Table 2.

Calculation of the rate of fission neutrons produced by 100 g of ²⁴⁰Pu (the relevant nuclear data were taken from [27]).

Fissioning Species	240Pu
T1/2 [y]	6561
T1/2 [s]	2.07 × 1011
decay constant τ [y]	9466
decay constant τ [s]	2.99 × 1011
decay rate [1/s]	3.35 × 10−12
fission Branching Ratio	5.70 × 10−8
fission rate [1/s]	1.91 × 10−19
atomic mass [amu]	240.05
N atoms/gram	2.51 × 1021
sample mass [g]	100
N atoms in sample	2.51 × 1023
fission rate in sample [1/s]	4.79 × 104
<prompt neutrons>/fission	2.16
neutron rate from sample [1/s]	1.03 × 105