Search found 499 matches

by Jim Kovalchick
Tue Jun 08, 2021 9:29 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Using Silver (or other element) Activation to Quantify Neutron Output
Replies: 12
Views: 549

Re: Using Silver (or other element) Activation to Quantify Neutron Output

Track etching will have less variables and less equipment requirements. Not a bad idea for standards. Does anyone have enough experience that they can comment on repeatability?
by Jim Kovalchick
Sun Jun 06, 2021 3:09 pm
Forum: Vacuum Technology (& FAQs)
Topic: play dough vacuum seal
Replies: 6
Views: 260

Re: play dough vacuum seal

I would not use that as a vacuum bell jar. It is not designed for vacuum and failure could be catastrophic and dangerous.
by Jim Kovalchick
Sun Jun 06, 2021 8:39 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Using Silver (or other element) Activation to Quantify Neutron Output
Replies: 12
Views: 549

Re: Using Silver (or other element) Activation to Quantify Neutron Output

Richard, Mass also effects activation because it sets the macroscopic cross section. It is also why a rhodium plated mirror isn't that useful for activation even though there is plenty of surface area. I do agree with you though about surface area being important for detection. The detection geometr...
by Jim Kovalchick
Sat Jun 05, 2021 6:26 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Using Silver (or other element) Activation to Quantify Neutron Output
Replies: 12
Views: 549

Re: Using Silver (or other element) Activation to Quantify Neutron Output

Bob, In theory activation analysis should be able to benchmark flux. There are some challenges though. Activation time is critical. Ideally, activation should be done to saturation. Keeping flux steady fot the entire activation period is also helpful. Excursions up or down will impact the count rate...
by Jim Kovalchick
Sat Jun 05, 2021 11:35 am
Forum: Vacuum Technology (& FAQs)
Topic: play dough vacuum seal
Replies: 6
Views: 260

Re: play dough vacuum seal

Please follow the forum rules for posting. At a minimum you need to use your real name. Regarding play doh, mashed potatoes would be cheaper. There are lots of other household semi-solids you could try. What about flex seal? If it works you could make a commercial. In all seriousness, I am myself wi...
by Jim Kovalchick
Thu Jun 03, 2021 4:10 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Operational Fusor Audit
Replies: 10
Views: 644

Re: Operational Fusor Audit

Mine is operational and could activate silver within an hour.
by Jim Kovalchick
Wed Jun 02, 2021 6:42 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Financial Entropy
Replies: 4
Views: 271

Re: Financial Entropy

Joe, I recall some similar discussion on the forum in the past especially around standardizing neutron calibration. For example, it is well within reason to calibrate silver foil activation to the point that it could be compared from one system to the next. For example, a silver foil of prescribed d...
by Jim Kovalchick
Sat May 29, 2021 11:30 pm
Forum: Images du Jour
Topic: Finn Hammer, fusor update.
Replies: 44
Views: 5843

Re: Finn Hammer, fusor update.

In addition to the chamber conditioning that Frank and I spoke of, the blue haze could also be your viewport glass fluorescing. Especially with that tube grid, as you noticed, there is a secondary electron beam hitting your glass. Borosilicate fluoresces blue.
by Jim Kovalchick
Sat May 29, 2021 7:33 pm
Forum: Images du Jour
Topic: Finn Hammer, fusor update.
Replies: 44
Views: 5843

Re: Finn Hammer, fusor update.

Finn,
Great looking plasma pics!

Regarding haze, fusors tend to look hazy until the chamber conditions through heating. I'm betting yours will look clearer soon.

Jim K
by Jim Kovalchick
Sat May 29, 2021 1:41 am
Forum: FAQs: Fusor Construction & Operation
Topic: FAQ - Make your own deuterium from heavy water!! The video
Replies: 43
Views: 5515

Re: FAQ - Make your own deuterium from heavy water!! The video

This little tidbit could belong other places, but just a note on the impact of moisture and in my case, a droplet, making its way into a variable leak valve like the one I use to control the flow of d into my system. The moisture will build up as a film in the sealing surfaces and turn the variabili...