In reply to Jones Beene's message of Sun, 13 Jun 2010 19:58:43 -0700: Hi, [snip] > > >Robin > > > >2) No radiation was detected. > > > > > > > >According to the Dufour paper : > >"No harmful radiation was measured, which is attributed to the presence of a >lead shield absorbing ? emission occurring during the run and to the very >short period of the unstable species formed during the run and decaying >after shut down." > > > >http://www.journal-of-nuclear-physics.com/files/Nuclear%20signatures%20-%20Jacques%20Dufour.pdf
Most of the species that would be created do indeed have short half lives, but not all of them. Those with longer half lives should be detected upon analysis after the run. E.g. Ni-58 + p -> Cu-59 which has a half-life of 82 sec and decays to Ni-59 which in turn has a half-life of 75000 years. Since most of the Ni is Ni-58, this is the path we can expect most single proton fusion reactions to take. IOW they should have been left with lots of nice radioactive Ni-59 (and also some Cu-61 which has a half-life of 3.5 hours). Dufour also says as much. > > >Lead shielding will usually keep radiation from being detected :-) See Dufour paper. Even 40 cm thick lead shielding would still leave about 1 gamma per sec per cm^2 at 1 m from the tube which is easily detectable, and that's assuming proton capture rather than neutron capture. For neutron capture the gamma emission would be 5000 times higher (which would drive a Geiger counter nuts). 1 / sec = 60 per minute, and previous measurements of background radiation I have made at home yielded a count of about 6 / minute / cm^2, less in other places. IOW 60 per minute / cm^2 is at least 10 times above background, and that's 1 meter removed from the tube. At closer distances the count would be higher. BTW just guessing from the drawings in the patent application, the lead layer doesn't appear to be anywhere near 40 cm thick (though no actual measurements are provided). Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/Project.html
