A cesium source in the form of a disc of radius \(3 \mathrm{~cm}\) has a uniform activity of strength \(2 \mathrm{mCi} / \mathrm{cm}^{2}\). What is the dose at a point \(\mathrm{P}, 10 \mathrm{~cm}\) from the disc along the central axial direction. Take the dose conversion coefficient to be \(10^{-6} \mathrm{R} / \mathrm{cm}^{2} / \mathrm{s}\) for Cs- 137 gammas.