Search found 42 matches

by MartinM
14 Jun 2019, 22:41
Forum: Spectrum
Topic: Fukushima Soil
Replies: 22
Views: 2379

Re: Fukushima Soil

Guys, there's just one problematic assumption you make. You take the date of 3/11/2011 as the date when those isotopes were created. But this is not true - the material existed in the reactor for quite some time (could even be a few years). It was just expelled from the reactor in March 2011 (actual...
by MartinM
05 Dec 2018, 02:10
Forum: Spectrum
Topic: Test with a special and rare high resolution crystal!
Replies: 4
Views: 1349

Re: Test with a special and rare high resolution crystal!

Wow, very nice results. Thanks for sharing Luuk!
by MartinM
15 Aug 2018, 23:59
Forum: Detector drivers
Topic: New GS product preview
Replies: 10
Views: 3676

Re: New GS product preview

Interesting! What are the parameters of the integrated sound card?
by MartinM
30 Jul 2018, 06:59
Forum: Spectrum
Topic: Polonium spark plugs spectrum (no polonium left there of course)
Replies: 2
Views: 1395

Re: Polonium spark plugs spectrum (no polonium left there of course)

How about induced radioactivity caused by alpha particles?
by MartinM
20 Feb 2018, 09:09
Forum: Resources
Topic: Isotope & Europe
Replies: 3
Views: 3707

Re: Isotope & Europe

Thanks for the guide. I too have studied this in the past and I think that most countries in the EU have the same rules. Activity limits for exempt consignment should be listed in Table 2.2.7.2.2.1 of ADR (European Agreement Concerning the International Carriage of Dangerous Goods). But beware of so...
by MartinM
26 Oct 2017, 01:25
Forum: General discussion
Topic: Neutron Source (Fusor vs. Alpha-Beryllium) and Neutron shielding
Replies: 6
Views: 3723

Re: Neutron Source (Fusor vs. Alpha-Beryllium) and Neutron shielding

Really no need to mess with toxic Cadmium when you can use Boron. There is a lot of documents around describing neutron cross sections for absorption in various materials. Gadolinium is the best I think, but also expensive. I think Carl Willis was doing some experiments with neutron production and v...
by MartinM
19 Sep 2017, 00:25
Forum: Detector drivers
Topic: Noisy mono jack cables..
Replies: 4
Views: 2490

Re: Noisy mono jack cables..

Thanks for your offer Steven, but I believe the shipping costs would be higher that the cable :) I have already ordered one, though not sure how good it will be and whether it's shielded: http://www.ebay.co.uk/itm/SHORT-50cm-Mini-3-5mm-MONO-Jack-Plug-to-Plug-Audio-Cable-Male-Lead-0-5m/330442101502?s...
by MartinM
18 Sep 2017, 03:59
Forum: Detector drivers
Topic: Noisy mono jack cables..
Replies: 4
Views: 2490

Re: Noisy mono jack cables..

That cable looks same as mine, shipped with GSB-2020 in May-2016. Is it possible that I got it (don't have a scope to verify) ?
by MartinM
24 Jul 2017, 22:36
Forum: Spectrum
Topic: Spectrum of Fukushima soil
Replies: 12
Views: 4447

Re: Spectrum of Fukushima soil

"strong plutonium leakage" is a relative term ;) I doubt the leakage had such a significant Pu release, otherwise this would be a huge problem. You'd see also a significant amount of U-237 (and Am-241) peaks as the decay products of Pu-241 there. https://fas.org/sgp/othergov/doe/lanl/lib-www/la-pubs...
by MartinM
19 May 2017, 21:52
Forum: General discussion
Topic: Question about check sources
Replies: 18
Views: 5424

Re: Question about check sources

Also make sure to check you local laws what limits are allowed for shipping/possession of radioactive materials without license or the need to notify respective local authorities. Sources shipped from SpecTech have different activities and some like Cs-137 0.25 uCi are designed to be within exempt l...