$2.$ Calculate the dose rate and the absorbed dose for the ceric sulfate dosimetric solution that was irradiated with Co$-60$ source during $3$ hrs$.$ The absorbance of the irradiated dosimetric solution $($Ce$4+),$ measured with UV$/$Vis$-$spectrophotometer in $1$ cm cuvettes at the wavelength $=320$ nm$,$ decreased from $1\mathrm{.}01($initial$)$ to $0\mathrm{.}21($irradiated$).$ The molar absorptivity of ceric ions for this wavelength is $\backslash$epsi $320=561$ L mol $1$cm $1,$ density of the dosimetric solution is $\backslash$rho $=1\mathrm{.}025$ g$/$mL and the G value for the cereous$-$ion yield is $2\mathrm{.}3$ molecules$/100$ eV for the gamma source $60$Co$.$