Search found 48 matches

by Go-Figure
22 May 2019, 08:53
Forum: Spectrum
Topic: Lantern Mantle (Thorium)
Replies: 3
Views: 307

Lantern Mantle (Thorium)

Hi there, I guess everyone here already did this spectrum and probably many of you even posted it. Still, here's mine. Lantern mantles. I received them inside little transparent plastic bags and I have no plan to ever getting out of them, so no direct skin contact, just in order to avoid risk of acc...
by Go-Figure
21 May 2019, 17:43
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

Hi Guys, Whenever I hear the word impossible, I feel challenged, because nothing is impossible :D I have a suggestion, how about taking a background recording in PRA with a pure Cs137 check source, then run a recording of the Fukushima soil with background subtraction. Possibly the peaks Cs134 will...
by Go-Figure
21 May 2019, 07:31
Forum: Spectrum
Topic: Radium Clock
Replies: 4
Views: 303

Re: Radium Clock

Massimo, Pleased to see you have identified the little Pb210 peak, it was discussed in another post recently. Stevenhttps://www.gammaspectacular.com/phpBB3/viewtopic.php?f=5&t=506 That was the first time it showed as a genuine peak in my spectra. I already detected it, but much less clearly, in my ...
by Go-Figure
21 May 2019, 07:26
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

So the simple conclusion is: that it will not be possible without the use of a special high resolution crystal to really separate these two peaks, so just a small bump on the edge is all you can detect. Luuk Yeah, after a 18 hours measurement + roughly as much for background I know by now that that...
by Go-Figure
19 May 2019, 19:22
Forum: Spectrum
Topic: Radium Clock
Replies: 4
Views: 303

Re: Radium Clock

isoenzyme wrote:
19 May 2019, 03:42
Beautiful spectra! Thanks for providing the spectra in both counts and energy per bin.
Yes. the Radium Clock didn't disappoint.
I hope I can post some more data about it shortly.
by Go-Figure
19 May 2019, 19:09
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

Ciao Massimo, yes,unfortunatly now is a little bit too late to see the lower 134Cs peak with a NaI(Tl) scintillator, your's current estimated resolution of 6,1% is a little optimistic, i noted that is common a compression of the spectra that tend to show higher than real resolution, you need to do ...
by Go-Figure
19 May 2019, 01:15
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

Hi Massimo, please look at the following link: http://www.gammaspectacular.com/phpBB3/viewtopic.php?f=5&t=27&sid=2e7ed2902ce153c1173e5d133d80e496 I did in 2015 some tests with different resolution crystals with a Fukushima sample to show what you can see and also expect with a certain resolution cr...
by Go-Figure
19 May 2019, 00:46
Forum: Spectrum
Topic: Radium Clock
Replies: 4
Views: 303

Radium Clock

Hi folks, The other day i put my hands on a "radium clock" and I couldn't wait to test it, which I just did. Despite most of the alphas are blocked by the front glass the Geiger counter reads an excess of 1000 CPM (normal background = 50 CPM with the same counter) so it's pretty active. It still exi...
by Go-Figure
19 May 2019, 00:08
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

Almost forgot but here is a link to the location were the soil was harvest. https://www.google.com/maps/place/37%C2%B033'32.0%22N+140%C2%B045'02.8%22E/@37.558901,140.750785,842m/data=!3m1!1e3!4m5!3m4!1s0x0:0x0!8m2!3d37.558901!4d140.750785 Luuk Thank you! I was hoping that you could tell us where ex...
by Go-Figure
17 May 2019, 00:26
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 1313

Re: Fukushima Soil

Massimo, In PRA you can read the total net counts in the ROI. To select the R.O.I. you select a bin to the left of your peak and press the "b" key (beginning) then select a bin to the right of your peak and press "e" for end. The ROI should show in yellow. Now along the top of your window you shoul...