Search found 165 matches

by Peter-1
05 Mar 2022, 01:02
Forum: Detectors
Topic: 2*pi vs 4*pi
Replies: 7
Views: 1756

Re: 2*pi vs 4*pi

The same formula can also be found in Fünfer-Neunert "Counting tubes and scintillation counters" 1945.
by Peter-1
23 Feb 2022, 08:46
Forum: Spectrum
Topic: PMT give light !
Replies: 6
Views: 1400

Re: PMT give light !

If you solder something directly to the pins of a PMT, microcracks can appear in the glass and air can slowly penetrate. Never solder directly to a PMT.
by Peter-1
08 Nov 2021, 01:08
Forum: Spectrum
Topic: Clean ¹³⁸La
Replies: 1
Views: 672

Re: Clean ¹³⁸La

I also measured La138 a few months ago. It was 100 grams of La oxide. I could only see the 2 lines of La138.
2021_02_07-Lanthanoxid.png
Peter
by Peter-1
01 Aug 2021, 18:41
Forum: Spectrum
Topic: XRF on a gamma spectrometer!
Replies: 13
Views: 2845

Re: XRF on a gamma spectrometer!

Hello,
for a comparison I have my Am241 spectrum with a 2 "NaI crystal and a EMI PMT.
Peter
by Peter-1
30 Nov 2020, 23:33
Forum: Spectrum
Topic: Calibrate the energy
Replies: 4
Views: 2575

Re: Calibrate the energy

Thank you for the information. now i have also seen the law of decay in a large list.
Co56.jpg
Peter
by Peter-1
30 Nov 2020, 00:43
Forum: Spectrum
Topic: Calibrate the energy
Replies: 4
Views: 2575

Calibrate the energy

Hello,
I like to use a thorium sample to calibrate the energy in my program. Unfortunately, this only works up to 2614 keV. My question: is there still an isotope that can be used in even higher energy ranges?
regards
Peter
by Peter-1
05 Nov 2020, 03:45
Forum: Spectrum
Topic: Uranium-radium decay
Replies: 3
Views: 2335

Re: Uranium-radium decay

hello Mike,

my first spectra of soil samples were in Sept. 25, 2019. The title: soil sample

Peter
by Peter-1
04 Nov 2020, 02:28
Forum: Spectrum
Topic: Uranium-radium decay
Replies: 3
Views: 2335

Uranium-radium decay

I am looking for help and explanation! During some measurements of the spectrum of uranium glass, uranium compounds and the soil sample from Gottow, I made an observation that I couldn't explain. The line at 63.3 keV for Th234 varies greatly. Both in the soil sample and in a uranium glass from Schot...
by Peter-1
02 Nov 2020, 04:23
Forum: Spectrum
Topic: Potassium Chloride Salt - Radioactive Salt
Replies: 13
Views: 4404

Re: Potassium Chloride Salt - Radioactive Salt

I use a very pure salt from a pharmacy. 99.9% according to analysis. So I am sure that I really only have potassium in the sample. The spectrum shown was created with this salt. Background was 16.7 CPS, with KCl it was 32.7 CPS.
2020_10_28-KCl.png
2020_10_28-KCl.png (95.99 KiB) Viewed 4073 times
Peter
by Peter-1
19 Oct 2020, 23:17
Forum: Spectrum
Topic: Curit from the Congo
Replies: 3
Views: 2500

Re: Curit from the Congo

Hello Massimo, of course I saved the values. The total measurement time was 4.37 hours. During this time it was 395.9 CPS in total. The background rate in my system is only 16.5 CPS. The net rate of the probe is 379.4 CPS. From a measurement with a Geiger counter and taking into account the distance...