Search found 10136 matches

by Richard Hull
Tue Dec 01, 2020 5:43 pm
Forum: Announcements and Site Administration Topics
Topic: Scroungers club deleted
Replies: 30
Views: 2909

Re: Scroungers club deleted

Running a fusor to get the numbers back is, indeed, not a fun time. Yes, I have the free time, but it all goes back to commitment. A refresher on operation can be a good exercise that will pay dividends showing that we old hands "still got it" and that thing called a reactor in the corner, the garag...
by Richard Hull
Tue Dec 01, 2020 1:37 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection moderator embedded activation!
Replies: 26
Views: 3100

Re: Neutron detection moderator embedded activation!

Thanks, I often correct later in a clear moment of re-read. I changed "to" in the first sentence to "too" just now. I tend to type faster than I should. Sometimes I re-read posts I've done 3-10 years ago and find faux pas that need to be corrected. Mostly, it is the FAQs.

Richard Hull
by Richard Hull
Tue Dec 01, 2020 12:42 am
Forum: Announcements and Site Administration Topics
Topic: Scroungers club deleted
Replies: 30
Views: 2909

Re: Scroungers club deleted

Jon brought up a point that all any amateur fusioneer would need to do to be an elite is just run his fusor and do activation. As he said, "Is that a thing?" Well yes, it is. Many, many in the neutron club just wanted the merit badge and are now history, long gone, evaporated. They did fusion, yes, ...
by Richard Hull
Mon Nov 30, 2020 8:04 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection moderator embedded activation!
Replies: 26
Views: 3100

Re: Neutron detection moderator embedded activation!

Wow! This is a rolling post....I think I think too much after thinking and posting. (if you can decipher that sentence, you may need help) Bill Kolb and I have been musing about my charts and graphs. I first noticed, during our discussions the intrinsic wild high count gyrations always seen during t...
by Richard Hull
Mon Nov 30, 2020 7:22 pm
Forum: Files
Topic: Neutron Detection Methods and Instruments
Replies: 3
Views: 136

Re: Neutron Detection Methods and Instruments

That was a fabulous buy!!! (you stole them!) I think I had to pay about $70 or so for my set back in 1999. You almost never find a set, but have to buy them piecemeal. Volume 1 is the rarest of them all as it contains 95% of all the data useful to the amateur or casual neutron metrologist. (gobbled ...
by Richard Hull
Mon Nov 30, 2020 6:06 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection moderator embedded activation!
Replies: 26
Views: 3100

Re: Neutron detection moderator embedded activation!

I feel I must explain the red line in the graphs fully to those not so well heeled in statistics. 1. The Red line is the arithmetic mean , "average", of a full 10 minute long series of 5 sec readings from the un-activated metal probe. A total of 120 individual readings. This is often called "backgro...
by Richard Hull
Mon Nov 30, 2020 5:22 pm
Forum: Files
Topic: Neutron Detection Methods and Instruments
Replies: 3
Views: 136

Re: Neutron Detection Methods and Instruments

Good catch Joe. I note in the preface that I have 3 of the 4 books referenced there in my radiation library here. I have the full set of volumes produced in Fast Neutron Physics series and the later follow on volume. By 1965, neutron measurement was pretty well locked down. Helium3 was in abundance,...
by Richard Hull
Sun Nov 29, 2020 9:29 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Neutron detection moderator embedded activation!
Replies: 26
Views: 3100

Re: Neutron detection moderator embedded activation!

Keeping fusor V busy and blasting rhodium up a bit. I attach the graph of today's run. Got over 100kcpm neutron counts.

Richard Hull
by Richard Hull
Sun Nov 29, 2020 9:24 pm
Forum: Vacuum Technology (& FAQs)
Topic: Home built mass spectrometer
Replies: 12
Views: 377

Re: Home built mass spectrometer

Spectrometers are definitely in the fusor column as there are many spectrometers that can be brought to bear on this work and nuclear work in general. Unfortunately the best are expensive or present a would-be builder with a steep learning curve. Lucky surplus finds can reduce the cost of profession...
by Richard Hull
Sun Nov 29, 2020 3:07 pm
Forum: Vacuum Technology (& FAQs)
Topic: Home built mass spectrometer
Replies: 12
Views: 377

Re: Home built mass spectrometer

I would think to turn 2.1mev electrons electrostatically you would need a gang o' voltage or a larger device. Electromagnetic deflection requires a gang o' gauss easily obtained in a small gap electromagnet. Instead of a gang o' volts you need a gang o' amps, much easier to work with and easy to con...