Search found 208 matches

by Go-Figure
16 May 2019, 08:28
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 8210

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 I think we can ask Luuk about the initial state, he probably was in a position to test samples like this not long after the incident. Thinking abo...
by Go-Figure
15 May 2019, 23:20
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 8210

Fukushima Soil

Here it is my spectrum of a 1.5 gram sample of Fukushima soil from a few weeks after the incident. This is an unshielded test with background subtraction. The Cs 134 gamma peak is clearly visible although reduced to roughly 6% its of original activity after eight years. Both expected Cs 137 peaks ar...
by Go-Figure
13 May 2019, 06:12
Forum: Spectrum
Topic: Cathode Ray Tube TV Front Glass Spectrum
Replies: 0
Views: 1609

Cathode Ray Tube TV Front Glass Spectrum

Hello there, This is one of the first spectra I took with my kit. I had noticed before that the front glass of the cathode ray tube TV was the "hottest" object I had at home according to my geiger counter: 400-500 CPM in some spots, 7-8 times the background. So I knew there was something lurking the...
by Go-Figure
13 May 2019, 05:40
Forum: Spectrum
Topic: Autunite (Uranium Ore) Spectrum
Replies: 2
Views: 1344

Re: Autunite (Uranium Ore) Spectrum

Good work, Massimo! A took a spectra of a Pitchblende sample few days ago, in my lead shield but It wasn't good as yours. I have to try the PRA's background subtraction, it seems to work very well! Thank you Daniel, Yeah, actually works just fine! The downside is that before every measure you have ...
by Go-Figure
11 May 2019, 19:50
Forum: Spectrum
Topic: Autunite (Uranium Ore) Spectrum
Replies: 2
Views: 1344

Autunite (Uranium Ore) Spectrum

Hello there, A couple of days ago I received my first uranium ore, a sample of Autunite. Actually, five samples. So far I detected Uranium in many spectra, but always mixed up with other things. This object was supposed to give me my first “clean” Uranium spectrum. I put the samples inside hermetic ...
by Go-Figure
09 May 2019, 06:29
Forum: Spectrum
Topic: Introduction and Rain Spectrum
Replies: 3
Views: 1536

Re: Introduction and Rain Spectrum

Hi Massimo. You mentioned having no lead shield, if there were a lead shield I would guess X-Rays from the stable lead in it causing the ~77 peak. This is common as the stable lead is being excited by random cosmic rays, emitting it's characteristic X-Ray into the probe. We solve that by a copper l...
by Go-Figure
05 May 2019, 02:20
Forum: Spectrum
Topic: Calibrating with background
Replies: 2
Views: 2078

Re: Calibrating with background

I used background for calibration while doing a measurement in a basement bathroom (bathroom tiles never disappoint) where temperature was a bit colder than the room where the initial calibration was done so I noticed some thermal drift. Since the calibration was already relatively right it was easy...
by Go-Figure
04 May 2019, 22:57
Forum: Spectrum
Topic: Introduction and Rain Spectrum
Replies: 3
Views: 1536

Introduction and Rain Spectrum

Hello folks, My name is Massimo and I am from Italy. I am a mechanical engineer and I am quite new to gamme spectroscopy, I got my GS-2020 2"x 2" NaI Scintillation detector + GS-USB-PRO Driver only a couple of weeks ago so I am deep in the beginners zone. I still have no shield, so all my measure so...