Search found 184 matches

by Go-Figure
03 Jun 2020, 01:50
Forum: Spectrum
Topic: Uranocircite from Andalusia, Spain. With Shielding This Time
Replies: 0
Views: 26

Uranocircite from Andalusia, Spain. With Shielding This Time

Hello there, In the past few days a gave a “better look” to a sample I tested back in September when I still had no shield whatsoever, it’s Uranocircite from Andalusia, Spain. You can read about that first test here https://www.gammaspectacular.com/phpBB3/viewtopic.php?f=5&t=633 The sample is very w...
by Go-Figure
28 May 2020, 17:32
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

Hi Sparky, I just bought some more pewter which will allow me to double its thickness in my graded shield, so my next attempt will be with about 9 mm of pewter instead of 4-5 mm, that should further reduce fluorescence and it'll be interesting to compare results between spectra recorded with the two...
by Go-Figure
25 May 2020, 19:53
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

You are the king of the long measurements (and patience), Massimo! Maybe you can this way determine the optimal test period for these samples in your conditions, a good balance between time and result quality ;) One thing I learned, initially my focus was mainly in the accumulation time with the sa...
by Go-Figure
24 May 2020, 20:05
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

A promise is a promise....this is the result of my latest Trinitite measurement. The sample is the same “type 5” about which I already posted two different spectra, so this is the third one. This time it’s a 28 days measurement: 7 days of shielded background. 14 days with the sample inside the shiel...
by Go-Figure
24 May 2020, 19:51
Forum: Spectrum
Topic: A Tale of Triple Trinitite
Replies: 7
Views: 148

Re: A Tale of Triple Trinitite

Questions are great! I have a thread about my shield upgrade project, this post shows my current setup: https://www.gammaspectacular.com/phpBB3/viewtopic.php?f=10&t=805#p3777 Normal unshielded background is 125 cps with my detector. My early shield (used for JC-TR-01) got that down to about 25 cps....
by Go-Figure
24 May 2020, 19:03
Forum: Spectrum
Topic: Autunite from Nevada
Replies: 6
Views: 356

Re: Autunite from Nevada

Nice study and interesting to know, Massimo. I also thought the XRF contribution is greater. The 5 mm of pewter added to my shielding really do a good job in limiting the incidence of XRF and I am in the process to add some more. I think most of the increase on the low end is back-scatter noise, in...
by Go-Figure
24 May 2020, 18:49
Forum: Spectrum
Topic: A Tale of Triple Trinitite
Replies: 7
Views: 148

Re: A Tale of Triple Trinitite

Trinitite is always great to test, I found so much variety from one sample to the othee that I never really know what to expect before starting with a new one. I'd like to ask a few questions to understand the results better: Can you share some detail about your shielding setup? How many CPS your sa...
by Go-Figure
24 May 2020, 18:36
Forum: Spectrum
Topic: Alphaspec of Ra226
Replies: 7
Views: 172

Re: Alphaspec of Ra226

This is really something Peter,
Alpha spectroscopy is something that's been in the back of my mind for a while now, thank you for this post.

Massimo
by Go-Figure
17 May 2020, 20:37
Forum: Spectrum
Topic: Autunite from Nevada
Replies: 6
Views: 356

Re: Autunite from Nevada

Hello there, This is the second post about my “Autunite from Nevada” test. Why doing another post about it? Because I wanted to do a comparison of a shielded and an unshielded measurement of the same sample, both with background subtraction. When I started doing gamma spectroscopy it took me about s...
by Go-Figure
17 May 2020, 20:04
Forum: Spectrum
Topic: My first Mystery Source (Ra226)
Replies: 12
Views: 912

Re: My first Mystery Source (Ra226)

Hi Mike. A mistery source is always a lot of fun! Looking at the spectrum, Ra226 is definitely there. Problem is Ra226 gamma spectrum only differs from U238 for the two Th234 at 63 keV and 92 keV and it's very easy to miss them. I tested a few uranium ores where those two peaks were completely burie...