Search found 48 matches

by Go-Figure
21 Jul 2019, 23:17
Forum: Spectrum
Topic: Trinitite Sample 2 - From the First Nuclear Bomb Explosion
Replies: 0
Views: 48

Trinitite Sample 2 - From the First Nuclear Bomb Explosion

Hi folks, This is my second attempt with a Trinitite sample. I got a second sample from United Nuclear, knowing that I am doing gamma spectroscopy the people from UN selected a nice glassy sample for me. You typically have two kinds of Trinitite sample: sand-like and glass-like. The glassy ones supp...
by Go-Figure
10 Jul 2019, 06:10
Forum: Spectrum
Topic: Lava Stone Pendant - Thorium 232
Replies: 3
Views: 123

Re: Lava Stone Pendant - Thorium 232

Hi Massimo, that's great fun. I'm feeling much better by laughing. and so you stay young and do not age. Why limiting yourself to stop aging when you can reverse it? :D I remember having a good laugh at a "quantum pendant" ad once. The first thing was that "Chi-Ki-Bio" energy (which in my language ...
by Go-Figure
08 Jul 2019, 01:38
Forum: Spectrum
Topic: Lava Stone Pendant - Thorium 232
Replies: 3
Views: 123

Lava Stone Pendant - Thorium 232

Hello Folks, And now for something completely different… Some time ago a person in my friendlist shared this object on FB. Another case of pseudoscience nonsense. I decided not to comment but I went and checked it out online. The amount of nonsense is breathtaking. This pendant, which in other versi...
by Go-Figure
05 Jul 2019, 05:26
Forum: Spectrum
Topic: Granite
Replies: 5
Views: 149

Re: Granite

Nice.
Pretty much matches what I got out of Tuff, they all have U238 and Th232 progeny + K40 unsurprisingly.
I have granite on my list too, but the next one will be something pretty different!

Massimo
by Go-Figure
02 Jul 2019, 08:43
Forum: Spectrum
Topic: Smoke Alarm - Americium 241
Replies: 6
Views: 229

Re: Smoke Alarm - Americium 241

I find with my tiny CsI/Na detector that I can see the lowest energies very well for Am241. Visible when the right voltage setting ~1310V for the smaller tube, shows the lower energy 13.92KeV, 17.8KeV and 26.5KeV gamma peaks quite well.. I am however unable to see those energies below 20KeV well wi...
by Go-Figure
30 Jun 2019, 21:01
Forum: Spectrum
Topic: Smoke Alarm - Americium 241
Replies: 6
Views: 229

Re: Smoke Alarm - Americium 241

pilgrim wrote: ↑
30 Jun 2019, 19:03
I don't know but I think it is due to the detector efficiency at low energies...
Of course. I wonder if it's all due to the size of the detector.
by Go-Figure
30 Jun 2019, 18:27
Forum: Spectrum
Topic: Trinitite - Radioactive Glass from the First Nuclear Bomb Explosion
Replies: 6
Views: 379

Re: Trinitite - Radioactive Glass from the First Nuclear Bomb Explosion

Hi Massimo, for such low level samples you need a very good lead shield, at least 5cm all around the detector IMHO ,for inside chamber dimensions bigger is better for reducing backscatter. I've made a modular lead shield made by rings that could take inside a standard 5-600cc Marinelli for 3"x3" de...
by Go-Figure
30 Jun 2019, 18:20
Forum: Spectrum
Topic: Smoke Alarm - Americium 241
Replies: 6
Views: 229

Re: Smoke Alarm - Americium 241

Hi Massimo, good work as always. If it helps, this is my spectra recorded with the same source using a Victoreen LEG with a 1,5 x 0,5" NaI(Tl) crystal. c-Am241-Victoreen-10000s.jpg The peaks are 13.9, 17.7, 23.5 (sum peak of 20.8 e 26.4) and 59.6 keV Interesting that you have a few low energy peaks...
by Go-Figure
30 Jun 2019, 09:00
Forum: Spectrum
Topic: Smoke Alarm - Americium 241
Replies: 6
Views: 229

Smoke Alarm - Americium 241

Hi guys, Today I tested a smoke alarm containing 0.9 microcurie of Am241 so unsurprisingly Am241 is what I found. The smoke alarm was bought on Ebay and the package clearly says what's inside. The radioactive material is inside the little ionisation chamber so among the interactions registered by th...
by Go-Figure
25 Jun 2019, 21:07
Forum: Spectrum
Topic: Exposure and Dose Assessment, an Homemade Attempt
Replies: 5
Views: 277

Re: Exposure and Dose Assessment, an Homemade Attempt

Massimo, If you look at the diagram I posted above, it seems reasonable that you can correct for the absorption error simply by adding a constant to the distance between source and crystal (radius). Say in the above example you simply add 10 mm, this suggests that the crystal is 10 mm further away ...