Search found 47 matches

by Go-Figure
04 Jun 2019, 06:50
Forum: Spectrum
Topic: Tuff (Volcanic Rock)
Replies: 4
Views: 277

Re: Tuff (Volcanic Rock)

As usual, excellent work Massimo! This, https://ibb.co/cYgpLm, is an old attempt I made with a single block. Thank you Daniel, I see you have two distinct peaks in the X-rays region, is the higher one from the lead shield? Ironically today I was at a building site and I came across a few old tuff b...
by Go-Figure
03 Jun 2019, 07:48
Forum: Spectrum
Topic: Tuff (Volcanic Rock)
Replies: 4
Views: 277

Tuff (Volcanic Rock)

Hi folks, This weekend I recorded two interesting spectra (interesting for me at least, hopefully for you too). This is the first one: tuff blocks. Tuff is a volcanic rock and here in Italy is a common building material, albeit it is less used now than say 20 or 30 years ago. As far as I know tuff i...
by Go-Figure
29 May 2019, 06:28
Forum: Spectrum
Topic: Radioactive Lens - Pentax Super-Takumar 50mm f1,4
Replies: 0
Views: 145

Radioactive Lens - Pentax Super-Takumar 50mm f1,4

Hi guys, I knew plenty of camera lenses produced in the past were radioactive and I was very curious to test one of them. I tried to find one from this list https://camerapedia.fandom.com/wiki/Radioactive_lenses and last week I finally found a Pentax Super-Takumar 50mm f1,4 lens. As soon as it arriv...
by Go-Figure
29 May 2019, 05:49
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 515

Re: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

I couldn't help to make a test too, in the same way Massimo did :-) . This is the first spectrum with my faint Cs137 source (a Spark Gap TG36), 37000s 01-Cs137, SparkGap TG36, 36000s Background.JPG And this is the Fukushima Soil's spectrum + background subtraction. 82000s (45000s net.) 03-Fukushima...
by Go-Figure
28 May 2019, 07:25
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 515

Re: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

Keep in mind that normal background varies from place to place. Steven Yeah, it also varies from time in the same place. I am taking many backgrounds in my house before every measurement and there are differences from day to day. I will now use this spreadsheet every time I take a new measurement t...
by Go-Figure
27 May 2019, 05:28
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 515

Re: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

Hi again folks, I am starting to do some analysis on my spectra using excel spreadsheets and data from PRA software. Below there's a recap chart of the Fukushima sample test comparing data from: - The Background. - The Background + The Sample. - The Sample alone. For each of them there is the total ...
by Go-Figure
27 May 2019, 01:56
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 515

Re: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

Thanks guys. After all this hide and seek seeing that peak finally emerging was tasty! Normally when you do the background you just leave it there on its own for hours, here I was constantly checking the ratios, putting the check source in and out. Basicaly I stayed there the whole time. I used the ...
by Go-Figure
26 May 2019, 07:23
Forum: Spectrum
Topic: Fukushima Soil Sample "Reloaded" with both Cs134 Peaks
Replies: 9
Views: 515

Fukushima Soil Sample "Reloaded" with both Cs134 Peaks

Hi Folks, Following our conversation (here https://www.gammaspectacular.com/phpBB3/viewtopic.php?f=5&t=510&sid=137a5df788a6b8398d0443a5fcda4c45) on Cs134 gamma peak at 604 keV detection in Fukushima soil sample I attempted a further experiment. Steven suggested to use a Cs137 check source as a backg...
by Go-Figure
26 May 2019, 07:17
Forum: Spectrum
Topic: Lantern Mantle (Thorium)
Replies: 3
Views: 293

Re: Lantern Mantle (Thorium)

Thank you both.

Massimo
by Go-Figure
22 May 2019, 08:53
Forum: Spectrum
Topic: Lantern Mantle (Thorium)
Replies: 3
Views: 293

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...