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   gigabecquerel (gigabecquerel@chaos.social)'s status on Tuesday, 07-Jan-2025 09:00:55 JST gigabecquerel

   Here's something fun, who wants to guess what this is?

   • Embed this notice
     gigabecquerel (gigabecquerel@chaos.social)'s status on Tuesday, 07-Jan-2025 09:00:49 JST gigabecquerel

     in reply to

     It's a gamma compensated neutron ionisation chamber!
     Basically two chambers in one, sharing one electrode. One chamber is coated in boron to make it neutron sensitive, the other isn't and with some clever wiring of both chambers you can make sure the current on the shared electrode is just from neutrons, regardless of the gamma background!

     You'll typically find these very close to a reactor core, used for measuring power.

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Tuesday, 07-Jan-2025 09:00:51 JST gigabecquerel

     in reply to

     No correct guess yet.
     Here are a few more pictures:

     James Morris repeated this.
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     gigabecquerel (gigabecquerel@chaos.social)'s status on Tuesday, 07-Jan-2025 09:00:52 JST gigabecquerel

     in reply to

     Hint:
     It's made to measure one kind of radiation selectively in the presence of another kind of radiation

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Tuesday, 07-Jan-2025 09:00:53 JST gigabecquerel

     in reply to

     Definitely getting warmer!
     Hint: It is not a "counter"

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     gigabecquerel (gigabecquerel@chaos.social)'s status on Tuesday, 07-Jan-2025 09:00:54 JST gigabecquerel

     in reply to

     No correct guesses yet... none even close 😁
     Hint: One of these layers is boron coated!