Search found 466 matches

by Jim Kovalchick
Fri Mar 26, 2021 11:53 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Scintillators by Nuclear Enterprises
Replies: 6
Views: 338

Re: Scintillators by Nuclear Enterprises

Look for muons with big block plastic scintillators.
by Jim Kovalchick
Fri Mar 26, 2021 12:02 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Scintillators by Nuclear Enterprises
Replies: 6
Views: 338

Re: Scintillators by Nuclear Enterprises

Not all phoswiches are proton recoil detectors I think your NE 421 may be a Li6 detector. That would make it a thermal neutron detector. See this paper https://ntrs.nasa.gov/api/citations/19650000443/downloads/19650000443.pdf?attachment=true The 401 with the B10 inscription is also likely a thermal ...
by Jim Kovalchick
Thu Mar 25, 2021 8:30 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Scintillators by Nuclear Enterprises
Replies: 6
Views: 338

Re: Scintillators by Nuclear Enterprises

Those are phoswich detectors. I think fast neutron.
by Jim Kovalchick
Wed Mar 24, 2021 6:22 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 21
Views: 2817

Re: One more cube fusor

Finn, My turbo experience is with a Leybold not Pfeiffer, but mine is a similar size. I started using a horizontal alignment recently after always using vertical in the past. I use a bellows right angle valve before the turbo. So, there is a right angle. I also have a KF 40 sized instrument pipe bef...
by Jim Kovalchick
Tue Mar 02, 2021 4:14 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: One more cube fusor
Replies: 21
Views: 2817

Re: One more cube fusor

Just premier work!
by Jim Kovalchick
Sat Feb 27, 2021 11:27 pm
Forum: Images du Jour
Topic: He3 Neutron Detector HDPE moderator
Replies: 5
Views: 798

Re: He3 Neutron Detector HDPE moderator

A lot will depend on whether it is a proportional tube or corona tube. I personally prefer proportional because it is more straight forward. Many of the Russian tubes are corona but not all. Some folks have had good luck with both, and there is good info on the forum. 1300 to 1500 sounds like a typi...
by Jim Kovalchick
Sat Feb 27, 2021 6:39 pm
Forum: Images du Jour
Topic: He3 Neutron Detector HDPE moderator
Replies: 5
Views: 798

Re: He3 Neutron Detector HDPE moderator

That will surely count neutrons for you. The construction looks good. You probably don't need as much hdpe to moderate d d fusion neutrons as you would for a Californium source because d d neutrons are only 2.45 MeV. I'm not suggesting you change your design, Carl Willis did some work someone back t...
by Jim Kovalchick
Sat Feb 27, 2021 6:05 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Silver Activation Demo Cell
Replies: 14
Views: 964

Re: Neutron Silver Activation Demo Cell

I reviewed my data from last night's run. I have the ability to recreate bin sizes on the existing data from the PRA software. In the first second after I shut off the fusor 26 counts were recorded on the silver faced GM. That's an initial count rate of 1560 cpm. The next handful of seconds were clo...
by Jim Kovalchick
Sat Feb 27, 2021 1:05 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron Silver Activation Demo Cell
Replies: 14
Views: 964

Re: Neutron Silver Activation Demo Cell

Tonight I ran the fusor twice. I terminated the first run after a total time of about 12 minutes when counts started to drop presumably from heat. I fan cooled the chamber and started a second run that ended with a run at near peak flux that varied no more than +/- 10% for seven minutes. I collected...