Search found 93 matches

by stamasd
14 Aug 2019, 08:26
Forum: Spectrum
Topic: Radiation release near Severodvinsk
Replies: 11
Views: 369

Re: Radiation release near Severodvinsk

That's where the isotope analysis would help. :)
by stamasd
14 Aug 2019, 05:41
Forum: Spectrum
Topic: Radiation release near Severodvinsk
Replies: 11
Views: 369

Re: Radiation release near Severodvinsk

Essentially a small reactor used to generate heat and cause a gaseous or liquid propellant to expand and generate thrust.
by stamasd
13 Aug 2019, 21:46
Forum: Spectrum
Topic: Radiation release near Severodvinsk
Replies: 11
Views: 369

Re: Radiation release near Severodvinsk

If it's technetium that would point towards a uranium-based device, i.e. a reactor, rather than a plutonium device i.e. a warhead.
by stamasd
13 Aug 2019, 11:42
Forum: Spectrum
Topic: Radiation release near Severodvinsk
Replies: 11
Views: 369

Radiation release near Severodvinsk

I was wondering if there are fellow gamma spectroscopists in a geographical position to take any environmental readings of radiation supposedly released in the recent Russian military accident near Severodvinsk. Might be educational to see what isotopes are involved.
by stamasd
03 Aug 2019, 01:13
Forum: Detectors
Topic: WIP stilbene
Replies: 1
Views: 81

Re: WIP stilbene

Detector with pigtail
by stamasd
03 Aug 2019, 00:59
Forum: Detectors
Topic: WIP stilbene
Replies: 1
Views: 81

WIP stilbene

Inspired by the previous thread by Steven I have acquired a stilbene crystal and just got around to building a detector with it. Stilbene emission is mostly in violet/UV range with peak at 390nm. I have consequently built the detector with a UV-enhanced PMT. The crystal I have is20mm diameter by 30m...
by stamasd
30 Jul 2019, 23:20
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 311

Re: Will the real K-40 please stand up (please stand up, please stand up)

And indeed almost completely linear at 670V. I used Am-241 for the low end because the 88keV from Lu-176 was not clearly distinguishable. Even the Am-241 peak was unusual-looking, with a hump to the right side which I haven't seen before. The 26keV from Am-241 was not visible at all. In the graph I ...
by stamasd
30 Jul 2019, 08:09
Forum: Spectrum
Topic: Yet another Cs-137 spectrum from the Chachersk soil sample
Replies: 3
Views: 153

Re: Yet another Cs-137 spectrum from the Chachersk soil sample

The next time I go home - and by that I don't mean the place where I live now but the place where I was born, 5000 miles away from here - I should take some sort of gamma spectroscopy setup with me, or at least a survey setup to try and get samples. Even though it's probably going to be difficult to...
by stamasd
30 Jul 2019, 06:52
Forum: Spectrum
Topic: Will the real K-40 please stand up (please stand up, please stand up)
Replies: 12
Views: 311

Re: Will the real K-40 please stand up (please stand up, please stand up)

And even better at 700V (my default voltage for this setup). I had to increase the volume to 30% to keep the K-40 put. TBH the nonlinearity at the lower end is not unexpected. The Lu-176 peak at 88keV is much less defined than at higher voltages so there's an amount of uncertainty as to its exact lo...