Search found 10 matches

by James Luck
23 Feb 2020, 09:56
Forum: Detectors
Topic: Scintillation Crystal conversion
Replies: 4
Views: 612

Re: Scintillation Crystal conversion

On thought about this you could either go for a 1uCi Cs-137 source which is preferred by many, or if unable to pick one up, there are places that will rent lab sources. If size of sample you can use say a .25uCi source and do the conversion of strength to retrospective dose. if this is the path your...
by James Luck
12 Feb 2020, 14:32
Forum: Detectors
Topic: Scintillation Crystal conversion
Replies: 4
Views: 612

Re: Scintillation Crystal conversion

Jonathan, I think the only sensible way is to build it and then calibrate it to a known source. There are too many variables to try and calculate it. Steven I'm with Steve on this one, I'd just stick to a known source such as a 1uCi Cs-137 source. figure its count rate and then equate to dose.
by James Luck
12 Feb 2020, 06:35
Forum: Resources
Topic: USGS Geochemical and Mineralogical Maps
Replies: 1
Views: 603

Re: USGS Geochemical and Mineralogical Maps

Sweet ive been looking for a map of USA soil sampling for sometime. thanks for finding the link. I'm especially interested in the Chicago land area, as I'm a resident. do you know did Smith add the date of sampling as well? as in most industry based regions the soil geology was changed over time. -j...
by James Luck
12 Feb 2020, 06:26
Forum: Detectors
Topic: Scintillation Crystal conversion
Replies: 4
Views: 612

Re: Scintillation Crystal conversion

On the subject of counts to Sieverts, it would be best suited to maybe go from Counts/Sec to Rem/ min, or hour. As counts can rough estimate to R and R can be translated to Sieverts. yet couldn't you put into software the necessary script to equate counts from detector to Sieverts? such as using a r...
by James Luck
11 Feb 2020, 20:10
Forum: General discussion
Topic: Help wiring a crismatec 1.25" NaI (Ti) scintillator.
Replies: 8
Views: 585

Re: Help wiring a crismatec 1.25" NaI (Ti) scintillator.

Here's some links to similar listings for essentially the same probe i picked up, i think it was surplus from many companies or government departments, but without the running equipment. probably scrapped. https://www.ebay.com/itm/Bicron-Gamma-Scintillation-Spectrometer-Sample-Vial-Probe-SMT-Circuit...
by James Luck
11 Feb 2020, 19:46
Forum: General discussion
Topic: Help wiring a crismatec 1.25" NaI (Ti) scintillator.
Replies: 8
Views: 585

Re: Help wiring a crismatec 1.25" NaI (Ti) scintillator.

Hi James, Looking at your picture it looks like the thick white wire is HV (pos or neg?) The coax center is signal the coax shield is ground, and the red wire is probably low power for the amplifier I would expect +5 or +12 Volt. You could give it a try! Luuk Hey thanks Luuk, yes the coaxial cable ...
by James Luck
09 Feb 2020, 10:37
Forum: General discussion
Topic: Help wiring a crismatec 1.25" NaI (Ti) scintillator.
Replies: 8
Views: 585

Re: Help wiring a crismatec 1.25" NaI (Ti) scintillator.

https://drive.google.com/drive/folders/ ... sp=sharing

Here's a link to the photos of the Crismatec. it appears the body is pressed together, im going to continue fiddling.
by James Luck
08 Feb 2020, 21:21
Forum: General discussion
Topic: Help wiring a crismatec 1.25" NaI (Ti) scintillator.
Replies: 8
Views: 585

Re: Help wiring a crismatec 1.25" NaI (Ti) scintillator.

Hi James, I saw it on eBay ,it is probably a custom made model so it will be very difficult to get data/info about it. Best is to open the back and try to see if you can get directly to the pmt connector/wires. Then it should be possible to connect it. Some picture from the electronics might help t...
by James Luck
08 Feb 2020, 16:44
Forum: General discussion
Topic: Help wiring a crismatec 1.25" NaI (Ti) scintillator.
Replies: 8
Views: 585

Help wiring a crismatec 1.25" NaI (Ti) scintillator.

I've recently became the owner of a Crismatec 1.25" well type scintillator. This is possibly a Bicron or Saint Gobain scintillator also. the scintillator has a wire toggle and circuit board attached with what appears to be a 12 volt wire, a shielded Gnd and respective signal out, and a high voltage....
by James Luck
08 Feb 2020, 16:07
Forum: Introductions >> Start Here !
Topic: Hello from Illinois, usa.
Replies: 1
Views: 280

Hello from Illinois, usa.

Been tinkering in detection gear for a few years now, just moving into spectroscopy and scintillation detectors.