Search found 45 matches

by gwgw
13 Jan 2020, 20:09
Forum: Spectrum
Topic: Beach sand, Vromos bay (Bulgaria)
Replies: 13
Views: 526

Re: Beach sand, Vromos bay (Bulgaria)

Hello Gents, Im interested in the Vromos Bay radiation ropic. I can provide you with sand samples as many as needed as I live near by. What does that mean??? The sand sample that I have - or at least about 100g of it - shows just about 11 CPS (125 CPS being the normal background in the room and 25 ...
by gwgw
09 Dec 2019, 01:07
Forum: Spectrum
Topic: A Day in Fukushima - Gamma Spectroscopy
Replies: 17
Views: 420

Re: A Day in Fukushima - Gamma Spectroscopy

Fear and misconceptions made far more victims than radiation around here This is indeed true. I just remembered when I was a kid, early 90s, there was a comedy show on the national TV and one day they decided to make "The NPP did just explode" joke. I even found an archive video, it has English sub...
by gwgw
08 Dec 2019, 07:45
Forum: Detector drivers
Topic: Pushing an Arduino to the limit.
Replies: 7
Views: 518

Re: Pushing an Arduino to the limit.

I'd recommend ESP32, it's very cheap (you can have it for less than $10), it happily runs arduino sketches plus it's much more powerful and it has wifi/bluetooth and a lightweight tcp/ip stack. And it's surprisingly....well, working without issues. Much cheaper than the Uno yet much more powerful.
by gwgw
03 Dec 2019, 07:05
Forum: Spectrum
Topic: A Day in Fukushima - Gamma Spectroscopy
Replies: 17
Views: 420

Re: A Day in Fukushima - Gamma Spectroscopy

A really interesting read!
by gwgw
17 Nov 2019, 22:47
Forum: Introductions >> Start Here !
Topic: Hello
Replies: 2
Views: 156

Re: Hello

Hello, komsu :)
by gwgw
07 Nov 2019, 07:02
Forum: Spectrum
Topic: Lanthanum in NiMH Batteries
Replies: 4
Views: 1568

Re: Lanthanum in NiMH Batteries

50g of "high purity (99.9%)" Lanthanum. Has some weak photopeaks from thorium byproducts though (notably Pb-212)
by gwgw
25 Oct 2019, 08:16
Forum: General discussion
Topic: Visual effect of long term radiation exposure on the acrylic glass of a watch
Replies: 7
Views: 384

Re: Visual effect of long term radiation exposure on the acrylic glass of a watch

I remember watching a video where they put acryllic plastic glass through an electron beam irradiation device. There was also a gopro camera inside, placed inside a lead shield that was pointed towards that glass. At the moment the carriage went under the beam, the camera got completely crazy, recor...
by gwgw
22 Oct 2019, 08:02
Forum: General discussion
Topic: Minimal set of suggested sources for calibration
Replies: 4
Views: 230

Re: Minimal set of suggested sources for calibration

You are very lucky to live in the US where disk sources are readily available, things are much more complicated in the EU :) If it is about energy calibration only, there are quite a lot of cheap options still. A thorium source provides lots of peaks to calibrate against, I personally use thoriated ...
by gwgw
17 Oct 2019, 07:13
Forum: Spectrum
Topic: Lutetium ?
Replies: 11
Views: 4343

Re: Lutetium ?

Did some experiments with 1g Lutetium and 30g KCl in an attempt to figure out an approximation of the energy/efficiency curve of the detector. 1g of Lutetium turns out quite enough to get a nice spectrum with becqmoni in less than 2 hours... The approximation is probably rather inaccurate though. Ne...
by gwgw
17 Oct 2019, 05:50
Forum: Spectrum
Topic: Hottest Sample so far - Autunite Crystal from China
Replies: 19
Views: 800

Re: Hottest Sample so far - Autunite Crystal from China

After 48h, it is now 25 Bq/m3. I guess radon levels are low after all...which is good :) If my monthly average turns up to be below 50, I will lift "the ban" :) Well, probably won't get that particular autunite, the listing has expired. It was beautiful indeed - https://www.olx.bg/ad/kristal-autunit...