Search found 49 matches

by RobertD
18 Nov 2023, 03:21
Forum: Introductions >> Start Here !
Topic: Greetings from the foothills of Colorado!
Replies: 10
Views: 2357

Re: Greetings from the foothills of Colorado!

You are welcome. Rock hunting is so much fun and can be very rewarding. I am mainly using scintillator based detectors for that purpose because they are much more sensitive and react quicker than Geiger counters. Here are some recent finds: IMG_20230917_191616.jpg A word of caution: uranium glimmer ...
by RobertD
18 Nov 2023, 02:29
Forum: Detectors
Topic: Neher-White Cold War era dose rate meter
Replies: 3
Views: 1074

Re: Neher-White Cold War era dose rate meter

The unit actually has two calibration potentiometers, I'll post a picture tomorrow. Edit: here it is IMG_20231118_112547.jpg I do not have a sufficiently active check source at home and I did not want to remove the lead around the chamber so it's correct function is not verified. I may take it to a ...
by RobertD
18 Nov 2023, 02:17
Forum: Introductions >> Start Here !
Topic: Greetings from the foothills of Colorado!
Replies: 10
Views: 2357

Re: Greetings from the foothills of Colorado!

Hi Chase, On the subject of finding natural uranium ore in the wild, I would suggest to check mindat.org for abandoned mines. Normally, you can still find pieces in those areas. Take a UV flashlight with you in addition to your Geiger counter, Autunite for example has very nice fluorescence. Another...
by RobertD
26 Oct 2023, 17:50
Forum: Detectors
Topic: Neher-White Cold War era dose rate meter
Replies: 3
Views: 1074

Neher-White Cold War era dose rate meter

Dear all, I wanted to share some information about a rather exotic (at least I think so) detector. When I recently reorganized stuff and equipment in my basement, I came across this handy little unit. IMG_20231026_080225.jpg It is an IM-179/U gamma dose rate meter, manufactured by Heat Pipe Corp. of...
by RobertD
27 Jul 2023, 18:08
Forum: Detector drivers
Topic: Detector for rock hunting
Replies: 2
Views: 1119

Re: Detector for rock hunting

Here is a short video with the detector in action:
VID_20230611_185616.mp4
(5.53 MiB) Downloaded 122 times
by RobertD
27 Jul 2023, 18:04
Forum: Detector drivers
Topic: Detector for rock hunting
Replies: 2
Views: 1119

Detector for rock hunting

Here is a little tool I built recently, based on Matthias' Mini SiPM Driver Board, using a 1" dia x 1" CsI(Tl) coupled to a single MICROFC-60035 SiPM: https://www.gammaspectacular.com/phpBB3/viewtopic.php?f=15&t=1089 When looking for radioactive rocks in the wild, I always found it ann...
by RobertD
24 Jun 2023, 17:46
Forum: Detectors
Topic: Dosimeter with CsI crystal and SiPM
Replies: 4
Views: 1146

Re: Dosimeter with CsI crystal and SiPM

Impressively low power consumption!
by RobertD
23 Jun 2023, 01:38
Forum: Detector drivers
Topic: Portable spectrometer / survey meter
Replies: 12
Views: 3408

Re: Portable spectrometer / survey meter

The setup was like this, no shielding involved:
IMG_20230622_173444.jpg
by RobertD
23 Jun 2023, 01:33
Forum: Detector drivers
Topic: Portable spectrometer / survey meter
Replies: 12
Views: 3408

Re: Portable spectrometer / survey meter

Hi Sebastian,
on a 20 minute spectrum of a Cs-137 check source, I´m getting 7.3%:
20minCs137.JPG
by RobertD
08 Jun 2023, 04:26
Forum: Detector drivers
Topic: Portable spectrometer / survey meter
Replies: 12
Views: 3408

Re: Portable spectrometer / survey meter

I just finished a downsized version, utilizing a 1" dia x 1" NaI(Tl) scintillator and a 2x2 SiPM matrix.