Search found 120 matches

by Geoff
13 May 2020, 01:07
Forum: General discussion
Topic: alpha emitter
Replies: 6
Views: 1154

Re: alpha emitter

Are my comments not showing up?
by Geoff
05 May 2020, 07:19
Forum: General discussion
Topic: alpha emitter
Replies: 6
Views: 1154

Re: alpha emitter

Not sure why you didn’t get results, but I have a couple thoughts. First, I think samarium would be closer to 130bq/g. Second, only the outer layer of the surface facing the detector would be an alpha source? I’m not sure about alpha particle interactions with matter, but wouldn’t a thin sheet of th...
by Geoff
23 Apr 2020, 05:07
Forum: Detectors
Topic: Very Large Anti Compton system
Replies: 6
Views: 1007

Re: Very Large Anti Compton system

That is an incredible piece of technology and master craftsmanship! Truly beautiful.
by Geoff
20 Apr 2020, 14:46
Forum: Spectrum
Topic: Protactinium
Replies: 5
Views: 990

Re: Protactinium

For more information about filtering gamma rays you can check out this paper Gamma Ray Interactions with Matter by G. Nelson and D Reilly. I used a cadmium filter to detect the higher energy gamma rays in a 40 year old americium source. https://faculty.washington.edu/agarcia3/phys575/Week2/Gamma%20r...
by Geoff
17 Apr 2020, 00:20
Forum: Spectrum
Topic: Terracotta Floor Tile
Replies: 1
Views: 546

Re: Terracotta Floor Tile

Clay typically contains weathered feldspar minerals which contain potassium.
by Geoff
15 Apr 2020, 05:34
Forum: General discussion
Topic: UO2 ? spectrum
Replies: 5
Views: 1216

Re: UO2 ? spectrum

How old is the UO2 powder? My guess is it’s much younger than the other samples. When I extract uranium from ore as ammonium diurynate I use carbonate extraction which is very specific for uranium, leaving all daughters in the leachate. My fresh precipitate spectrum looks a lot like your UO2 spectrum.
by Geoff
07 Apr 2020, 04:07
Forum: Spectrum
Topic: uranium glass spectrum
Replies: 2
Views: 768

Re: uranium glass spectrum

That’s a beautiful bottle! Thank you for sharing it.
by Geoff
17 Mar 2020, 11:54
Forum: The lounge
Topic: Friends across the globe
Replies: 8
Views: 1287

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: 1145

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: 1320

Re: Radon decay products

That’s a very interesting experiment!