Search found 124 matches

by Go-Figure
15 Sep 2019, 23:59
Forum: Spectrum
Topic: Menzenschwand, Germany
Replies: 8
Views: 477

Re: Menzenschwand, Germany

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...
by Go-Figure
12 Sep 2019, 20:33
Forum: Detectors
Topic: Mirion PDS 100G, Spectrometric Personal Radiation Detector
Replies: 67
Views: 3594

Re: Mirion PDS 100G, Spectrometric Personal Radiation Detector

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...
by Go-Figure
10 Sep 2019, 00:20
Forum: Detectors
Topic: Mirion PDS 100G, Spectrometric Personal Radiation Detector
Replies: 67
Views: 3594

Re: Mirion PDS 100G, Spectrometric Personal Radiation Detector

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...
by Go-Figure
09 Sep 2019, 05:50
Forum: Spectrum
Topic: Tunnel
Replies: 3
Views: 263

Re: Tunnel

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...
by Go-Figure
09 Sep 2019, 02:57
Forum: Detectors
Topic: Mirion PDS 100G, Spectrometric Personal Radiation Detector
Replies: 67
Views: 3594

Re: Mirion PDS 100G, Spectrometric Personal Radiation Detector

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...
by Go-Figure
08 Sep 2019, 21:46
Forum: Detectors
Topic: Mirion PDS 100G, Spectrometric Personal Radiation Detector
Replies: 67
Views: 3594

Re: Mirion PDS 100G, Spectrometric Personal Radiation Detector

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...
by Go-Figure
08 Sep 2019, 17:51
Forum: Detectors
Topic: Mirion PDS 100G, Spectrometric Personal Radiation Detector
Replies: 67
Views: 3594

Re: Mirion PDS 100G, Spectrometric Personal Radiation Detector

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...
by Go-Figure
08 Sep 2019, 16:35
Forum: Detectors
Topic: promotion film from BNC/Scionix
Replies: 5
Views: 256

Re: promotion film from BNC/Scionix

We wanted to see you there luuk!

Thanks for sharing, it was very interesting to watch. I wonder if you ever organise guided tour what kind of free gifts you give to visitors, I saw a couple of things on the shelves I might interested in...

Massimo
by Go-Figure
05 Sep 2019, 07:48
Forum: Spectrum
Topic: Just How Radioactive St.Peter's Square Is?
Replies: 2
Views: 250

Re: Just How Radioactive St.Peter's Square Is?

Massimo, this is a really great report about St. Peter's Square. Thanks for the good documentation. Greetings Peter Thank you Peter, I live just a couple of hours from Rome. In the past I was there every weekend for personal reason, now I don't go as often anymore but I had to do this, I was curiou...
by Go-Figure
05 Sep 2019, 07:37
Forum: Spectrum
Topic: Tunnel
Replies: 3
Views: 263

Re: Tunnel

Speaking of low background. I was at the movie theatre tonight. The movie was really bad, so, when I noticed the scintillator was getting very low counts and dose rate I decided to "give meaning" to the evening and recorded a spectrum until the end. That's the lowest background I encountered so far,...