Search found 10977 matches

by Richard Hull
Mon Jan 14, 2002 7:12 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Latest project
Replies: 14
Views: 2960

Re: Latest project

<t>Nice looking detector Jon!<br/> <br/> I was a bit stunned at the count being as high as it was. My BF3 units mihgt give 0.5cpm. The PMT unit with BC-720 also is in that range as well. Perhaps you will have to dial the discrimination up a bit. It would take a known neutron source to tell what that...
by Richard Hull
Thu Jan 10, 2002 4:38 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Tritium source for the amateur ????
Replies: 8
Views: 2502

Re: Tritium source for the amateur ????

<t>The x-rays from our devices are no-issues provided the tiniest bit of caution is taken.<br/> <br/> The problems of operating a soft x-ray producing device pails by comparison, so far as the authorities are concerned, to taking a licensed, sealed tritium source released to the public domain, openi...
by Richard Hull
Tue Jan 08, 2002 6:24 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Tritium source for the amateur ????
Replies: 8
Views: 2502

Re: Tritium source for the amateur ????

<t>The answer is yes and no. <br/> <br/> YES.... There is physically enough tritium in the watch hands for use in the fusor for a single shot.<br/> <br/> NO.... You should not do it. IT IS ILLEGAL and a federal crime to transfer tritium from any manufacturered device to any other device without a NR...
by Richard Hull
Mon Jan 07, 2002 10:03 pm
Forum: Fusion --- Past, Present, and Future
Topic: NIF sailing forward.
Replies: 9
Views: 2789

NIF sailing forward.

<r>The National Ignition Facility's website looks like it is sailing forward, if slowly. You folks should visit the site and see the slide shows (hompage) and movies.<br/> <br/> <URL url="http://www.llnl.gov/nif/nif.html">http://www.llnl.gov/nif/nif.html</URL><br/> <br/> Once the page comes up, just...
by Richard Hull
Fri Jan 04, 2002 5:38 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: PIPS Detectors
Replies: 2
Views: 1616

Re: P.I.P.S. Detectors

<t>I now have 9 of those PIPS detectors myself. They do not require a vacuum to detect per se.<br/> <br/> A vacuum is used to assure that the energies of the alpha's arrive unsullied for spectroscopic puposes. The normal vacuum needed is only 100 microns or so. Most alpha sources are still placed on...
by Richard Hull
Fri Jan 04, 2002 4:58 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: ZnS(Ag) screens
Replies: 4
Views: 1604

Re: ZnS(Ag) screens

<t>Hey, don't you think for one moment Rutherford troubled himself with counting scintillations. I have read numerous account of his later famous students and assistants who all complained that being lashed to a mast was no worse than working under Rutherford as a lab assistant or undergrade with ma...
by Richard Hull
Wed Jan 02, 2002 7:11 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Thanks Richard Hester!
Replies: 0
Views: 971

Thanks Richard Hester!

<t>All,<br/> <br/> Richard Hester, in his Ho, Ho, Ho posting just prior to this one left us all a nice gift for Xmas.<br/> <br/> I am back after two weeks of vacation and have just been to the files section and printed out his work on the 3 transistor Hamamatsu PMT preamp.<br/> <br/> As an old elect...
by Richard Hull
Wed Jan 02, 2002 6:21 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: BC-720 Revisited
Replies: 11
Views: 2502

Re: BC-720 Revisited

<t>I will endeavor to rephotograph the big 5" BC-720 and repost the image in image du jour forum this evening.<br/> <br/> Basically, the way I figure that they make the thing is to make up several different sized plastic rings and coat the outside of them thoroughly all around with P-4 phosphor. Nex...
by Richard Hull
Tue Jan 01, 2002 7:50 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: Pulsed Fusor #3: Case Study of a 1HP Fusor
Replies: 5
Views: 3392

Re: Pulsed Fusor #3: Case Study of a 1HP Fusor

<t>Good luck Larry.<br/> <br/> Getting those deuterons to answer those idealized calcs is going to be a real chore.<br/> <br/> The problem comes in getting the bulk of the input energy transferred to make real fusion events. The observed efficiency of conversion to fusions is on the order of .000000...
by Richard Hull
Sat Dec 29, 2001 7:21 am
Forum: Fusor Construction & Operation (& FAQs)
Topic: French Fusor: summary translation & ?'s
Replies: 3
Views: 1707

Re: French Fusor: summary translation & ?'s

<t>I don't wonder at the lack of star mode! One will never see a star until the system is very clean and most of the water vapor is pumped out. With tape and freshly soldered grids, outgass and virtual leak are the active terms.<br/> <br/> The star forms without fail in long pumped, clean systems at...