Search found 19 matches

by miree
21 May 2019, 20:56
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1289

Re: Fukushima Soil

So the simple conclusion is: that it will not be possible without the use of a special high resolution crystal to really separate these two peaks, so just a small bump on the edge is all you can detect. Luuk Yeah, after a 18 hours measurement + roughly as much for background I know by now that that...
by miree
18 Feb 2019, 05:54
Forum: Detector drivers
Topic: new version of dynamic time over threshold (work in progress)
Replies: 1
Views: 484

new version of dynamic time over threshold (work in progress)

Hello everybody, week-end is ending and I wanted to show my progress in improving my dynamic time over threshold device that I've shown previously: https://www.gammaspectacular.com/phpBB3/viewtopic.php?f=15&t=366#p1735 Some points that I'm trying to improve: The old device needs a third party FPGA b...
by miree
08 Feb 2019, 03:01
Forum: General discussion
Topic: Compton Scatter Experiment
Replies: 5
Views: 921

Re: Compton Scatter Experiment

Hi Steven, the setup looks quite nice! I think such a setup could also be use to measure gamma-gamm angular correlations (the change in the coincidence count rate of two detectors, if the angle detector1-source-detector2 is changed). One can see two GS-USB-PRO in the picture, and I'm wondering how w...
by miree
12 Nov 2018, 04:13
Forum: Detectors
Topic: CZT Detector help
Replies: 3
Views: 1187

Re: CZT Detector help

Hello I have a similar detector from the same source since quite a while but never got the time to build a readout for it. So I never recorded a spectrum (still on my to do list though). But I tested it starting at 0V and increased voltage until I saw pulses. They started coming at around 90V. I bel...
by miree
15 Aug 2018, 04:44
Forum: Spectrum
Topic: Another Fukushima soil sample (with coincidences)
Replies: 5
Views: 1969

Re: Another Fukushima soil sample (with coincidences)

Ah! I can post again :)
Cs-134-coincidence-matrix.png
Michael
by miree
15 Aug 2018, 04:40
Forum: Spectrum
Topic: Another Fukushima soil sample (with coincidences)
Replies: 5
Views: 1969

Re: Another Fukushima soil sample (with coincidences)

Hi Alain,

I don't know what happened to the pictures, I'll try to re-post them. And I was affected by the forum login issue and couldn't do it earlier.

Michael
by miree
27 May 2018, 03:45
Forum: Detectors
Topic: Single channel analyzer
Replies: 10
Views: 4290

Re: Single channel analyzer

Hello John This website might be useful: http://www.nndc.bnl.gov/chart/chartNuc.jsp You can click on any isotop and get a list of the decay radiation (appears on the bottom of the page after selecting a radioactive isotope). The page has also a link to a gamma finder (click on "Levels and Gammas" on...
by miree
05 May 2018, 04:05
Forum: Spectrum
Topic: Another Fukushima soil sample (with coincidences)
Replies: 5
Views: 1969

Another Fukushima soil sample (with coincidences)

Hello all, Luuk sent me one of his Fukushima soil samples. It is very useful for me because before I didn't have a Cs-137 sample. I can use this to better specify the resolution of my detector-DAQ combination. The following spectrum is from my new detector (also from Luuk): soil_sample_spectrum.png ...
by miree
16 Apr 2018, 04:12
Forum: Detectors
Topic: New detector and improved dynamic time-over-threshold calibration
Replies: 1
Views: 2011

New detector and improved dynamic time-over-threshold calibration

Hello everyone, I have a new detector and some improved calibration formula for the time-over-threshold data acquisition that I would like to share. The new detector is one of Luuk's 2x2'' NaI detectors from his recent offering in the forum. He sent me a number of reference spectra with different so...