  Relative $K$ x-ray intensities of $Mn$ in $Mn$, $MnO_{2}$, $LaMnO_{3}$ and
$La_{0.7}B_{0.3}MnO_{3}$ ($B$ = $Ca$, $Sr$, and $Ce$) systems have been
measured following excitation by 59.54 keV $\gamma$-rays from a 200 mCi
$^{241}$Am point-source. The measured results for the compounds deviate
significantly from the results of pure $Mn$. Comparison of the experimental
data with the multiconfiguration Dirac-Fock (MCDF) effective atomic model
calculations indicates reasonable agreement with the predictions of ionic model
for the doped {manganites except} that the electron doped
$La_{0.7}Ce_{0.3}MnO_{3}$ and hole doped $La_{0.7}Ca_{0.3}MnO_{3}$ compounds
show some small deviations. The results of $MnO_{2}$ and $LaMnO_{3}$ deviate
considerably from the predictions of the ionic model. Our measured
$K\beta/K\alpha$ ratio of $Mn$ in $La_{0.7}Ca_{0.3}MnO_{3}$ cannot be explained
as a linear superposition of $K\beta/K\alpha$ ratios of $Mn$ for the end
members which is in contrast to the recent proposal by Tyson et al. from their
$Mn$ $K\beta$ spectra.
