a$)$ Meta$-$Technetium$-99$ is a radioisotope commonly used in radiopharmaceutical applications. It is obtained from the decay of Molybdenum$-99,$ which is itself produced artificially either by neutron bombardment of a target material or chemically separated from the products of uranium$-235$ fission. Describe the process by which meta$-$Technetium$-99$ may be isolated ready for incorporation into a radiopharmaceutical, starting with the methods for obtaining Molybednum$-99.$ Use the schematic drawing of radionuclide generator for your explanation.