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Discussion in 'Home Power and Microgeneration' started by Tom P, May 5, 2012.

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  1. Tom P

    Tom P Guest

    I've been half following some of the discussions on this group, maybe
    someone can fill me in some details.

    I've gotten the impression that the way these things work is by
    accelerating deuterium or tritium ions so that enough collisions occur
    to release energy.

    So we have for example:
    1D2 + 1D2 -->2He3 (0.82 MeV) + 0n1 (2.45 MeV)

    This reaction is actually used in a commercial neutron generator, so in
    terms of proof of principle, so far so good. There are other reactions,
    but let's take this as a working example.

    Where I get unstuck is with the numbers. The commercial device in
    question consumes around 2-3 kW of power and produces 10^7 neutrons per
    That means that as a by-product, it produces 10^7 x 2.45 MeV, or
    24500000 MeV of energy per second.
    That sounds a lot, but if you convert into watts and joules that comes
    out as 0.000003925334385 watts. Hmm.

    Ok, well let's suppose that we could up the efficiency by a factor of
    several million so that it produces more energy than it consumed - say
    10kW. That's 62415064799632350 MeV per second, so you would be
    generating around 6x10^24 neutrons per second. These neutrons are also
    carrying the energy that you are trying to capture, so you'll need a
    suitable moderator to slow them, say water, and something to absorb
    them. Whatever absorbs them needs to do so extremely efficiently so that
    you don't get too many neutrons leaking out of your basement and making
    your entire house radioactive, not to mention your wife and kids.

    Maybe there's some other technology, but the bottom line is that it
    seems you have a lot of neutrons to look after, and this doesn't really
    sound like a sound DIY project to me.
    Can someone comment? Are my numbers all wrong?
  2. Vaughn

    Vaughn Guest

    Your assumption on the physics of the reaction must be wrong. From what
    I've read, those things don't generate any significant number of
    neutrons. Take it from an old nuke, no government is about to allow you
    to have any significant generator of neutrons in your basement.

  3. j

    j Guest


    More here:

    The key is providing sites in the catalyst for nuclear reactions (not
    necessarily fusion) to take place.


    Take it from an old nuke, no government is about to allow you
  4. Tom P

    Tom P Guest

    Jeff,just what kind of nuclear reactions are you talking about, if not
    fusion? Just show me a simple equation like this one:
    1D2 + 1D2 -->2He3 (0.82 MeV) + 0n1 (2.45 MeV)
  5. Tom P

    Tom P Guest

    Thanks for the tip. I find

    There is no way you can get any net energy out of a reaction between
    hydrogen and nickel, either nuclear or otherwise. If it's chemical just
    work out how much energy you need to produce atomic hydrogen.

    If it's nuclear, then work out the precise atomic weights and binding

    Naturally occurring nickel (Ni) is composed of five stable isotopes;
    58Ni, 60Ni, 61Ni, 62Ni and 64Ni with 58Ni being the most abundant.

    There are 29 isotopes of copper. 63Cu and 65Cu are stable, with 63Cu
    comprising approximately 69% of naturally occurring copper; they both
    have a spin of 3/2.[12] The other isotopes are radioactive, with the
    most stable being 67Cu with a half-life of 61.83 hours.[12]

    So supposing that the reaction involves stable isotopes, the possible
    reactions would seem to be
    62Ni28 + H -> 63Cu29 3%
    64Ni28 + H -> 65Cu29 0.1%
    61Ni28 + D -> 63Cu29 1%

    The percentages are the relative natural occurrences of the isotopes.
    Deuterium occurs naturally at around 0.015%.

    The problem is that all elements around this atomic weight have the
    highest binding energies - see
    - this means that it is hard to see how nuclear reactions can produce
    any excess energy.

    If have yet to find anything published by Rossi that shows how excess
    energy can be produced.
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