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by Richard Hull
Sun Nov 28, 2021 11:05 pm
Forum: New User Chat Area
Topic: Is this neutron counter dead?
Replies: 25
Views: 350

Re: Is this neutron counter dead?

I echo what Cai noted, best of luck.

Internal arcing in any gas detector is deleterious, damaging and possibly the end game.

Richard Hull
by Richard Hull
Sun Nov 28, 2021 8:15 pm
Forum: New User Chat Area
Topic: Is this neutron counter dead?
Replies: 25
Views: 350

Re: Is this neutron counter dead?

More than hot enough! If the nearness of this source does not increase the tube count and you are still getting a natural one count per second, the tube might indeed be old or have leaked out a bit of the normal 3He fill gas. It still may count neutrons, but just at a higher than normal background t...
by Richard Hull
Sun Nov 28, 2021 8:03 pm
Forum: Fusor Construction & Operation (& FAQs)
Topic: Fusor from India.
Replies: 2
Views: 80

Re: Fusor from India.

That 60 ma is a peak rating. While old school (non- switching) I would image 30 ma continuous of the average multi-minute fusor run would be the normal maximum expectation. Assuming variac control, as so many of these older systems were, I would imagine 9-20 ma would be a normal fusor current if a s...
by Richard Hull
Sun Nov 28, 2021 7:05 pm
Forum: New User Chat Area
Topic: Is this neutron counter dead?
Replies: 25
Views: 350

Re: Is this neutron counter dead?

Most all neutron counters tend to have a background counts of around 6-10CPM MAX. I suggest that you obtain a hot radium source such as an old clock or military meter face and see if your count rate goes up. If it does, you have a great GM counter and not a neutron counter. A healthy hot piece of ur...
by Richard Hull
Sat Nov 27, 2021 10:08 pm
Forum: High Voltage - Fusor Input Power (& FAQs)
Topic: Another HV Feedthrough
Replies: 8
Views: 2450

Re: Another HV Feedthrough

A couple of years ago there was an offer of free Tungsten wire in the trading post. I got some. Did you see the offering? Is the fellow who offered it still here?

Richard Hull
by Richard Hull
Sat Nov 27, 2021 9:57 pm
Forum: New User Chat Area
Topic: Is this neutron counter dead?
Replies: 25
Views: 350

Re: Is this neutron counter dead?

At the high voltage it is acting as a GM tube and sensitive to anything that happens along, even ripple spikes. You are horribly abusing the tube if not ruining it at such voltages. Many GM tubes operate at 400-900 volts and give negative detection spikes equal to between 1/5 to 1/10 or more of the ...
by Richard Hull
Sat Nov 27, 2021 7:03 pm
Forum: New User Chat Area
Topic: Is this neutron counter dead?
Replies: 25
Views: 350

Re: Is this neutron counter dead?

The tube is proportional and demands a very special charge sensitive preamplifier. You may have destroyed it by over volting it. Such a pulse is indicative of a GM tube response. The tube is indeed a 3He tube and a proper neutron pulse detection should not be able to ever be seen on a low impedance ...
by Richard Hull
Fri Nov 26, 2021 7:24 pm
Forum: FAQs: Vacuum Technology
Topic: FAQ - Ideal diagram of foreline pump system for a fusor or demo
Replies: 0
Views: 40

FAQ - Ideal diagram of foreline pump system for a fusor or demo

The foreline is where all fusion vacuum systems start out. A poor showing here will kill any demo fusor or full fusion system attempts. Below is a base level, idealized, diagram with operation instructions. You will need a good mechanical pump, two valves, a "tee" fitting and some hose, plus, some c...
by Richard Hull
Fri Nov 26, 2021 6:53 pm
Forum: Neutrons, Radiation, and Detection (& FAQs)
Topic: Collection of information about russian SNM tubes
Replies: 25
Views: 16198

Re: Collection of information about russian SNM tubes

The RS-P4 and P7 references in the graphs and table are comparison to the famous industry standard Reuter and Stokes P4 (4ATM 3He) and P7 (7ATM 3He) proportional detector tubes to the Russian tubes. I have since 2004 only used the RS-P4, 21-inch long tube in my neutron detection system.

Richard Hull
by Richard Hull
Fri Nov 26, 2021 5:20 pm
Forum: Images du Jour
Topic: First Light in my First Metal Demo Fusor!
Replies: 8
Views: 471

Re: First Light in my First Metal Demo Fusor!

On all Precision belt drives, the pump to hose connection is their standard superb hose barb with their rubber seal ring. Cherish it!! Use only it!! Replace the hose, of course, and on the other end of the hose put what ever connector you want on it. Never use someone elses hose! Now just a matter o...

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