This is a 10 µCi source with a half-life of 30.08 years. It emits β and γ radiation. This radioactive source is mounted in a 2.5 cm diameter sealed plastic disk and requires no licensing. Source is USNRC License Exempt (US only). Outside the US, consult local laws and regulations. This source is required for use with the Complete Compton Scattering (SF-7277).