Search found 15 matches

by Springdream
08 Sep 2019, 19:17
Forum: Detectors
Topic: 38B57 quantitative (food) measurents
Replies: 8
Views: 2045

Re: 38B57 quantitative (food) measurents

HI, I do not know if it was clear from my first post with the table that it allows to easily calculate the shape factor of any sample. Just draw the shape over the table (which is 1mmx1mm resulution) calculate the average of all marked fields. That is the resulting factor or your probe. Doing so you...
by Springdream
19 Nov 2018, 01:31
Forum: Detectors
Topic: 38B57 quantitative (food) measurents
Replies: 8
Views: 2045

Re: 38B57 quantitative (food) measurents

Hello Peter, thank you, but please not that this formula is for GM tubes not scintillators. There is simulation software available but no results for the 38B57 type. As I did measure the field already I can measure samples with any small shape and distance already. Anyone with the same sensor may us...
by Springdream
17 Nov 2018, 09:11
Forum: Detectors
Topic: 38B57 quantitative (food) measurents
Replies: 8
Views: 2045

Re: 38B57 quantitative (food) measurents

Hello Lodovico, thank you for your response and *wow* good essay on physicsopenlab. Regarding your formula: Ax = A ( πr2 / 4πd2 ) fγ ε the geometric factor is given as ( πr2 / 4πd2 ), but I'd say it is only valid for larger distances. At least in my case for food analysis (but as your soil sample is...
by Springdream
16 Nov 2018, 09:18
Forum: Detectors
Topic: 38B57 Scionix Technical Data & Calibration
Replies: 6
Views: 2023

Re: 38B57 Scionix Technical Data & Calibration

Hi again, Ok, again my fault: the spurious peaks resulted from limitations of my sound card input (depending on the gain needed which depends on the voltage) and not the detector or GS1100Pro. I need to go lower than 650V to get the 2614.8keV peak Ti208 properly with enough headroom to clipping due ...
by Springdream
15 Nov 2018, 06:45
Forum: Detectors
Topic: 38B57 Scionix Technical Data & Calibration
Replies: 6
Views: 2023

Re: 38B57 Scionix Technical Data & Calibration

Hello Luuk and/or Steven, regarding supply voltage: it is not that easy as described in other posts here. At the beginning I made the mistake that the line in voltage of the card (I am using a fireface UC interface that provides superior signal/noise level) was too high/saturated and hence the spect...
by Springdream
15 Nov 2018, 05:17
Forum: General discussion
Topic: Question about check sources
Replies: 18
Views: 5092

Re: Question about check sources

I'd be interested in getting some calibrated low radiation (EU conform source).
Anyone in Europe interested to sell it (maybe because there is no need anymore)?
Best,
Martin
by Springdream
15 Nov 2018, 05:11
Forum: General discussion
Topic: Monte Carlo Efficiency Calculation: Offer
Replies: 1
Views: 1401

Re: Monte Carlo Efficiency Calculation: Offer

Hi P ;-),
I did setup an efficiency field for my 38B57.
Efficiency (radius from middle 0...20mm, distance 0...100mm.
Is that something you like to match with your calculations?
Best,
Martin
by Springdream
14 Nov 2018, 07:05
Forum: Detectors
Topic: 38B57 quantitative (food) measurents
Replies: 8
Views: 2045

Re: 38B57 quantitative (food) measurents

Thanks you for the response, I like to prepare some input but need more time.
@Peter: If you are interested to get in contact with me just send me a PM.
by Springdream
13 Nov 2018, 08:22
Forum: Detectors
Topic: 38B57 quantitative (food) measurents
Replies: 8
Views: 2045

38B57 quantitative (food) measurents

Hi folks, my initial goal when stepping into gamma spectrometry was to make quantitative measurents of Cs137 in food samples (mushrooms). Actually, it was harder than expected. I got a 38B57 tube and a GS-1100 Pro together with theremino MCA. At the end I think I did it and would like to share the r...
by Springdream
13 Nov 2018, 08:00
Forum: Detectors
Topic: 38B57 Scionix Technical Data & Calibration
Replies: 6
Views: 2023

38B57 Scionix Technical Data & Calibration

Hello community, I see that many of you (and myself) are using a 38B57 from Scionix (I got mine from Tom), but there is not too much spec sheets or technical data out there (I'd say none actually). I am wondering where to get some technical data about it. Data like - PMT: do all devices use a Hamama...