The frequencies at which the current amplitude in an LCR series circuit becomes $\frac{1}{\sqrt{2}}$ times its maximum value, are $212 \mathrm{rad} {\mathrm{s}}^{-1}$ and $232 \mathrm{rad} {\mathrm{s}}^{-1}$. The value of resistance in the circuit is $R=5 \mathrm{\Omega }$. The self inductance in the circuit is _____ $\mathrm{mH}$.