Search found 96 matches

by Geoff
21 Aug 2019, 15:16
Forum: Resources
Topic: Radioactive Minerals
Replies: 6
Views: 193

Re: Radioactive Minerals

0.085 mR/hr on my calibrated Ludlum model 18 including background.
37ABA289-6F7C-4494-A798-5AA3F8862450.jpeg
by Geoff
17 Aug 2019, 03:43
Forum: Resources
Topic: Radioactive Minerals
Replies: 6
Views: 193

Re: Radioactive Minerals

Radioactive minerals on mindat you say? My photo gallery can be found at https://www.mindat.org/gallery-21211.html As for radian barite, minerals tend to be pretty old. I have a huge sample from the Czech Republic but it’s not very strong. Most of the radium has already decayed to lead making it mor...
by Geoff
04 Aug 2019, 00:47
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 335

Re: Will the real K-40 please stand up (please stand up, please stand up)

That bump should be there. It’s likely 125 keV. You can see there are more peaks to a 241Am spectrum hidden by the 59 keV in my discussion on energy attenuation:

viewtopic.php?f=5&t=384&p=1822#p1822
by Geoff
05 Apr 2019, 04:04
Forum: Software
Topic: PRA 22 Hold on to your seats..
Replies: 7
Views: 971

Re: PRA 22 Hold on to your seats..

Interesting, I'm excited to try the sum quantity setting.
by Geoff
02 Apr 2019, 11:25
Forum: Spectrum
Topic: New lutetium source
Replies: 1
Views: 340

New lutetium source

David Hamric has a web shop called metallium where he sells custom minted element coins. I recently added a 26th to my collection, lutetium. The coins are about the size of an American cent and are absolutely beautiful.
by Geoff
06 Feb 2019, 09:28
Forum: General discussion
Topic: Compton Scatter Experiment
Replies: 5
Views: 1142

Re: Compton Scatter Experiment

Holy crap that's cool!
by Geoff
27 Nov 2018, 13:31
Forum: Resources
Topic: New links to INL's gamma ray catalogue
Replies: 1
Views: 984

New links to INL's gamma ray catalogue

Hi all, long time since I've been on. I'm still settling in in Wisconsin, not much time for the hobby yet. I finally got a chance to set up my spectrometer and mess around with PRA 20. I really like the background subtraction! Anyway, while calibrating I found that the old links to Idaho National La...
by Geoff
11 Jul 2018, 01:02
Forum: The lounge
Topic: Goodbye Alaska
Replies: 4
Views: 3230

Re: Goodbye Alaska

It's a spectacular drive, but not the longest I've done. When I moved up in 2005 I drove from North Carolina to Alaska. About another 18 hours in the car from there. I've got some awesome non-radiation related pictures from the trip. I'll make a public photo album on Facebook later and share it here.
by Geoff
10 Jul 2018, 06:42
Forum: The lounge
Topic: Goodbye Alaska
Replies: 4
Views: 3230

Goodbye Alaska

The dismal job market in Alaska has finally chased me away. I drove back to Wisconsin last week and am getting set up in my Mom's basement while I search for a new place to live. I'm looking at buying a quarry on the Stettin pluton and getting back into prospecting rare earth minerals again. In the ...
by Geoff
15 Jun 2018, 08:24
Forum: Spectrum
Topic: 90Sr/Y beta continuum from 4 year old source
Replies: 0
Views: 1505

90Sr/Y beta continuum from 4 year old source

I had an opportunity to buy a four year old .1 uCi 90Sr source (90% of the original isotope still exists) for half the cost of a new one. I didn't NEED it, but seeing as I didn't have a pure beta emitter I figured I'd buy it. Here is a ten hour spectrum I collected after it arrived. I'm experimentin...