Gamma Spectrometry Forum

Hello Lars, I can't contribute much to the factors. Pictured is my 2" NaI crystal. The Gottow soil sample is 5cm in diameter and 1cm high. This sample, in a plastic container, lies directly on the crystal. The thickness of the Al layer is unknown. The sample is said to be natural uranium. The 2...

The background to my question is that I am looking for a way to examine samples for the ratio of U235 / U238. I've now found a report. However, it's still missing the efficiency function of the NaI crystal. But the first results are already quite useful. https://physicsopenlab.org/2017/06/30/gamma-a...

Hello,
what I need is the efficiency only for NaI in the range from 50 - 400 keV.

Hello,
I'm looking for a function that calculates the effectiveness of a NaI scintillator from energy. The range is 50–300 keV. The crystal is 2" x 2". Is there a link to this?

Peter

Hello, I have two colored glasses from Schott Mainz. Both glasses are labeled "Uranium Containing." The glasses are identical in size, 40x40x3mm. My question: why do the spectra at 63 keV differ so much? Natural uranium or depleted uranium? Are there any other explanations? https://i.posti...

The same formula can also be found in Fünfer-Neunert "Counting tubes and scintillation counters" 1945.

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.

I also measured La138 a few months ago. It was 100 grams of La oxide. I could only see the 2 lines of La138. Peter

Hello,
for a comparison I have my Am241 spectrum with a 2 "NaI crystal and a EMI PMT.
Peter

Thank you for the information. now i have also seen the law of decay in a large list. Peter