Search found 17 matches

by Paul McK
16 Jun 2016, 21:07
Forum: Software
Topic: PRA 12.0.0 Out Now
Replies: 11
Views: 4920

Re: PRA 12.0.0 Out Now

Version 15 with the "res%" display is a real plus and this starts to give results very quickly. FYI, when auto selecting the ROI the keyboard shortcut "D" seems best (D = double or very wide ROI) as this selects the whole of the ROI and thus gives a result more consistent with the known detector res...
by Paul McK
21 Jan 2016, 20:36
Forum: Shielding
Topic: RUG Vault (RUG - Radioactive Under Ground)
Replies: 5
Views: 4484

Re: RUG Vault (RUG - Radioactive Under Ground)

Steven Yes I was concerned about the radon build up and couldn't find a simple method to vent to outside. As an alternative I have put samples in old plastic pill containers with tight fitting lids that I retrieve and open outside when I want a sample. Do you think this is OK? Initially I tested som...
by Paul McK
21 Jan 2016, 20:25
Forum: Detectors
Topic: Surprise result from CsI(Na) build
Replies: 2
Views: 1493

Re: Surprise result from CsI(Na) build

Steven Probably not as it came from the US. There are no markings on it and it did not have any original packaging it was simply sold as CsI(Na) when I felt the weight it sort of confirmed it was. I put it temporarily onto a PMT and within an hour of receiving it found it has such a good resolution....
by Paul McK
21 Jan 2016, 20:10
Forum: Detectors
Topic: Building a detector with a Scionix Scintillator
Replies: 5
Views: 2890

Re: Building a detector with a Scionix Scintillator

Thanks for the feedback. Yes the housings make the difference, some of those odd sized ones I made are only PVC pipe with a disc cut out of an end cap and glued into the bottom, then an end cap is pushed on the other end and the whole lot spray painted with a can of blue paint that turned out to be ...
by Paul McK
21 Jan 2016, 19:58
Forum: Detectors
Topic: Sheilding for PMT
Replies: 4
Views: 2304

Re: Shielding for PMT

Tim The photocathode is on the face of the PMT so from there onwards there is an electron beam so I guess you need the Mu metal shield to cover the full length of the tube as opposed to only the dynode assembly within the 2" straight section? Maybe someone can comment on the effectiveness of only sh...
by Paul McK
20 Jan 2016, 23:07
Forum: Detectors
Topic: Surprise result from CsI(Na) build
Replies: 2
Views: 1493

Surprise result from CsI(Na) build

Hello all. For general interest, this post is about a 2"x2" unbranded scintillator I found for a good price a while back and it returned surprisingly good resolution. I built a detector using a Philips XP5212 PMT (8.8% 57Co) in much the same construction as my previous post on Scionix... ie Perfecti...
by Paul McK
20 Jan 2016, 21:33
Forum: Shielding
Topic: RUG Vault (RUG - Radioactive Under Ground)
Replies: 5
Views: 4484

RUG Vault (RUG - Radioactive Under Ground)

I recently came up with a simple idea for a low cost underground store for small quantities of low level samples. It uses plumbing pipe and fittings to give a 150mm diameter waterproof underground storage vault. This seems to do the job, have a look at the attached pictures to make sense of the foll...
by Paul McK
20 Jan 2016, 00:31
Forum: Detectors
Topic: Building a detector with a Scionix Scintillator
Replies: 5
Views: 2890

Building a detector with a Scionix Scintillator

Hello everyone, I'd like to share this build from last August. Intro: Prior builds. I built my first detector last April (2"x2" NaI(Tl)) which had 9% resolution. I experimented with several PMT's, various divider resistances (18 to 60+M) & tried split signal. The detector functioned well but the res...
by Paul McK
05 Dec 2015, 23:22
Forum: Shielding
Topic: Modular Lead Shield for 2" detectors
Replies: 7
Views: 5661

Re: Modular Lead Shield for 2" detectors

Vit Thanks for that observation, I wish I had used a copper pipe instead of steel in the lead shield construction. Anyway I bought a copper sheet (0.016" thick) a few weeks back that I want to see if I can fit around the detector and line the sample chamber to see if even a thin copper sheet can imp...
by Paul McK
01 Dec 2015, 23:26
Forum: Detectors
Topic: Q-Safe QSF104 Radiation Detector
Replies: 3
Views: 2928

Re: Q-Safe QSF104 Radiation Detector

Steven Yes it's very compact. In reply to your questions, from the user manual the energy range claimed is 50keV to 6MeV?? There is no reference to efficiency across the range. The accuracy is given as below 20% or 0.15uSv/h. The scintillator is CsI(Tl) with 2000CPM/uSv/h for 137Cs. You mentioned th...