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Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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Would the below picture work for a neutron source using electron capture, if it was at atmosphere pressure and over 140kv for tungsten(blue)? What would be the mean free path of a neutron at atmosphere pressure and 100kev.
That all depends on the mean free path of aluminium. Generally one just wraps the source in aluminum foil, that''s all that is needed really. It is the interaction of alpha particles upon the nucleus of the light atoms which causes the transmutation and neutron release. Even a sheet of paper will stop nearly all alpha particles.
Do have some proper neutron shielding if you are going to use a high activity source though. HDPE works great and is cheap and user friendly. Water (or any other hydrogen bearing compound of high density) also works really well.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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I was wondering if you have any information on a proton decaying into a neutron at 1.29MeV. Just thinking if you had a 1cm sparkgap with hydrogen in the middle, charged to 1.5MV weather it will make neutrons.
I'm not familiar with proton decay off the top of my head, but a 1.5MV spark gap would be on the order of >1meter across depending on fill gas and pressure. The mean free path at pressures needed to stand off 1.5MV would be so small that I don't think you would get any useable product out of the set up, even if you could induce proton decay (which I don't think happens just by accelerating a proton to 1.29MeV).
If you want a safe neutron source go with a simple urchin as I posted about above. Even if you got a high activity alpha source and an ideal Be target you should still be in relatively safe "waters" so to speak. It isn't going to be like a commercial neutron source, but it is enough to do experiments with transmutation/activation and such.
Registered Member #4266
Joined: Fri Dec 16 2011, 03:15AM
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If say a marx charged up two electrodes 1cm apart, in close to vacuum, with D2 in the middle would that accelerate electrons one way, and protons the other way?
With two electrode 1cm apart, you should only loss 30kv for the e-feild, how would you stop a cw or marx from not reaching there full voltage, wouldn't they top out at 30kv.
Never got to go to college. I picked it up frequenting various physics related forums and mail lists. Geiger Counter Enthusiasts list has a lot of nuclear physicists who are happy to share their knowledge as well as industry workers and experimenters who have hands on experience.
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Creating a neutron source
