Search found 74 matches

by cicastol
30 May 2020, 00:48
Forum: Detector drivers
Topic: Gamma spectacular + Red Pitaya = Nuclear Dragon fruit?
Replies: 5
Views: 223

Re: Gamma spectacular + Red Pitaya = Nuclear Dragon fruit?

Nice Conor, well done!

I think using "real" high speed ADC boards like Red Pitaya is the way to go to get results like pro system.
by cicastol
27 Apr 2020, 05:31
Forum: Spectrum
Topic: Beach sand, Vromos bay (Bulgaria)
Replies: 16
Views: 3014

Re: Beach sand, Vromos bay (Bulgaria)

R0B0T wrote:
13 Jan 2020, 16:20
This is Vromos Beach



Is 0.20 MSv dangerous? How dangerous can it be??

Hi, it's 0,20 uSv NOT 0.2MSv !!

0,2uSv is safe level :-)
by cicastol
31 Mar 2020, 22:29
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

- The controversial Ba133 peak around 80 keV is weaker this time, which will possibly make it even more controversial. As it was forming it looked again as two distinct peaks with something around 80 keV and something else around 85 keV, just like last time. Hi Massimo, IMHO this reinforce me the i...
by cicastol
29 Mar 2020, 06:50
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

Yes pg 6 , it is listed as median taken from 11 trinitite samples , one thing for sure, your's sample look really interesting !!
Now i'll take again the spectrum from my sample but i remember only a hint of Eu peaks and not much more ,not quite interesting as yours....
by cicastol
29 Mar 2020, 04:58
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

If you look at pg. 9 table 2 of your's linked paper, the estimated 133Ba activity concentrations recalculated to the date of explosion was 9.1 Bq/g (LMS 2010) now in 2020 it should be less than 0.1 Bq/g , i think it is well under MDA of your's setup , 137Cs to Ba133 ratio now should be near 100/1 an...
by cicastol
29 Mar 2020, 00:19
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

Ba133. I didn’t see this coming. When a 80 keV peak started to form I didn’t know what to make of it. I first considered the most uninteresting and conventional options: an X-Rays peak from naturally occurring Pb212 or Pb214? It’s possible, but I tested several Trinitite samples already and that pe...
by cicastol
28 Mar 2020, 00:03
Forum: General discussion
Topic: Trinitite @ 1945
Replies: 1
Views: 553

Re: Trinitite @ 1945

It is not so simple, you need to consider branch ratio , for example 661keV gamma decay happens only 85% , remaining is B- , so you need also to consider the beta efficiency of the detector at given energy and then take account of the geometry error because it is not a point source and neither a uni...
by cicastol
25 Feb 2020, 01:44
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

Ideally the BG integration time should be the same of data collection, it is like a dark frame subtraction in astrophotography , yes 17 days data plus 17 days BG is a little boring !

:-)
by cicastol
19 Feb 2020, 09:18
Forum: Spectrum
Topic: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum
Replies: 22
Views: 2224

Re: Trinitite – The Quest for Europium and More: A 17 Day Gamma Spectrum

Hi Massimo, WOW 17 days integration time ?!!? crazy !! Great ,really, in the nearest future i will try to take longer integration time with my Trinitite sample, also mine has very low activity... Try to get a better shield ,even with the slight improvement in lowered background, IMHO is not yet up t...
by cicastol
26 Nov 2019, 00:17
Forum: General discussion
Topic: Mini Xray xrf
Replies: 13
Views: 2232

Re: Mini Xray xrf

Steven Sesselmann wrote:
25 Nov 2019, 16:41
Taray,

If your tube outputs 15 keV x-rays and we assume a high Z target then your power supply is probably only giving you 15kV under load.
Hi Steven, the bremsstrahlung peak is roughly 1/3 of input voltage, so tube input should be in excess of 30kV.