Fake Trinitite Spectrum

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Geoff
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Fake Trinitite Spectrum

Post by Geoff » 21 May 2015, 14:52

Well, I got burned on this one. I bought a "certified authentic" piece of Trinitite a few months ago and just tested it yesterday. Attached is the 24 hour spectrum with background subtracted.
fake trinitite.JPG
Last edited by Geoff on 27 Oct 2017, 17:50, edited 1 time in total.
Geoff Van Horn

Anchorage and Deadhorse Alaska

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Steve Dubyk
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Re: Fake Trinitite Spectrum

Post by Steve Dubyk » 21 May 2015, 23:00

Ouch, it looks like typical U ore. Trinitite has dominant peaks from Cs-137 and Am-241, with lots of little peaks from Eu-152, -154, and other nuclides. I can post a couple of papers in the library that show the spectrum from trinitite.

Steve Dubyk

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brehwens
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Re: Fake Trinitite Spectrum

Post by brehwens » 22 May 2015, 05:59

Hi Geoff,

That sucks... I bought my trinitite sample via a contact from the Yahoo forum, so it was kind of failsafe. I could also verify that it was indeed trinitite.
Still, the 3x3" probe I used picks up lots from the background as well and the trinitie sample was weak, so a smaller probe and more lead could possibly be more informative. I hope to be able to test this in the time to come.
Attachments
814--361441581321396640478--Trinitite 63h-1200x800.jpg
trinitite, 3x3" NaI
814--361441581321396640478--Trinitite 63h-1200x800.jpg (116.61 KiB) Viewed 4225 times
Karl Brehwens
Eskilstuna, Sweden.

Setup: 5 cm lead castle, 2mm copper lining. Gamma Spectacular Pro 2002, Sound Blaster Live! 5.1,
Primary detector: Scionix refurbished 2x2" NaI(Tl) well detector, 7.5% @ 662 keV

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Steve Dubyk
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Re: Fake Trinitite Spectrum

Post by Steve Dubyk » 22 May 2015, 08:56

I've attached a file with a few more examples of the trinitite spectrum, using different probes. I do like using trinitite for testing, especially to see the 26 and 59 keV from cesium and americium.

Steve
Attachments
Trinitite Spectra Examples.pdf
(247.6 KiB) Downloaded 224 times

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Geoff
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Re: Fake Trinitite Spectrum

Post by Geoff » 22 May 2015, 15:51

I used my 4.5x.75 inch NaI detector and ran it for 24 hours. Then I ran the background for 24 hours and subtracted that to get my spectrum.

Here is all the data
blah.JPG
Last edited by Geoff on 27 Oct 2017, 17:48, edited 1 time in total.
Geoff Van Horn

Anchorage and Deadhorse Alaska

cicastol
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Re: Fake Trinitite Spectrum

Post by cicastol » 24 Oct 2017, 04:03

Hi, i've taken a 16h spectra of a Trinitite sample, 3"x3" Luuk detector with my new modular lead shield.
Main peaks are from 241Am ,137Cs and Eu154/152
Attachments
trinity16h.jpg
Ciro

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Steven Sesselmann
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Re: Fake Trinitite Spectrum

Post by Steven Sesselmann » 24 Oct 2017, 07:57

Geoff (and others),

I'm not sure what you are seeing, but the images hosted by photobucket are just showing an add to upgrade my account. This forum typically hosts its own images, so please resize your images to a reasonable size < 900x900 and upload them in a standard format.

3rd. party hosting can be unreliable and could result in meaningless posts hanging without images.

Thanks..

Steven
Steven Sesselmann | Sydney | Australia | gammaspectacular.com | groundpotential.org | rephopper.com | beejewel.com.au |

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Geoff
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Location: Marathon County, Wisconsin
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Re: Fake Trinitite Spectrum

Post by Geoff » 27 Oct 2017, 17:52

Sorry Steven. I saw the news about this a while ago. I'll go through all my posts and fix broken images.
Geoff Van Horn

Anchorage and Deadhorse Alaska

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