  We report the measurement of the TKE release in the fast neutron induced
fission of $^{240}$Pu and $^{242}$Pu. The results are compared to the
predictions of the GEF model, the CGMF model, and the model of Denisov and
Sedykh as well as previous experimental work on these reactions. Our absolute
measurements of the TKE release are in good agreement with the previous
measurements of Nethaway \textit{et al.} for the interaction of 14.8 MeV
neutrons with $^{240}$Pu \cite{Nethaway} and of Winkelmann and Aumann for the
interaction of 15 MeV neutrons with $^{242}$Pu \cite{Winkelmann}. The general
trends of the measured TKE values agree with phenomenological models but the
variances of the TKE distributions are significantly less than predicted by
various models. The mean post neutron emission TKE release decreases non-
linearly with increasing neutron energy and can be represented as TKE(MeV) =
175.8 $\pm$ 0.3 - (2. 4 $\pm$ 0.8)log$_{10}$E$_n$ - (1.4
$\pm$0.4)log$_{10}$E$_{n}^2$ for $^{240}$Pu and TKE(MeV) = 177.1 $\pm$ 0.3 -
(1.2 $\pm$ 0.9)log$_{10}$E$_n$ - (1.8 $\pm$0.5)log$_{10}$E$_{n}^2$ for
$^{242}$Pu.
