F. Cardone, R. Mignani, A. Petrucci
We show that cavitation of a solution of thorium-228 in water induces its transformation at a rate 104 times faster than the natural radioactive decay would do. This result agrees with the alteration of the secular equilibrium of thorium-234 obtained by a Russian team via explosion of titanium foils in water and solutions. These evidences further support some preliminary clues for the possibility of piezonuclear reactions (namely nuclear reactions induced by pressure waves) obtained in the last ten years.
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