Search found 89 matches

by brehwens
10 Feb 2019, 04:43
Forum: Spectrum
Topic: Choosing BG soil
Replies: 2
Views: 554

Choosing BG soil

Hi guys As some of you might know, I am interested in doing absolute activity measurements of soil samples, looking for Cs-137. I have a few samples here at home, some of which are measured by a reference lab. Still, I have not really chosen what will be my reference soil sample for background. To o...
by brehwens
09 Feb 2019, 03:27
Forum: Software
Topic: Theremino MCA or Beqmoni ?
Replies: 12
Views: 1889

Re: Theremino MCA or Beqmoni ?

BeqMoni or PRA. To me they complement each other well and are designed for slightly different purposes. While PRA is an good all-round MCA, BM is designed to do activity calculations. To me, Theremino is just too many thing that "distort" the spectra, all kinds of strange settings just to get nice s...
by brehwens
30 Jan 2019, 08:26
Forum: Detectors
Topic: Typical energy accuracy of NaI detectors ?
Replies: 5
Views: 933

Re: Typical energy accuracy of NaI detectors ?

Very interesting to hear about the "not under 100 keV" rule, I did not know this and I have not read this previosuly. I have almost always used my Eu-152 source for calibration, and the results have been good, but I will now skip the low point of 39.9 keV which I have been using, and try the 121,8 k...
by brehwens
26 Jan 2019, 04:31
Forum: Detectors
Topic: Liquid Scintillation Counting
Replies: 6
Views: 1366

Re: Liquid Scintillation Counting

A late reply... The sample is mixed in with the scintillation fluid, in a "standard" scintillation vial that is opaque. The PMTs are not in contact with the sample. I don't really know what kind of "resolution" one can get with these kinds of detectors. My experience is only of gross counting in the...
by brehwens
25 Jan 2019, 21:06
Forum: Software
Topic: Introduction to BeqMoni
Replies: 7
Views: 3774

Re: Introduction to BeqMoni

As I understand it, the old post does not work any longer. Due to questions recieved on how to setup BM, I just post a screenshot of my settings here, to be vieiwed as a starting point. These settings need to be fine-tuned to your system, and will depend on (at least) on: *Noise of your PMT * Noise ...
by brehwens
21 Jan 2019, 07:13
Forum: Trading post
Topic: Complete NaI scintillation detector assembly
Replies: 0
Views: 665

Complete NaI scintillation detector assembly

Hi again! This time, a complete NaI detector kit is up for grabs. The PMT is a Hamamatsu R580-09 which I bought from iRad inc, and this tube is supposedly really good! "Unfortunately", I did not find a very good crystal to go with it, as I recall it only delivered 8% FWHM @ 662 keV, but as the detec...
by brehwens
12 Jan 2018, 08:49
Forum: Detectors
Topic: How to hook up this CsI crystal?
Replies: 5
Views: 3872

Re: How to hook up this CsI crystal?

..and I still can't get the image to upload....

I'll try a PM instead...
by brehwens
12 Jan 2018, 08:41
Forum: Detectors
Topic: How to hook up this CsI crystal?
Replies: 5
Views: 3872

Re: How to hook up this CsI crystal?

Oh sorry.. I have some technical issues with the image upload...

/Karl
by brehwens
02 Jan 2018, 10:54
Forum: Detectors
Topic: How to hook up this CsI crystal?
Replies: 5
Views: 3872

Re: How to hook up this CsI crystal?

Hi

Sure, here is a picture including the circuit board.

I am looking to selling this detector+card, if anyone is interested.

/Karl
by brehwens
04 Nov 2017, 10:43
Forum: Detectors
Topic: How to hook up this CsI crystal?
Replies: 5
Views: 3872

How to hook up this CsI crystal?

Hi guys! I know I have been absent on the forum.... can't find the time at the moment to play around with my toys.... I was cleaning in my hobby room, and found an old Ebay purchase that I never really got around to testing. It is a Rae Systems 4CC CsI crystal, it also came with some strange circuit...