X-rays luggage check. Cosmic radiation on airplane. Positron annihilation peak 511 keV. Radiacode.

[@The-One-and-Only100]

For a sec I thought that was 50k cpm not cps 😅

[@minhenes]

You are right it is 50 k cps. That is quite high rate. 50 kHz would be above hearing range if it was possible to listen in a speaker. On the flight back in the X-ray machine in Gothenburg got 75 k cps. Very impressive that Rafiacode can count so high rates mening that the photodiode pulses must be short.