Search found 735 matches

by Steven Sesselmann
03 Apr 2020, 08:42
Forum: Spectrum
Topic: resolution ?
Replies: 2
Views: 21

Re: resolution ?

hello, just a small question: how is the resolution assessed and evaluated? Good, normal or bad? Cs137-K40.jpg Peter, Energy resolution is calculated by taking the energy spread at half maximum height (FWHM) and dividing it by the energy of the photo peak, this is then expressed in percentage. i.i....
by Steven Sesselmann
01 Apr 2020, 09:32
Forum: Detectors
Topic: Ex-Royal Air Force Contamination meter NIS322XA by D.A Pitman LTD
Replies: 3
Views: 32

Re: Ex-Royal Air Force Contamination meter NIS322XA by D.A Pitman LTD

Thanks for posting, very interesting and slightly complicated build.

What is the size of the crystal?

Is the spring arrangement intended for quick changing the crystal?
by Steven Sesselmann
28 Mar 2020, 10:19
Forum: General discussion
Topic: Time to acquire spectra
Replies: 5
Views: 86

Re: Time to acquire spectra

Phil,

Your spectra above look reasonable.

In regards to your second question, I have never heard of anyone seeing the trace amount of Tl in NaI(Tl), in any case I doubt you would be able to resolve 2614 and 2694 keV.

Steven
by Steven Sesselmann
27 Mar 2020, 09:42
Forum: Detector drivers
Topic: Simple Arduino Pulse Rate Counter
Replies: 19
Views: 1732

Re: Simple Arduino Pulse Rate Counter

Sure, see stl files attached..

Steven
by Steven Sesselmann
25 Mar 2020, 17:03
Forum: General discussion
Topic: Time to acquire spectra
Replies: 5
Views: 86

Re: Time to acquire spectra

Phil, Good question.. Some of our members have been able to count very weak sources, check out a post by Karl Brewhens. https://www.gammaspectacular.com/phpBB3/viewtopic.php?f=5&t=261&p=1214#p1207 Adding even a small amount of lead shielding around your detector can significantly improve your signal...
by Steven Sesselmann
19 Mar 2020, 13:37
Forum: The lounge
Topic: Friends across the globe
Replies: 8
Views: 144

Re: Friends across the globe

Milen, It would be a personal corona meter, just like an alcohol tester you just blow in it once a day with a disposable straw and it sends the result to a global database with GPS location. Maybe a tiny mass spectrometer tuned to detect particles with the same mass as the virus, I don't know if tha...
by Steven Sesselmann
18 Mar 2020, 09:16
Forum: The lounge
Topic: Friends across the globe
Replies: 8
Views: 144

Re: Friends across the globe

Jonathan,

I agree, testing is a logistical problem.

Maybe with our collective knowledge we can develop a cheap USB Corona meter :)

Stay safe !

Steven
by Steven Sesselmann
17 Mar 2020, 21:20
Forum: The lounge
Topic: Friends across the globe
Replies: 8
Views: 144

Re: Friends across the globe

Thanks for this Steven. Currently sitting in my front row seat to the continuing collapse of America, but not hoarding toilet paper. Geoff, I think you should have stayed in Alaska, things are not looking good in the US. Assuming that the death rate is an indication of the number of infections 17 d...
by Steven Sesselmann
16 Mar 2020, 21:18
Forum: The lounge
Topic: Friends across the globe
Replies: 8
Views: 144

Friends across the globe

Greetings Friends, As events unfold around the world I think of all my friends and fellow scientists in Europe and the USA and hope you all have a safe place to work. Once again the news is full of people in hazmat suits and respirators, this time with thermometers instead of radiation detectors. As...
by Steven Sesselmann
14 Mar 2020, 09:01
Forum: Introductions >> Start Here !
Topic: Greetings from France
Replies: 2
Views: 92

Re: Greetings from France

Hello Alain, Welcome to the forum and thanks for the intro. Putting together a spectrometer to measure Cs-137 and other isotopes is no problem, you will find all the information you need here. The detector is the most expensive component, but it is not so difficult to make your own (if you like that...