A portable or mobile rigid barrier designed to shield patients and healthcare professionals from unnecessary exposure to radiation used in diagnostic or therapeutic medical procedures. It provides a physical radiation-attenuating barrier between an individual and a source of primary or scattered radiation. It may be a stand-alone device or intended to be integrated within an electronic system; the panel itself is not electronic. The types of materials used depend on the type of radiation to be attenuated [e.g., those used in diagnostic x-ray and nuclear medicine consist of lead (Pb) or lead-equivalent materials, and those used to attenuate neutrons are composed of hydrogenous materials].