Search found 613 matches

by Steven Sesselmann
16 May 2019, 07:47
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

Very nice...

In this case would it be possible to use the ratio of Cs137/Cs134 to accurately date the soil sample?

Do we know the initial state ?

Steven
by Steven Sesselmann
13 May 2019, 12:03
Forum: Software
Topic: Interspec - a free gamma peak analysis software
Replies: 4
Views: 436

Re: Interspec - a free gamma peak analysis software

More on InterSpec, Did a run on Th232 with a small 1.5" detector and the detector had quite a bit of non linearity, so I exported it as txt and dropped it into InterSpec. I also had to quit the software and re-open it for the calibration to work, but after doing so, it worked and all the peaks fell ...
by Steven Sesselmann
11 May 2019, 19:25
Forum: Software
Topic: GEIGERBOT for Iphone
Replies: 30
Views: 1082

Re: GEIGERBOT for Iphone

Michael,

The Geigerbot web page suggests a solution ghere: https://sites.google.com/site/geigerbot/docs

But on my iphone the Geigerbot app does not show in settings, maybe the same on yours?

This is a recent problem with iOS, I don't know what the solution is.

Steven
by Steven Sesselmann
11 May 2019, 10:31
Forum: Spectrum
Topic: Zn-65 Spectrum Mystery
Replies: 9
Views: 557

Re: Zn-65 Spectrum Mystery

Christopher, I suggest this needs further investigation to find the root cause. Some pretty crazy physics would be going on for the crystal to continue seeing a 1.1 MeV gamma after removing the source. Even if it were an annihilation peak from positrons you would expect this to be spontaneous. I fou...
by Steven Sesselmann
10 May 2019, 07:50
Forum: Software
Topic: Interspec - a free gamma peak analysis software
Replies: 4
Views: 436

Re: Interspec - a free gamma peak analysis software

Gary, Thanks for sharing, great find! I had a little play with this software and found it to be quite user friendly and sophisticated, coming from Sandia National Laboratories I would expect no less. This is a great tool for beginners puzzled about the peaks they are seeing, because it has built in ...
by Steven Sesselmann
10 May 2019, 07:42
Forum: Software
Topic: GEIGERBOT for Iphone
Replies: 30
Views: 1082

Re: GEIGERBOT for Iphone

Michael, Geigerbot can be tricky, and the iPhone connection needs a special cable to work. Now with the latest iPhones that don't have the TRRS connector it's even more tricky as you need an adaptor for the adaptor :) Here is a post on the cable you need to use. http://www.gammaspectacular.com/phpBB...
by Steven Sesselmann
09 May 2019, 10:00
Forum: Introductions
Topic: Further greetings from South Australia
Replies: 1
Views: 190

Re: Further greetings from South Australia

Hi Gary,

Welcome to the forum, great to see some locals here on the forum (albeit 1300 km from Sydney). South Australia has it all, natural Uranium under the ground and fallout from British bomb testing on top, what a great place to be ;)

Steven
by Steven Sesselmann
09 May 2019, 07:47
Forum: General discussion
Topic: Radiodating using NaI(Tl)
Replies: 11
Views: 867

Re: Radiodating using NaI(Tl)

George,

If you read the post above you will see that this attempt to date sediment is based on trace amounts of Cs137 fallout from nuclear bomb testing in the 50's, so detecting this with a sensitive setup is definitely plausible.

Steven
by Steven Sesselmann
06 May 2019, 19:25
Forum: Spectrum
Topic: Zn-65 Spectrum Mystery
Replies: 9
Views: 557

Re: Zn-65 Spectrum Mystery

Christopher, Good observation, CsI(Tl) is an excellent scintillation material and has good resolution, but it is known to exhibit afterglow or luminescence. I am not 100% clear about how or why this effect is more prominent in CsI, but many papers have been written on this subject. It sounds like th...
by Steven Sesselmann
02 May 2019, 17:56
Forum: Spectrum
Topic: Greetings from Victoria, BC Canada + Cs137 spectrum with odd peak
Replies: 14
Views: 860

Re: Greetings from Victoria, BC Canada + Cs137 spectrum with odd peak

Conor,

Yes that is strange, I am not familiar with the Theremino adapter circuit, so I can't comment.

Steven