> In Aussie Guy's summary of the key points of the show he stated "Heating is > via low energy Gammas hitting the lead shielding."
In that case we'd be talking about liquid lead shielding. 3 cm would reduce 511 keV gamma by about 99%. Still - the equivalent of 10 kW x .01 would escape and Rossi would be dead, his product considered extremely hazardous and chances for a home unit below zero. Can't be.