<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Pu</mml:mi></mml:mrow><mml:mrow/><mml:mrow><mml:mn>240</mml:mn></mml:mrow><mml:mrow/><mml:mrow/><mml:mprescripts/><mml:mrow><mml:mn>94</mml:mn></mml:mrow><mml:mrow/><mml:mrow/><mml:mrow/></mml:mmultiscripts></mml:mrow></mml:math>and Its Spontaneous Fission

TL;DRAbstract

Measurements of spontaneous fission of $_{94}\mathrm{Pu}^{239}$ show that neutron irradiation of this substance forms a body with a high spontaneous-fission rate. This substance is with practical certainty $_{94}\mathrm{Pu}^{240}$ and has a spontaneous-fission rate of approximately 1.6\ifmmode\times\else\texttimes\fi{}${10}^{6}$ fissions/g hr. $_{94}\mathrm{Pu}^{239}$ itself has a spontaneous-fission rate of the order of 40 fissions/g hr.

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