Look at food irradiation using\({}^{{\rm{137}}}{\rm{Cs}}\)and\({}^{{\rm{60}}}{\rm{Co}}\)as sources. Y rays are created from these sources when an equivalent amount of activity is utilised. Even yet, irradiating the same dosage from a\({}^{{\rm{137}}}{\rm{Cs}}\)source takes longer than from a\({}^{{\rm{60}}}{\rm{Co}}\)source.
Cobalt and caesium are two of the most well-known sources of\({\rm{\gamma }}\)rays, according to the literature. As\({\rm{\gamma }}\)rays are electromagnetic radiation, their radiation dosage at any given period is solely determined by their energy (frequency). So, because issue statement states that caesium takes longer than cobalt, we may safely assume that gamma rays from cobalt contain more energy than gamma rays from caesium.
According to the literature, the energy of\({\rm{\gamma }}\)rays from cobalt can range between\({\rm{1}}{\rm{.173}}\)and\({\rm{1}}{\rm{.332 MeV}}\), while the energy of\({\rm{\gamma }}\)rays from caesium is\({\rm{0}}{\rm{.662 MeV}}\).
In any instance, cobalt will always provide a higher radiation dose for the same level of source activity when exposed for the same period of time.
Therefore, cobalt has \({\rm{\gamma }}\) rays with a greater energy level (frequency).
