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In page Iridium:

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A radioisotope of iridium, 192Ir, is dangerous, like other radioactive isotopes. The only reported injuries related to iridium concern accidental exposure to radiation from 192
Ir
used in brachytherapy.[3] High-energy gamma radiation from 192
Ir
can increase the risk of cancer.
External exposure can cause burns, radiation poisoning, and death. Ingestion of 192Ir can burn the linings of the stomach and the intestines.[4] 192Ir, 192mIr, and 194mIr tend to deposit in the liver, and can pose health hazards from both gamma and beta radiation.[5]