Search found 771 matches

by Steven Sesselmann
13 Sep 2020, 09:13
Forum: Introductions >> Start Here !
Topic: Hi from northern Germany
Replies: 10
Views: 116

Re: Hi from northern Germany

Hello Dana,

Welcome to the forum.

It looks like you have valuable experience to contribute, so I look forward to reading your posts.

Well done on making it through our anti spambot registration system :)

Steven
by Steven Sesselmann
02 Sep 2020, 08:15
Forum: Detectors
Topic: First Test of SiPm Detector
Replies: 5
Views: 192

Re: First Test of SiPm Detector

Jonathan,

Very nice project, thanks for sharing, also on my list of things to do.

You have three cables coming from the evaluation board, does this mean that there is a coupling on the board?

Steven
by Steven Sesselmann
01 Sep 2020, 20:48
Forum: The lounge
Topic: Interesting Video about XRF
Replies: 2
Views: 134

Re: Interesting Video about XRF

Lukas,

I just had a look on ebay and yes, some of those prices are insane. It's really not that hard to make one of these.

Steven
by Steven Sesselmann
01 Sep 2020, 16:02
Forum: The lounge
Topic: Interesting Video about XRF
Replies: 2
Views: 134

Interesting Video about XRF

Hi Guys,

Came across this video worth watching.

https://youtu.be/KdfHVcU8U7U

Steven
by Steven Sesselmann
11 Aug 2020, 10:26
Forum: Detectors
Topic: PMT supply: positive vs. negative
Replies: 3
Views: 305

Re: PMT supply: positive vs. negative

Michael, Detectors with PMT's wired for negative HV are relatively uncommon. Hamamatsu seems to be the one who promotes this scheme, but for all the thousands of GS unit's I have made, only 2-3 customers ever asked me for negative bias. When I was making the original GS-1100A it was easy to flip the...
by Steven Sesselmann
26 Jul 2020, 19:46
Forum: Detectors
Topic: SI19N Neutron Detector
Replies: 4
Views: 712

Re: SI19N Neutron Detector

Lukas,

Yes, I am aware of your web site, it's a really good source of information for all those confusing Russian tubes.

Nice work..

Steven
by Steven Sesselmann
26 Jul 2020, 17:23
Forum: Detectors
Topic: SI19N Neutron Detector
Replies: 4
Views: 712

SI19N Neutron Detector

Hi All, This weekend I have been busy making a neutron detector kit for a local client, it turned out good and I should probably add it to my range of products. The detector is based on a Russion He3 corona tube called SI19N and according to the specs. it has an nvth (efficiency to thermal neutrons)...
by Steven Sesselmann
21 Jul 2020, 21:34
Forum: Detector drivers
Topic: Oscilloscope test point
Replies: 1
Views: 434

Re: Oscilloscope test point

Hi Andrey, The BNC connector is a signal output when the switch under the GS is pushed towards the connector and converts to an input when the switch is pushed the other way. What you get from the BNC is the decoupled signal straight off the coupling, but because it is not disconnected from the rest...
by Steven Sesselmann
20 Jul 2020, 14:42
Forum: Detectors
Topic: Pulse height shift with pulse rate?
Replies: 9
Views: 1286

Re: Pulse height shift with pulse rate?

Mike,

The detector I used yesterday has an ADIT 1.5" B38 series PMT with integral divider. from memory it is a 10 stage divider with 1.5 Mohm resistors, pretty sure there are three caps between D7-D8-D9-D10

Steven
by Steven Sesselmann
19 Jul 2020, 22:28
Forum: Detectors
Topic: Pulse height shift with pulse rate?
Replies: 9
Views: 1286

Re: Pulse height shift with pulse rate?

Mike et.al., I just did a quick test with the GS-USB-PRO and one of my standards GS-1515 NAI detectors using a Cs137 source placed at 15, 10, 5, and 1 cm. with count rates varying from 221 cps, to 1710 cps. and see no significant drift. The slight drift we see is more likely due to temperature chang...