Mastodawn

#Radiation measurements on a recent #flight I was on, it is interesting to see that immediately after takeoff, the rate drops significantly and only goes up higher again once you gain altitude. I guess it's due to the proximity to the ground and all that concrete and #rock #geology near the surface and then the #CosmicRays in the upper #atmosphere.

There was one #HighEnergy event on the next flight. Probably due to a cosmic ray.

#radiacode #science #chart #measurement #physics

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Three plus or minus five 1d ago

@LostGuppy
I’d be thinking it was an environmental effect, like cabin pressure. If you are using a PMT or Geiger those can be affected by lots of things…

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James 1d ago

@ThreeSigma Radiacode sensors (scintillation detectors) are not directly affected by air pressure changes, as they are solid-state, not gas-filled tubes like traditional Geiger counters.

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Three plus or minus five

@LostGuppy Most scintillators are read out by PMTs, or at least were until a few years ago. The multichannel avalanche photodiodes are gaining traction though.