Search found 246 matches

by luuk
04 Jul 2020, 19:51
Forum: Detectors
Topic: Is this Detector Too Big, Too Old, or Just Normal?
Replies: 13
Views: 61

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: 18

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: 13
Views: 61

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...
by luuk
03 Jul 2020, 19:08
Forum: Detectors
Topic: Is this Detector Too Big, Too Old, or Just Normal?
Replies: 13
Views: 61

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

Hi Mike, Don't worry about the crack that does not have to be a problem, I have repaired detectors with big and many cracks that still work great. The color is difficult to see on the picture but it looks not so bad to be honest. The interface between the crystal and glass looks good to me for an ol...
by luuk
03 Jul 2020, 15:02
Forum: Detectors
Topic: Is this Detector Too Big, Too Old, or Just Normal?
Replies: 13
Views: 61

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

Hi Mike, Nice big detector you got there! This detector has a stainless steel housing so it will be difficult to detect low energies they will be strongly attenuated.. It looks like the crystal is “brown” but that could be just the picture that is difficult to see. Clean the surface with some alcoho...
by luuk
27 Jun 2020, 06:41
Forum: Detectors
Topic: Questions about Voltage Divider PMT bases
Replies: 6
Views: 92

Re: Questions about Voltage Divider PMT bases

Hi Mike, The main purpose for any gain adjustment on a detector is normally used to match one detector with other detectors, so if you do not couple different detectors together and you have just one here is not a real use for it. Set the gain to it maximum is always good because in that case you ma...
by luuk
26 Jun 2020, 19:57
Forum: Detectors
Topic: Questions about Voltage Divider PMT bases
Replies: 6
Views: 92

Re: Questions about Voltage Divider PMT bases

Hi Mike, 1: A low resistance vd will give less or non-peak shift at (very) high counter rates, so not very important for hobby use because hobby sources are (hopefully) not strong, if they are better you find a weak source! High resistance vd will use less power from your Hv unit , therefore better ...
by luuk
26 Jun 2020, 03:52
Forum: Detectors
Topic: Accuracy of Scionix 38B57? Markings on Cap
Replies: 2
Views: 42

Re: Accuracy of Scionix 38B57? Markings on Cap

Hello Andrey, SED521 is the serial number , 6.4% is the resolution for Cs-137(662KeV) that is very good considering that the lowest possible is 6.0% for NaI(Tl), 150mV is the output measured by the customer is has not a significant value for hobby purpose. If the detector is not modified but still h...
by luuk
17 Jun 2020, 01:53
Forum: General discussion
Topic: Mu-Metal.
Replies: 6
Views: 231

Re: Mu-Metal.

James,
if you need mu-metal I always have some used shield for a hobby price, if you are interested send me a pm with your needs.
Than I can look if I have something for you.
Luuk
by luuk
13 Jun 2020, 05:01
Forum: General discussion
Topic: Mu-Metal.
Replies: 6
Views: 231

Re: Mu-Metal.

Hi James, Like Steven wrote most solid mu-shields are around 0.8mm, and the real thick ones are 1mm, I don’t think I have seen much thicker than around 1mm. For standard use I would suggest 0.5-0.8mm that should be sufficient for a detector that is not used at a fixed place but you can “walk” around...