Search found 10939 matches

by Richard Hull
Thu Nov 29, 2001 4:17 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Spinthariscope Blues, Pt. 1
Replies: 4
Views: 1672

Re: Spinthariscope Blues, Pt. 1

<t>The spinthariscope responds mainly to the heavy alpha particles only for human optical purposes. (there ain't a whole lot of energy in a scintillation) Betas and gammas don't cut it. So when making a spin-scope up, do not cover the rad material with anything thicker that a few angstroms!!! This w...
by Richard Hull
Wed Nov 28, 2001 6:48 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Running The Fusor on a single charge of Deuterium?
Replies: 1
Views: 1509

Re: Running The Fusor on a single charge of Deuterium?

<t>Tom,<br/> <br/> It sounds like you have a nice system there.<br/> <br/> It is certainly possible that once pumped down to near diff pump levels, (10e-5 torr or better), and all leaks are sealed, that you might be able to just fill to 100u with D2 and then pump again to a few microns. If you back ...
by Richard Hull
Wed Nov 28, 2001 12:41 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: My First Scintillator
Replies: 6
Views: 1954

Re: My First Scintillator

<t>Yes. Sorry Tom, I have trouble with events over two months old.. Ha Ha.<br/> <br/> You bought your PMT off of someone who either bought it off me at the Richmond Hamfest, one of my Teslathons, or at the Rochester Teslathon I attend yearly. Sorry about the mix up in the details. Those things have ...
by Richard Hull
Tue Nov 27, 2001 10:23 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Lithium Detection
Replies: 3
Views: 1499

Re: Lithium Detection

<t>Lithium 6 is stable and will never decay. To get enough Li6 to detect with an RGA even with an electron multiplier to extend the range to 10-13 torr, You would have to do one heck of a lot of fusion. The He3 + He4 fusion is not an easy amateur reaction either. <br/> <br/> A lot of this has been h...
by Richard Hull
Tue Nov 27, 2001 6:21 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Re: Plastic Scintillator Preamp Circuit
Replies: 0
Views: 1128

Re: Plastic Scintillator Preamp Circuit

Really nice work and superb design. Those not printing this out, do so at their own peril. While rather component laden, it is really a work of art and is the plus ultra of preamps.



Richard Hull
by Richard Hull
Tue Nov 27, 2001 4:36 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: My First Scintillator
Replies: 6
Views: 1954

Re: My First Scintillator

<t>That three transistor pre-amp schematic is one I drewup from the circuit board (reverse design) and distributed over two years ago when I offered a gang of those tubes and amps to the list. Jim Lux bought one at that time and posted all the stuff I sent on his site at that time. I once was awash ...
by Richard Hull
Tue Nov 27, 2001 4:26 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: It Works!
Replies: 4
Views: 1953

Re: It Works!

<t>Good going Jon. Welcome to the hands on group here. I have added your name to the plasma club listing on the fusioneer list. (posted earlier and amended/edited as needed constantly). I also included Mark Rowley (assembling parts).<br/> <br/> Anyone else assembling parts, or have images of a worki...
by Richard Hull
Mon Nov 19, 2001 3:59 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Jon Rosenstiel's Demo Fusor
Replies: 5
Views: 2225

Re: Jon Rosenstiel's Demo Fusor

<t>I concure with Adam Parker.............<br/> <br/> Really sweet and clean Jon. Great work!!<br/> <br/> Any time you dip into the "fives" (10e-5 torr). you have a good clean system. More than clean enough for fusor work. Heck, the "fours" show good vac technique!<br/> <br/> We look forward to your...
by Richard Hull
Mon Nov 19, 2001 3:14 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Photomultiplier: Oops!!!!
Replies: 12
Views: 2061

Re: Photomultiplier: Oops!!!!

<t>I can't remember, but I believe those PMTs were 30 inch jobs. I am also quiet sure that the $3000.00 price on those Hamamatsu tubes was not our price, but a contract price for the lot! If they appeared on e-bay I would grab one for a door stop. Can any one fathom what a 30" diameter, 2" thick BC-...
by Richard Hull
Fri Nov 16, 2001 10:34 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Surface barrier detector
Replies: 2
Views: 1246

Re: Surface barrier detector-update

<t>After having a few days to "monkey" around with the SB detector, I note that there is no background count, per se. <br/> This is due to the nature of the detector which, in my case, is designed for detection of only heavy charged particles.<br/> <br/> The depletion region depth on my unit is only...