Search found 209 matches

by luuk
05 Jul 2019, 20:45
Forum: Shielding
Topic: Pigs might fly !
Replies: 5
Views: 577

Re: Pigs might fly !

Hi Steven,
Great idea and a nice design, interesting!
Luuk
p.s. I took this picture a long time ago, so I am sure pigs do can fly!
by luuk
09 Jun 2019, 00:25
Forum: Detectors
Topic: Quick way to kill a PMT
Replies: 3
Views: 470

Re: Quick way to kill a PMT

Hi Steven, Yes a safety maybe a good idea I have thought of it to, but while testing a lots of detectors every day it is to much to work for me so I just have to pay attention what I am doing and up till now I never killed a pmt so the chance that is goes completely wrong is really small, I think yo...
by luuk
08 Jun 2019, 04:18
Forum: Detectors
Topic: Quick way to kill a PMT
Replies: 3
Views: 470

Re: Quick way to kill a PMT

Hi Steven, I am surprised to see that the cathode on our pmt is completely gone how long did the pmt stayed in full light with the hv turned on? It happened a few times that I while testing a crystal I opened the door of the testbox(blackbox) and removed the crystal so the cathode was uncovered with...
by luuk
26 May 2019, 18:17
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 845

Re: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

Hi Massimo,
Nice spectra, that is a great solution you found for it, well done!
Luuk
by luuk
21 May 2019, 03:18
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 2111

Re: Fukushima Soil

Hi Massimo, I did today a test to see if it is still possible to see the 605Kev peak separated from the 662Kev in the Fukushima soil with a simple NaI(Tl) detector. I took a 2x2” NaI(Tl) with an excellent resolution of 6.0%@662KeV. The first test I did without shielding you can see on the left edge ...
by luuk
19 May 2019, 00:39
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 2111

Re: Fukushima Soil

Hi Massimo, please look at the following link: http://www.gammaspectacular.com/phpBB3/viewtopic.php?f=5&t=27&sid=2e7ed2902ce153c1173e5d133d80e496 I did in 2015 some tests with different resolution crystals with a Fukushima sample to show what you can see and also expect with a certain resolution cry...
by luuk
18 May 2019, 00:25
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 2111

Re: Fukushima Soil

Almost forgot but here is a link to the location were the soil was harvest.

https://www.google.com/maps/place/37%C2 ... 140.750785

Luuk
by luuk
18 May 2019, 00:05
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 2111

Re: Fukushima Soil

Hi Massimo,
I just see a dumb mistake that I made, but you already noticed it the low Cs-134 peak is not 569KeV but 605KeV just visible on the left edge from the 662KeV.
Don't know why I came up with 569KeV I must be getting old I guess, or just a little to much Belgian trappiest beer :-)
Luuk
by luuk
16 May 2019, 03:24
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 2111

Re: Fukushima Soil

Hi Massimo,
Thanks for posting the spectrum it looks good even without any shielding, you can still see on the left slope of the Cs-137(662KeV), a part of the Cs134 569KeV.
What is the resolution of your detector at 662KeV?
Luuk
by luuk
11 May 2019, 01:48
Forum: Spectrum
Topic: Zn-65 Spectrum Mystery
Replies: 9
Views: 834

Re: Zn-65 Spectrum Mystery

Hi Christopher, I have tested a lot’s of crystals but never seen this afterglow phenomenon you describe here. Yes, it is true that crystals e.g. CsI(Tl) and CsI(Na) are known of having sometimes afterglow but that only happened when radiated with a strong Uv, Fl or daylight not by a simple test sour...