  Let $k'/k$ be a finite purely inseparable field extension and let $G'$ be a
reductive $k'$-group. We denote by $G=\R_{k'/k}(G')$ the Weil restriction of
$G'$ across $k'/k$, a pseudo-reductive group. This article gives bounds for the
exponent of the geometric unipotent radical $\RR_{u}(G_{\bar{k}})$ in terms of
invariants of the extension $k'/k$, starting with the case $G'=\GL_n$ and
applying these results to the case where $G'$ is a simple group.
