Consider a line source of length \(50 \mathrm{~cm}\) and with strength of \(10^{4}\) gammas \(/ \mathrm{cm} / \mathrm{s}\) and surrounded by vacuum. It emits two gammas of energy 200 and \(1250 \mathrm{keV}\) with intensities \(30 \%\) and \(70 \%\). Find the gamma flux at two points, one which is \(20 \mathrm{~cm}\) away and \(20 \mathrm{~cm}\) above the lower end of the source and another which is \(40 \mathrm{~cm}\) away and \(25 \mathrm{~cm}\) below the lower end of the source.