UTC+1: > >> Please show us some pictures of the tubes! >> >> Il giorno sabato 31 ottobre 2020 alle 15:39:36 UTC+1 SWISSNIXIE - >> Jonathan F. ha scritto: >> >>> I'm also owing a few radioactive tube, specifically purchased because >>> they are! ;) >>> Don't worry about Co-60 and Kr-85 most of them had very few amounts of >>> isotopes in them, and most of them are long gone. For example the 346C >>> Tube nick mentioned, had 4.5uCi of Kr-85 in them when manufactured, this >>> would, if new (manufactured today), be inside a shipping restriction >>> indeed. You can only ship 0.27uCi Kr-85 international. But since Kr-85 has >>> a half life of around 11years most of it will be gone today if the tubes >>> are old. There are also some nixies with Kr-85, but these had lower amounts >>> in them. Sure there are some "Bad-Boys" out there that still contain >>> significant amounts of isotopes even if they are old. For example usually >>> spark-gap tubes. For example there are some 0B2WA Regulator tubes that have >>> 6uCi of Ra-226. Even if they are around 50 years old, the amount has not >>> dropped significally, since Ra-226 has 1600years of half-life. Technically, >>> they would also be forbidden to ship without proper declaration. But >>> usually everything gets trough just fine, i have purchased a few of them >>> >>> Also there is nothing to worry about the tubes as long as they are >>> intact and do not break. Actually a very save way to collect radioactive >>> items. Rocks for example are more "dangerous" since small bits and powder >>> can come off. >>> >>> If someone interested i can show pictures a few tubes ;) >>> >>> >>> >>> [email protected] schrieb am Dienstag, 27. Oktober 2020 um 16:43:46 >>> UTC+1: >>> >>>> " A scintillator? Wow! That's serious stuff! :)" >>>> >>>> Haha, you just don't have the addiction going strong (yet). I'm pretty >>>> sure I am up over 20 scint probes or parts to make them now, and let's >>>> just >>>> say quite a few G-M detectors. And the different types of scint >>>> detectors. You have plastic, NaI, CsI, CZT, BGO, etc. >>>> >>>> On Tue, Oct 27, 2020 at 10:05 AM GastonP <[email protected]> wrote: >>>> >>>>> The source I use to test my Geiger counters (actually just one, and I >>>>> switch the GM tubes) is a plastic bag with 3 NOS gas lamp mantles. They >>>>> are >>>>> quite hot. >>>>> I haven't had any luck (or perhaps that was actual luck) trying to >>>>> detect natural radioactivity at the places I have access to, so every >>>>> time >>>>> I take my Geiger counter somewhere, I have to take the mantles too just >>>>> to >>>>> show that the counter works. >>>>> >>>>> > What kind of GM tube is in it? My entry-level scintillator gives me >>>>> a background of ~1150CPM at 900V. >>>>> A scintillator? Wow! That's serious stuff! :) >>>>> >>>>> On Tuesday, October 27, 2020 at 11:24:11 AM UTC-3 Robert G. Schaffrath >>>>> wrote: >>>>> >>>>>> 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/42cfeedf-c14a-404c-8280-d137259b0072n%40googlegroups.com >>>>> >>>>> <https://groups.google.com/d/msgid/neonixie-l/42cfeedf-c14a-404c-8280-d137259b0072n%40googlegroups.com?utm_medium=email&utm_source=footer> >>>>> . >>>>> >>>> -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. 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