Lead doors, also known as radiation protection lead doors, are special protective doors designed to shield against ionizing radiation such as X-rays and gamma rays. They rely on high-purity lead plates to absorb and attenuate radiation, preventing radiation leakage. They are dedicated protective equipment for the entrances and exits of radiation rooms.

Protective lead plates are metal sheets made from No. 1 high-purity electrolytic lead through rolling and pressing. They are the basic shielding material for X-ray and gamma-ray protection engineering, widely used for the walls, ceilings, and floors of radiation rooms, and are also the core shielding layer material for protective equipment such as lead doors, lead rooms, and lead boxes. Relying on its high atomic number and high density, it absorbs and attenuates ionizing radiation energy through the photoelectric effect and Compton effect. Its protective capability is measured in lead equivalent (mmPb), and the thickness of the pure lead plate corresponds approximately one-to-one with its lead equivalent.

Lead glass (radiation protection lead glass) is a special optical protective glass with a high content of lead oxide. It can simultaneously achieve X-ray and gamma-ray shielding and visible light transmission observation. It is widely used in observation windows of radiation room walls, observation openings of lead doors, lead screens, and lead room windows. It is the only visible shielding component in radiation protection engineering.

Barium sulfate (BaSO₄) is divided into two main categories: natural barite powder and precipitated barium sulfate. It is a white inorganic powder with stable chemical properties, good acid and alkali resistance, good weather resistance, and is almost insoluble in water and common solvents. It possesses high whiteness, high density, and radiation-blocking properties, making it a widely used functional filler in industrial applications.