A personal protective device intended to shield the chest and/or breast area of an individual (i.e., the patient, operator, or other attending person) from unnecessary exposure to radiation from diagnostic or therapeutic medical and dental procedures. Some have either attached or detachable collars used for neck and thyroid protection. Bibs used in diagnostic x-ray and nuclear medicine typically consist of a fluid resistant outer covering that surrounds a thin sheet of lead (Pb) or lead-equivalent material. Bibs used for neutron attenuation are composed of hydrogenous materials; those used in mixed beta-gamma radiation field may have layers of both hydrogenous and lead-equivalent materials.