Search found 928 matches

by Sesselmann
31 May 2022, 17:37
Forum: Spectrum
Topic: 150KeV peak not U235?
Replies: 7
Views: 118

Re: 150KeV peak not U235?

Here is a quick comparison spectrum with PRA of an old clock face.

Steven
Radium Clock
Radium Clock
by Sesselmann
31 May 2022, 07:53
Forum: Spectrum
Topic: 150KeV peak not U235?
Replies: 7
Views: 118

Re: 150KeV peak not U235?

Mike, Both of your theories are plausible, sum x-ray peak will land around 150 kV and some Compton back scatter from the higher energy peaks may also land around there. In PRA you could try running the spectrum with a very tight pulse shape tolerance ~ 0.5 to 0.8 this should eliminate some of summin...
by Sesselmann
15 May 2022, 10:44
Forum: Introductions >> Start Here !
Topic: Bonjour de France
Replies: 1
Views: 42

Re: Bonjour de France

Hi Eric,

Welcome to the forum, glad you made it through the anti spam bot test 😂

Curiosity is a good thing, question everything and you will find answers to questions you never knew existed.

Steven
by Sesselmann
04 May 2022, 21:04
Forum: Detectors
Topic: Semiconductor Survey Meters
Replies: 4
Views: 142

Re: Semiconductor Survey Meters

Greg, I see no one has yet replied to your post. Unfortunately I can't be of much help as I haven't done much work with semiconductor detectors and SIPM's but it's on my list of things to do. Semiconductors operate with a very different voltage and amplifier scheme and as far as I know there aren't ...
by Sesselmann
26 Apr 2022, 17:51
Forum: Detectors
Topic: gamma spectrometer signal
Replies: 11
Views: 1269

Re: gamma spectrometer signal

Pawel,

Sorry for slow reply, I just got back from a weeks trip up to Queensland.

I just opened your audio file in Audacity and as you can see for yourself the tallest pulses are barely making it to 50 arb.u.
Audio
Audio
Audio.png (71.77 KiB) Viewed 36 times
Your objective is to utilise the entire range.

Steven
by Sesselmann
12 Apr 2022, 07:41
Forum: Physics, electronics and beyond
Topic: What is the actual half-life of Cs-137?
Replies: 6
Views: 100

Re: What is the actual half-life of Cs-137?

I would like to know why isotopes decay ?

Reason tells me, if nothing is changing in our world then nothing should decay, so what causes nuclear decay ?

Let's agree to avoid vague terms like entropy 😂
by Sesselmann
11 Apr 2022, 07:56
Forum: Detectors
Topic: gamma spectrometer signal
Replies: 11
Views: 1269

Re: gamma spectrometer signal

Pawel,

Considering it is sampling at 48 kHz, the pulses look about right.

Count rate seems low for a scintillation detector, but maybe you are shielding out background... don't know?

Steven
Audacity Screen Shot
Audacity Screen Shot
by Sesselmann
07 Apr 2022, 13:56
Forum: Detectors
Topic: Plateau and Efficiency of a 44-2
Replies: 6
Views: 116

Re: Plateau and Efficiency of a 44-2

Greg, Without seeing the complete S curve it is difficult to verify your claim, 1025V does seem high for most PMT's. The objective of finding a plateau is to identify where the count rate flattens off before rising exponentially, so starting at very low voltages 500V you would get little of no count...
by Sesselmann
06 Apr 2022, 07:50
Forum: Introductions >> Start Here !
Topic: Greetings from California!
Replies: 2
Views: 54

Re: Greetings from California!

Alexander,

Welcome to the forum. I hope you find likeminded people, interesting conversation and information about radiation detection here.

On the main index you will find forums for different subjects, so feel free to share and discuss any science related project.

Cheers..

Steven
by Sesselmann
01 Apr 2022, 17:12
Forum: Product Manual Repository
Topic: Eberline ESP-2 Manual
Replies: 0
Views: 33

Eberline ESP-2 Manual

Manual attached