Fusor Forums

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.

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

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...

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...

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...

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

Thanks!

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...

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

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.