A radioactive gold ring made from improperly salvaged gold radon seeds caused dermatitis which has lasted for over 40 years. The source of the radiation was lead 210, a beta emitter with a half-life of 22 years.
Richard A. Leone. Radiodermatitis Caused by a Radioactive Gold Ring. JAMA. 1968;206(9):2113–2114. doi:10.1001/jama.1968.03150090189033