Radiation Detection

I also have that peak around 90-95kev (might be offset due to poor calibration at lower energies). And I have it every time I measure something of minor activity, but it's much better pronounced when I measure higher activity samples. I don't think it's from Thorium, more like XRF of some kind, pro...

Hello there, This weekend I tested a sample of Uranocircite from Andalusia, Spain. The sample is nice to look at, and shows fluorescence under UV light. So far so good. DSC06798FR.jpg DSC06805FRC.jpg DSC06825FRC.jpg As usual the Geiger counter had the first say on the activity, 536 CPM, mostly of th...

Interesting story, I didn'tknow anout that, thank you! It's still probably far less radioactive than the sand in beaches like Guarapari in Brazil for example, where there's Monazite sand, rich in Th232. People go there for the weekend not in spite of radioactivity, but because of that, albeit I am n...

Interesting, I can't help you with the mineral identification. I have a book about radioactive minerals but I am not an expert, so I could say something very very wrong. Yes, the spectrum is definitely U238-Ra226. In my experience it's unusual having peaks from Th234 and no X-rays from Pb214 when te...

If the peak around 1130KeV is from Protactinium-234 (1001 KeV), then there is nonlinearity and only the first half of the scale fits the calibration. Longer recording would be of coarse better, but what is your opinion on that? I also see that the HV supply is higher than the others posted above, b...

You are welcome Janni, In my experience changing the spectrum calibration has no impact at all on the dose rate, just as changing the calibration which determins the doserate doesn't have any effect on the spectrum. Anyway in order to compare CPS and doserate of two measurements the best way is to r...

were there many people at the movie? I am always wondering if there is measurably higher gammas from the K40 in a crowd of people.... The room was about half full, and the movie didn't deserve anything better than that. I wouldn't know if you can actually measure K40 contribution from people in the...

Ok guys I did the comparative test. I wanted a hot sample for this one in order to have a lot of counts and have significant results with a 999 seconds measurement. So I used the hottest sample I have, not an uranium or thorium ore, but a camera lens (you can read about the lens here , it was one of...

I post mine again since the images above for some reason are not clearly readable I see my cps per µSv/h are higher than Ciro's for Cesium, lower for Americium and the same for Cobalt. So there are two diferences going in opposite directions, hence partially compensating each other. I am not keen in...

Hi Janni, First, thanks for the photos of the inside. If two identical detectors give such different results testing the same sample one is clearly out of calibration. The only menus where you can do something about it I can think of are the ones below, which both show the same values of cps per µSv...