The iridium element is not radioactive, and its current uses are mainly in the manufacture of nibs for high-end gold pens, crucibles for scientific research, and the production of scientific instruments, thermocouples, resistance wires, etc. Pure iridium is used exclusively in aircraft spark plugs.
In the early days, iridium was considered a harmful element. Extensive research conducted in the mid-to-late 19th century dispelled this misconception, so there is currently no evidence that direct contact causes much harm