Search found 288 matches

by Jim Kovalchick
Thu Oct 31, 2019 2:14 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2096

Re: Cube fusor build

Jon,
Wow! I was hoping you would have these results. Maybe my next fusor is one like this. Activation is really on of the best amateur uses of fusion. Thanks for the careful reporting.

Jim K
by Jim Kovalchick
Tue Oct 29, 2019 9:27 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2096

Re: Cube fusor build

Jon, You are making good efforts trying to understand the neutron emission spatial characterization. I'm far from expert, but I sense that emissions in your latest device are too complex to understand with conventional detectors. CR-39 plastic placed at various orientations might shed some light. I ...
by Jim Kovalchick
Fri Oct 04, 2019 10:48 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2096

Re: Cube fusor build

Thanks for the response Jon. I think your numbers being all over the place as you say illustrate my concern about inverse square simplicity. I think the relative size of the source, its non-point source nature, and the detector geometries confound it. I suspect MCNP would probably help but only afte...
by Jim Kovalchick
Fri Oct 04, 2019 10:21 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 28
Views: 2096

Re: Cube fusor build

I have held skepticism for some of the neutron numbers people have reported using bubble detectors for the small cross fusors because the geometry doesn't make sense to me. So, when Jon reports these numbers using his instruments my skepticism of other people's numbers is further supported. I think ...
by Jim Kovalchick
Fri Sep 27, 2019 4:38 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Goodbye fusor IV 2004-2019...Hello Fusor V
Replies: 7
Views: 811

Re: Goodbye fusor IV 2004-2019...Hello Fusor V

Richard, I consider that particular fusor of yours somewhat historic because of the inspiration it provided many of us who visited. I wish I could be there to see it operate one more time, but alas, work obligations will keep me away. On behalf of myself and my family, congratulations on Fusor IV's ...
by Jim Kovalchick
Sun Sep 22, 2019 2:46 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Local geographic gamma counting- how is your soil?
Replies: 16
Views: 1147

Re: Local geographic gamma counting- how is your soil?

Hunter,
The pond was used by the facility for routine releases. Very low activity but the facility operated for a few decades. The pond may have accumulated.
.
Point of trivia is that same pond provided water to the area for a couple hundred years.
by Jim Kovalchick
Sat Sep 21, 2019 11:10 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Local geographic gamma counting- how is your soil?
Replies: 16
Views: 1147

Re: Local geographic gamma counting- how is your soil?

Hunter,
When checking the UVA research reactor site try sampling the soil in the pond. If you find anything it will be there.

Jim K
by Jim Kovalchick
Wed Sep 18, 2019 11:36 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Local geographic gamma counting- how is your soil?
Replies: 16
Views: 1147

Re: Local geographic gamma counting- how is your soil?

Richard, Interesting that you find Th in your soil. There are some known Th deposits around southeast PA where I used to do most of my amateur measuring, but the radon source in the area of our former home in York was U. Way back when Mike was in the seventh grade he did a project that proved it by ...
by Jim Kovalchick
Tue Sep 17, 2019 12:28 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Local geographic gamma counting- how is your soil?
Replies: 16
Views: 1147

Re: Local geographic gamma counting- how is your soil?

Here is a picture of my travel rig. As Richard said before scintillators are high count rate. I usually leave my device on c/s, but the detector block is pretty amazing. In scaler mode I have been able to sense repeatably an old style smoke detector at 20 ft.
by Jim Kovalchick
Tue Sep 17, 2019 12:06 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Local geographic gamma counting- how is your soil?
Replies: 16
Views: 1147

Re: Local geographic gamma counting- how is your soil?

Richard, I definitely could be convinced that my spot on 95 is the road itself. The only way to be sure is to venture off the road and see. The spot you spoke about on 83 would have been in York County PA which was my former home for 34 years. I found the whole area full of hot spots. Recall that th...