Search found 253 matches

by luuk
03 Sep 2020, 03:22
Forum: Detectors
Topic: First Test of SiPm Detector
Replies: 5
Views: 191

Re: First Test of SiPm Detector

Hi Jonathan,
It turned out really nice and it looks like all is working great, I like the design of the pcb.
Resolution is maybe a little to good but so you should check linearity that could give problems.
Luuk
by luuk
30 Aug 2020, 17:16
Forum: Spectrum
Topic: Fukushima Soil Sample
Replies: 6
Views: 283

Re: Fukushima Soil Sample

Hi Lukas,
Great results with your new LaBr3 detector, it works just perfect!
But my hart opens when I see the HpGe spectra, brings me back to old days a long time ago
when I build and tested them for Harshaw.
Luuk
by luuk
22 Aug 2020, 04:37
Forum: Detectors
Topic: Building a LaBr3:Ce Gamma Spectrometer
Replies: 10
Views: 495

Re: Building a LaBr3:Ce Gamma Spectrometer

Hi Lukas, The crystal crowers are always looking to improve the crystals, and not just by using different growing methods but also searching for better base materials. One way is to select other materials or from other suppliers e.g. some mines will give just a different base materials that can give...
by luuk
21 Aug 2020, 14:52
Forum: Detectors
Topic: Building a LaBr3:Ce Gamma Spectrometer
Replies: 10
Views: 495

Re: Building a LaBr3:Ce Gamma Spectrometer

Hi Lukas, Thanks that is what I wanted to know 0.71cps/cc that is what was to be expected. I was curious to see if they already found a way to improve the background, I know that Saint Gobain is doing it's best to lower the background and improved the LaBr3 every time but only a little If I am right...
by luuk
20 Aug 2020, 05:17
Forum: Detectors
Topic: Building a LaBr3:Ce Gamma Spectrometer
Replies: 10
Views: 495

Re: Building a LaBr3:Ce Gamma Spectrometer

Hi Lukas,
Nice detector you build and a great report very nice.
I would be interested in the total background of your detector in cps/cc if you find time to measure that.
Have lots of fun with this new great toy.
Luuk
by luuk
17 Jul 2020, 23:19
Forum: Detectors
Topic: Big Scintillator, maybe with SiPMs?
Replies: 5
Views: 598

Re: Big Scintillator, maybe with SiPMs?

I expect that it is a NaI(Tl) crystal, but because you cannot see the crystal it self I would not buy it, unless the seller shows pictures from the interface side. Can be wet who know? there is a sharp dent on it entrance window looks not so nice. A crystal like that is made for mostly for counting ...
by luuk
14 Jul 2020, 04:52
Forum: Detectors
Topic: Questions about Voltage Divider PMT bases
Replies: 8
Views: 992

Re: Questions about Voltage Divider PMT bases

Hi Mike, The grid/focus can simply be seen as a dynode (name it dynode 0) so Cathode connected to ground then a resistor to the grid/focus=Dynode 0 and then a resistor between grid/focus=Dynode 0 to Dynode 1 then the rest of the vd as always. The resistor value can be all the same for every resistor...
by luuk
04 Jul 2020, 19:51
Forum: Detectors
Topic: Is this Detector Too Big, Too Old, or Just Normal?
Replies: 14
Views: 1590

Re: Is this Detector Too Big, Too Old, or Just Normal?

Hi Mike, You have to consider a few things; even though your crystals is not perfect it is still usable in spite of all faults. To refurbish a detector of that size and construction is out of hobby range price, because the housing is almost for sure lost during that process and that alone cost maybe...
by luuk
04 Jul 2020, 19:24
Forum: Introductions >> Start Here !
Topic: Greetings from Munich
Replies: 4
Views: 797

Re: Greetings from Munich

Hi Lucas,
Welcome, I think that you contacted Scionix a few weeks ago.
if you have any questions about Scionix or detectors you can always ask me,
good chance i know the answer.
Luuk
by luuk
04 Jul 2020, 04:46
Forum: Detectors
Topic: Is this Detector Too Big, Too Old, or Just Normal?
Replies: 14
Views: 1590

Re: Is this Detector Too Big, Too Old, or Just Normal?

Hi Mike, I must agree with Tom the spectrum looks not so bad at all. cannot see the resolution but I see a clear acceptable peak a useful detector for sure. Easy to see that the lower energies are attenuated the 30 KeV from Cs-137 is almost not there, but that is as I said before the thick stainless...