Search found 1349 matches

by Jon Rosenstiel
Tue Dec 11, 2018 7:18 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 15
Views: 1362

Re: Gamma-ray Spectrum, CP-1 Graphite Memento

Thanks Jim, that's good to know. I've cleaned the inside of the shield multiple times and even tried another detector but I always get the same 2 to 3 counts/hour Cs-137 background, I was beginning to think that was normal. So maybe, as Bruce suggests, the shield's construction materials are the sou...
by Jon Rosenstiel
Mon Dec 10, 2018 7:18 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 15
Views: 1362

Re: Gamma-ray Spectrum, CP-1 Graphite Memento

Jim, Ok, one more question, did you do a 24-hr background run also? I ask because my background runs always have a small Cs-137 peak. (Two to three counts/hour with the detector inside of the lead shield) I don't think there is an exact source for the Cs-137 background, it just seems to be pretty-mu...
by Jon Rosenstiel
Sun Dec 09, 2018 4:51 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 15
Views: 1362

Re: Gamma-ray Spectrum, CP-1 Graphite Memento

Jim,

Re: your 24-hour count, how much shielding did you use?

Jon Rosenstiel
by Jon Rosenstiel
Fri Dec 07, 2018 11:36 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 15
Views: 1362

Gamma-ray Spectrum, CP-1 Graphite Memento

Earlier this year I acquired (from a fellow nuke-head) a Lucite encased piece of graphite from Chicago Pile-1, the world’s first nuclear reactor. These 25th anniversary mementos were given out (I believe) mainly to those who labored behind the scenes. It hadn’t occurred to me until just recently tha...
by Jon Rosenstiel
Tue Sep 18, 2018 5:05 pm
Forum: Files
Topic: Paper on neutron counting using ZnS(Ag) phosphors
Replies: 8
Views: 4631

Re: Paper on neutron counting using ZnS(Ag) phosphors

Roberto, ZnS(Ag) neutron detectors are notoriously poor performers (as I recall,efficiency is around 1%) so for the budding fusioneer this avenue is pretty-much a non-starter. But for someone that already has a neutron producing fusor and is looking for something to do with those neutrons this may m...
by Jon Rosenstiel
Fri Sep 14, 2018 9:01 pm
Forum: Files
Topic: Paper on neutron counting using ZnS(Ag) phosphors
Replies: 8
Views: 4631

Paper on neutron counting using ZnS(Ag) phosphors

Phosphor mixtures for neutron scintillation counting.
ZnS(Ag) for neutron detection.pdf
(660.25 KiB) Downloaded 100 times

Jon Rosenstiel
by Jon Rosenstiel
Thu Apr 19, 2018 4:59 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: My Gamma Spectroscopy Setup
Replies: 6
Views: 2054

Re: My Gamma Spectroscopy Setup

Richard, Appreciate the kind words. My reasoning behind all of this is that if something goes haywire with my back (I ain't no spring chicken) I will still have some hobbies that I can play with despite not being able to easily get around. (Anyway, that's the plan) Rich, Yeah, it's pretty-much one o...
by Jon Rosenstiel
Fri Apr 13, 2018 11:22 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: My Gamma Spectroscopy Setup
Replies: 6
Views: 2054

My Gamma Spectroscopy Setup

It may have been 60 some years ago but I remember it like it was yesterday. I was sitting at my workbench in the basement of my parents’ home on our family farm listening to faint clicks in my headphones. The Geiger counter I had just finished building actually worked! The faint clicks were the resu...
by Jon Rosenstiel
Fri Mar 02, 2018 11:23 pm
Forum: New User Chat Area
Topic: IAEA SPEDAC PRO VER 5.0 WANTED
Replies: 1
Views: 757

Re: IAEA SPEDAC PRO VER 5.0 WANTED

Give FitzPeaks gamma spectrometry software a try. Free download at http://www.jimfitz.co.uk/fitzpeak.htm It will open and save gamma spec files in several different formats... may do what you want. Note that it requires 32 bit Windows.

Jon Rosenstiel
by Jon Rosenstiel
Mon Feb 12, 2018 8:58 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High Voltage Ballast Resistor and Inner Grid Help
Replies: 4
Views: 1608

Re: High Voltage Ballast Resistor and Inner Grid Help

As to fusor grid wire, I suspect Dennis meant tungsten, not titanium.

Jon Rosenstiel