Ir 192 is really not that dangerous.
https://www.cdc.gov/nceh/radiation/emergencies/isotopes/iridium.htm
Exposure to Ir-192 can increase the risk for cancer because of its high-energy gamma radiation. External exposure to Ir-192 can cause burns, acute radiation sickness, and even death. Internal exposure could occur only if a person were to swallow one of the Ir-192 seeds or pellets. Internal exposure from Ir-192 could cause burns in the stomach and intestines if the high-energy industrial pellets are swallowed. Ir-192 seeds and pellets would be excreted in the feces. Long-term health effects of internal exposure would depend on how strong the seeds or pellets were and how long they stayed in the body.
Depending upon the amount of ir192 it could be fatal in minutes.
Most industrial “xray” is actually performed with ir192 sources.
Over the years there have been accidents and occasional intentionally caused incidents with industrial strength sources.
If you search a person will find the after reports of these, going back into the 50s.
Anything that can create an image after traveling 6 to 10 feet and penatrating an inch or more of steel had the ability to damage biological objects.