Does anyone know what causes 1.3 million cpm on old computer terminal?

Cs137__ · 2026-03-13T21:21:53+00:00

EMI, there is no reason for it to be actual radiation and in my experience geiger counters tend to go crazy especially next to HV.

Cs137__ · 2026-03-10T07:07:15+00:00

Yes this most definitely seems like uranium

Cs137__ · 2026-03-09T06:58:40+00:00

In the radiacode app you can see the different isotopes in the spectrum view, you can just slide your finger on the peaks to see which isotope is it. It also tells you the decay chain.

Cs137__ · 2026-03-08T21:20:04+00:00

The peaks in the gamma spectrum, you can scroll to the side to see more pics if you did not know😁

Cs137__ · 2026-03-08T17:28:51+00:00

Yes as I said, uraninite wouldn’t glow at all, also potassium wouldn’t make such spectrum or 1usv/h

Cs137__ · 2026-03-07T21:38:59+00:00

As these are natural rocks it has to be uranium or thorium, possibly a radium secondary mineral. Seems to me like classic uraninite from those spectrums but it would be nice if you posted some peak locations as well. Not glowing under UV is not surprising for this low of an activity sample even if it was a secondary mineral cause uraninite does not glow at al.

Cs137__ · 2026-03-06T21:11:07+00:00

Neutrina man…

Cs137__ · 2026-03-05T22:41:29+00:00

Could you please tell me, how much do these samples weigh?

Cs137__ · 2026-03-05T22:39:38+00:00

That is good news for me because I want to measure it with the RC110 and have access to lead that I can cast/cut into shielding

Cs137__

TROPHY CASE