Search found 113 matches

by Geoff
17 Mar 2020, 11:54
Forum: The lounge
Topic: Friends across the globe
Replies: 8
Views: 144

Re: Friends across the globe

Thanks for this Steven. Currently sitting in my front row seat to the continuing collapse of America, but not hoarding toilet paper.
by Geoff
09 Mar 2020, 12:01
Forum: Spectrum
Topic: Davidite from South Australia
Replies: 5
Views: 165

Re: Davidite from South Australia

Very nice article and specimen.
by Geoff
25 Feb 2020, 11:52
Forum: Spectrum
Topic: Radon decay products
Replies: 4
Views: 310

Re: Radon decay products

That’s a very interesting experiment!
by Geoff
09 Feb 2020, 05:34
Forum: Spectrum
Topic: New torbernite specimen with spectrum
Replies: 3
Views: 333

Re: New torbernite specimen with spectrum

With my Ludlum model 18 and a gm probe adjusted for 0cpm background, My Feb 2015 1uCi 133Ba source reads 0.5mR/hr. The torbernite reads 300mR/hr. Weight is around 90 grams.
by Geoff
08 Feb 2020, 18:14
Forum: Introductions >> Start Here !
Topic: Hello from Illinois, usa.
Replies: 1
Views: 269

Re: Hello from Illinois, usa.

Welcome from Wisconsin! I hope you enjoy our community.
by Geoff
08 Feb 2020, 15:09
Forum: Spectrum
Topic: New torbernite specimen with spectrum
Replies: 3
Views: 333

New torbernite specimen with spectrum

I recently acquired a new specimen of torbernite from Calo, la Coruna, Spain. It’s about 60x35mm, and very hot. Attached are two pictures and the gamma spectrum showing radium and daughters. 5680AE56-68FB-4EDB-B929-4AD03783173E.jpeg 30DA106F-4610-4EC5-BA30-471E49B51F61.jpeg D0EBC973-9A06-4C07-9E74-0...
by Geoff
02 Feb 2020, 08:21
Forum: Resources
Topic: Simple Thorium Linearity Check with Excel
Replies: 7
Views: 670

Re: Simple Thorium Linearity Check with Excel

Linearity? What's that? I've always known that my go-to probe had a problem, I didn't realize how bad it was!
linearity.JPG
specs.JPG
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by Geoff
01 Feb 2020, 13:24
Forum: Resources
Topic: Simple Thorium Linearity Check with Excel
Replies: 7
Views: 670

Re: Simple Thorium Linearity Check with Excel

When changing detector voltage, do you redo the pulse shape in PRA?
by Geoff
18 Jan 2020, 06:16
Forum: Shielding
Topic: My lead house for spectrometer
Replies: 8
Views: 725

Re: My lead house for spectrometer

That's really nice! I like that the lead is completely enclosed.
by Geoff
14 Jan 2020, 07:48
Forum: Spectrum
Topic: Beach sand, Vromos bay (Bulgaria)
Replies: 13
Views: 1239

Re: Beach sand, Vromos bay (Bulgaria)

Milen, that’s a really interesting history. Thanks for sharing! I’d love to visit that beach.