Search found 93 matches

by Geoff
05 Apr 2019, 04:04
Forum: Software
Topic: PRA 22 Hold on to your seats..
Replies: 7
Views: 722

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: 259

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: 913

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: 858

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: 3057

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: 3057

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: 1418

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...
by Geoff
24 Apr 2018, 07:46
Forum: Spectrum
Topic: Depression uranium glass
Replies: 7
Views: 2356

Re: Depression uranium glass

Thanks! I have glass from late 19th century through late 20th century. I'll have to figure out a way to test though, my castle is more studio apartment with an 80 cm^3 sample holder. I might have to build a temporary shield with lead bricks.
by Geoff
24 Apr 2018, 02:34
Forum: Spectrum
Topic: Depression uranium glass
Replies: 7
Views: 2356

Re: Depression uranium glass

I have a small collection of uranium glass, but I've not tried to collect a spectrum from any of it. Seems I know what my next project will be.
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by Geoff
08 Apr 2018, 14:31
Forum: Shielding
Topic: Ask Wolfram Alpha about half value layer
Replies: 7
Views: 4078

Re: Ask Wolfram Alpha about half value layer

My tungsten is inside of the lead. For the detector shield its lead-tungsten-copper for the source shield its lead-tin-copper