I researched this spectrum for another forum but thought you might be interested. I had never heard of Pb-210 (radiolead) as a source, so it was initially a little challenging. Rather a little project, but still pretty cool!
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Peter, the most common layered lead castles consist of lead, then lead-free pewter, and copper on the inside. I cannot help you with the optimum thickness of each. My constraints for a lead castle are weight (since I move mine around) and cost - both pewter and copper sheeting is a little expensive....
Peter, the shielding sounds good. If you look at the sample gamma spectra on Steven's web site, and a couple that I have attached, your spectrum looks good. However, I do not know the cause of the peaks below 300 keV. If you Google K-40 gamma spectrum and look at the pictures, they all look similar....
A friend gave me a little crystal labeled thorite a few days ago, and since we have been identifying thorite at a few of the mines in the Petaca district here in NM, I figured to include a spectra of it for the record. Well, it did not look like thorite from the spectra! I compared the spectra to a ...
- 23 Feb 2016, 14:47
- Forum: Resources
- Topic: Efficiency Calculations for Selected Scintillators
- Replies: 1
- Views: 2874
Attached is a very handy document provided by Saint-Gobain that answers many questions about the efficiency of a variety of scintillation materials. Topics covered include detector counting efficiency, photopeak efficiency, and gamma and x-ray absorption efficiency of different scintillators.
Lodovico, that is really a nice spectrum and set up. How long did it take you to acquire it? I used a 40x40 mm probe with 100g of the metal, and it took about 5 hours! I was originally under the impression that the only impurity in lanthanum was Ac-227 and it's daughters, but it does look like the T...
- 09 Aug 2015, 04:32
- Forum: Spectrum
- Topic: Photo peak duplication when the source is on the side of the scintillator
- Replies: 11
- Views: 4383
Hello folks! This is a topic in the "sad but true" category. I have attached graphs from the defective crystals I have encountered over the years, including one featuring the double peak. What is most unfortunate is that the sealed probe here was the first one I used for gamma spec, and spent many m...
Pieter, thank you for noticing that, I did also. The Theremino program uses a recursive deconvolution algorithm and I suspect that is the reason for the unusually sharp peak at 1001 keV and also the noise. Additionally, I reduced the peak equalizers in the program for all energy levels other than th...