Search found 116 matches

by Joe Gayo
Sat Aug 01, 2020 6:02 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8383

Re: Cube fusor build

All that I've trying to show, in a general sense, is that the measurements that Jon took are best described by an anisotropy volume source, not an isotropic volume source.
by Joe Gayo
Sat Aug 01, 2020 3:54 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8383

Re: Cube fusor build

Frank,

If you look at the image below you'll notice I altered the axis00 equation to have preferential emission 1.6x that of axis90. I would say within the error of measurement and only evaluating 2 angles this closely approximates Jon's data.

Joe
Iso v Ani - 2.PNG
by Joe Gayo
Sat Aug 01, 2020 8:45 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8383

Re: Cube fusor build

Jon, Mathematically 20 inches is far enough. Thanks for confirming the measurements I took when I started 2 years ago (although my cathode was different, I still had the single beamline). Frank, The red is Jon's measurements and the dashed line is a line source of isotropic emitters with infinite po...
by Joe Gayo
Fri Jul 31, 2020 5:57 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Cube fusor build
Replies: 57
Views: 8383

Re: Cube fusor build

Frank, I don't think the laser cavity analogy really holds. Isotropic sources would resemble a candle or filament and obey the 1/r^2 law. The only definitive proof would be if Jon performed the experiment with the detector at a much greater distance so the line source would be approximated as a poin...
by Joe Gayo
Thu Jul 30, 2020 10:37 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Activation measurement technique
Replies: 47
Views: 13590

Re: Activation measurement technique

Any of these images would be also super useful: ATTACHMENTS meshtally.jpg meshtally.jpg (57.25 KiB) Viewed 2413 times geom1.jpg geom1.jpg (43.87 KiB) Viewed 2413 times [The extension txt has been deactivated and can no longer be displayed.] doug_3.jpg doug_3.jpg (127.44 KiB) Viewed 2413 times doug_2...
by Joe Gayo
Thu Jul 30, 2020 10:27 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Moderator Simulation Study
Replies: 9
Views: 4947

Re: Moderator Simulation Study

Does anyone have the original file posted by Carl? It seems to be lost / link broken.

Thanks!
by Joe Gayo
Wed Jul 29, 2020 9:39 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor 2020 Activation Experiments
Replies: 9
Views: 483

Re: Fusor 2020 Activation Experiments

Mark, You probably have this mentioned elsewhere, but I can't find the post(s): What are the dimensions of the moderator, materials, and location relative to the cathode ("on-axis" with beam?). If you have time, a diagram would be great! I'm in the process of redesigning my activation setup and look...
by Joe Gayo
Mon Jan 20, 2020 5:52 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: First attempt at activating Indium
Replies: 5
Views: 1145

Re: First attempt at activating Indium

Nice work Mark.

Here is my first gamma spec measurement.

- Indium Foil (100x100x0.1mm) sandwiched with 100x100x50mm LDPE blocks.
- 120sec exposure
- 1in^2 NaI Detector, 900V, 1000sec count
ADE1A604-0DC9-4E44-B4A7-5E08CD141E73.jpeg
1000sec Indium Spec
by Joe Gayo
Mon Sep 09, 2019 12:52 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Joe Gayo's lab tour
Replies: 69
Views: 29250

Re: Joe Gayo's lab tour

New Record @ 4:46pm PST-

Cathode Voltage: 97932V (Ballast Resitor 100k Drop Subtracted)
Cathode Current: 14.38 mA
Pressure (D2): 1.865 Pa (Base Pressure Before Run: 9.866E-5 Pa)
Calibrated TIER: 4.217 E+7 n/sec
Q: 3.50 e-8

I believe n/sec and Q are amateur records.