High-dose-rate temporary brachytherapy (another name for sealed source radiotherapy) is used to treat some head and neck

Question

High-dose-rate temporary brachytherapy (another name for sealed source radiotherapy) is used to treat some head and neck cancers. Brachytherapy uses a radioisotope that is sealed in either a protective capsule or wire and placed next to or inside the area being treated. The capsule or wire allows the ionizing radiation to escape and destroy the nearby cancer cells, while keeping the radioisotope from moving within the tissue. In temporary brachytherapy, the radioactive source is removed from the patient after a short period of time. Suppose that iridium-192 is applied to a tumor for 6.5 min. What is the atomic number of iridium?

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