Search found 318 matches

by Jim Kovalchick
Wed Dec 12, 2018 11:46 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Creation, usage, and destruction of a cathode
Replies: 2
Views: 129

Re: Creation, usage, and destruction of a cathode

Enzo, It looks like you are learning a lot during your fusor work. I like your set up, and it looks like you want to keep yourself safe. I would like to offer an important safety tip to keep you and others out of trouble. I noticed that you used an alligator clip to fasten your ground to your chambe...
by Jim Kovalchick
Tue Dec 11, 2018 10:30 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 14
Views: 445

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

My shielding was tungsten, not lead. I'm not sure that makes a difference, but what make a difference was my very long background count did not include a Cs spike, but both of my sample counts did. I did my count about six years ago. I doubt that the little bit I saw then would be seen now. I may ha...
by Jim Kovalchick
Mon Dec 10, 2018 9:58 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 14
Views: 445

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

Jon,
My background count was longer than a day and there was no by CS 137.
by Jim Kovalchick
Mon Dec 10, 2018 11:24 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 14
Views: 445

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

Jon
I did not use much shielding. The Falcon I used had a tungsten ring lined with copper. I'm sure my counts included some background.
by Jim Kovalchick
Sat Dec 08, 2018 6:38 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 14
Views: 445

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

Once it's established, as Carl did, that there were enough fission events in the fuel to produce measurable fission products, it's all a matter of product migration not the neutron fluence seen by the graphite itself. The amount of products left in a piece of graphite will be dependent on a couple t...
by Jim Kovalchick
Sat Dec 08, 2018 11:53 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Gamma-ray Spectrum, CP-1 Graphite Memento
Replies: 14
Views: 445

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

Thanks for posting this Jon. About six years ago I did a 24 hour count on my CP-1 sample using a Canberra Falcon I borrowed from work. I didn't see the Eu peaks but there was a tiny Cs 137 peak. Others didn't believe my results so I repeated the count with the same results. When Carl did his study o...
by Jim Kovalchick
Mon Oct 08, 2018 1:23 pm
Forum: Images du Jour
Topic: HEAS 2018 Event Photos - Comments
Replies: 11
Views: 1075

Re: HEAS 2018 Event Photos - Comments

Thanks for the update Richard. I was waiting anxiously all weekend for someone to post so I could at least experience it vicariously given I could not attend in person. I was at a nuclear plant in Mexico all last week, and as a result I spent the weekend with the whole Montezuma revenge experience. ...
by Jim Kovalchick
Wed Sep 19, 2018 1:40 am
Forum: Files
Topic: Paper on neutron counting using ZnS(Ag) phosphors
Replies: 8
Views: 2733

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

I've had this paper in my pdf collection for years. Lot's of valuable info. I built the device and even used the same model Dumont pmt. I managed to find a source of boron powder highly enriched in B10. You dont need much. I got my phosphor from United Nuclear. Use the Ag doped kind, not Cu. You nee...
by Jim Kovalchick
Wed Jul 25, 2018 11:15 pm
Forum: New User Chat Area
Topic: Trying for Tritium
Replies: 6
Views: 722

Re: Trying for Tritium

A person who is licensed to operate a reactor is only licensed to operate that reactor. A facility license is only applicable to the activities described in its license.

What you describe is very likely illegal for lots of reasons.
by Jim Kovalchick
Wed Jul 18, 2018 12:17 pm
Forum: Images du Jour
Topic: Killer deal on a GeLi gamma spec
Replies: 6
Views: 1028

Re: Killer deal on a GeLi gamma spec

I'm not sure why you believe that intrinsic germanium detectors are inherently GeLi. High purity germanium detectors which do not drift and can be warmed are intrinsic. Looking at the vintage of your detector, I would say you have a chance that it could work if cooled. As near as I can tell, your de...