Yes, I think they are pretty much all PIR sensors now. Actually, you would only need ONE motion detector, since a motion detector needs TWO crystals in it to work. However, not all have lithium tantalite crystals, some have tri-glycine sulphate, so those might not work as well. Then there's questions of geometry and size, which I don't know. I sort of meant cannibalising the motion detector in a McGuyverish sense. ;-)
If you only used hydrogen from tap water, then the reaction would only be (1/6500)^2 as strong, 2E-8! The D+D->He3+n reaction has 2 deuterium nuclei going into it, so the rate of this reaction is proportional to the square of the deuterium abundance. And I don't think any of the other possible nuclear reactions could take place, except possibly D+T.
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timeasmymeasure
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Date: 2006-03-02 04:14 pm (UTC)If you only used hydrogen from tap water, then the reaction would only be (1/6500)^2 as strong, 2E-8! The D+D->He3+n reaction has 2 deuterium nuclei going into it, so the rate of this reaction is proportional to the square of the deuterium abundance. And I don't think any of the other possible nuclear reactions could take place, except possibly D+T.