Search found 2329 matches

by Carl Willis
Sat Feb 22, 2003 4:49 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Iodine Activation
Replies: 4
Views: 3581

Iodine Activation

Well, as promised, I did some activation experiments with iodine. First I had to get enough to be useful, and luckily the Chemistry Department was willing to make a donation of some very old and raunchy periodic acid (HIO4). This stuff is a wicked strong oxidizer, smells bad, is extremely acidic, po...
by Carl Willis
Fri Feb 21, 2003 8:15 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Prompt Neutron Activation Spectrum
Replies: 11
Views: 6311

Prompt Neutron Activation Spectrum

What happens when your fusor neutrons land in borax shielding? For one thing, a 478 keV gamma is released in about 75% of absorbtions by B-10 (and alpha particles are as well.) Tonight I put an NaI(Tl) spectroscopy detector up against a small plastic bottle of borax solution WHILE THE FUSOR WAS RUNN...
by Carl Willis
Tue Feb 18, 2003 8:08 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: activation question
Replies: 7
Views: 3224

Re: activation question

<t>Jon,<br/> <br/> Interesting find! I just called Dr. Freeman at Geneseo to discuss this website. He says a "junior level student probably assembled the page" and that he wouldn't vouch for the information on it, told me to stick with the CRC value. (And, of course, we had a bit of a discussion abo...
by Carl Willis
Tue Feb 18, 2003 8:36 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: activation question
Replies: 7
Views: 3224

Re: activation question

<r>Hi Brian,<br/> <br/> Neutrons can interact with materials in a variety of ways. Fast neutrons, due to their high velocities, generally spend too little time near other nuclei for much of interest to occur. They mainly interact through elastic collisions in which they bounce off nuclei and lose en...
by Carl Willis
Thu Feb 13, 2003 9:22 am
Forum: Images du Jour
Topic: Archived - Typical fusor operation conditions- from activation experiment
Replies: 9
Views: 9462

Re: Pics from activation experiment

Here's another one, showing the manganese juice ready for bombardment with neuts...
by Carl Willis
Thu Feb 13, 2003 9:21 am
Forum: Images du Jour
Topic: Archived - Typical fusor operation conditions- from activation experiment
Replies: 9
Views: 9462

Re: Pics from activation experiment

Here are the other pics (I hope)...
by Carl Willis
Thu Feb 13, 2003 9:18 am
Forum: Images du Jour
Topic: Archived - Typical fusor operation conditions- from activation experiment
Replies: 9
Views: 9462

Archived - Typical fusor operation conditions- from activation experiment

Here are some pictures that illustrate my fusor's operating conditions, and the experimental setup for activating manganese with it. PLEASE SEE the neutron / radiation detection forum for more details. First Image: the data file showing pressure, voltage, current, neut counts vs. time. The values ar...
by Carl Willis
Thu Feb 13, 2003 8:19 am
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Manganese Activation!
Replies: 3
Views: 5207

Manganese Activation!

Remember when Jon Rosenstiel announced his indium activation success and Larry proposed potassium permanganate as something to try in the activation experiment? Indeed, 55 Mn has a sort-of high cross section for thermal neut capture (13.3 barns) and the product 56 Mn has a nice short half-life and a...
by Carl Willis
Wed Feb 12, 2003 4:43 am
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: High frequency high voltage generation
Replies: 10
Views: 6392

Re: High frequency high voltage generation

<t>Greg, you've definitely noted one of the big problems with linacs. At the frequencies that most of them operate, it becomes more sensible to use transmission-line resonators for high Q and high power operation. But--I'll mention it again--the drift-tube linac as we know it does not really become ...
by Carl Willis
Tue Feb 11, 2003 6:13 pm
Forum: Vacuum Technology (& FAQs)
Topic: Further testing
Replies: 5
Views: 3087

Re: Further testing

<t>I have I think the same trap that you do. I usually bake mine overnight, and then let it cool off for a day before use. Of course, push that heater down into the middle of the trap.<br/> <br/> When you change oil, try to flush as much of the diesel out with new pump oil. What type of paraffin oil...