Physical properties: atomic number 82, atomic weight 207.2. density 11.34g/cm3, melting point 327.5℃, boiling point 1740℃. Blue silvery-white heavy metal.
Chemical properties: Easily oxidized to gray-black lead oxide by oxygen in the air, which makes its silver-white luster gradually become dull and shiny. However, this layer of lead oxide forms a dense film that prevents the lead inside from being further oxidized.
High purity lead is mainly used in the preparation of compound semiconductors, cooling components, infrared photoelectric conversion devices, high efficiency temperature difference components and solder.
Lead is a non-radioactive element with a large atomic weight and has excellent radiation protection. When gamma rays enter a substance, the photoelectric effect, the Compton effect, generally occurs mainly. The possibility of both effects occurring is related to the atomic number of the blocking substance, the higher the atomic number, the greater the chance of the effect occurring.
Radiation is harmful to the human body, in medical care, the right amount of radiation is very necessary for medical examination means, but in order to protect the health of patients as well as medical personnel, in the radiation treatment area will take radiation protection doors and other means to block and weaken the radiation effect of radiation, radiation resistant lead plates are mainly used in medical imaging rooms, radiation treatment rooms, X-ray machine rooms, interventional treatment channels and other places.
High purity lead is also used in the field of spaceflight, where space radiation is one of the main risk factors threatening the health of astronauts during manned deep space flight. Due to the excellent radiation protection ability, high purity lead is used as the main radiation protection material for the cabin and space suits.