The atomic number of the element cesium (Cs) is 55, which is in the sixth period, group IA. The cesium element is a light golden active metal with a low melting point and is easily oxidized in the air. It can react violently with water to form hydrogen and explode. Cesium has no elemental form in nature, and is only rarely distributed in land and ocean in the form of salt. Cesium is an important material in the manufacture of vacuum devices, photoelectric tubes, etc. Cesium metal is not radioactive. Therefore, cesium tungsten bronze is not a radioactive substance, and it is not harmful to the human body when used in glass and film.
Cesium tungsten bronze has excellent absorption properties for infrared rays and ultraviolet rays, and is widely used in near-infrared shielding materials, as well as thermal insulation coating materials for automotive glass, architectural glass, and agricultural greenhouse films. Many uninformed people think that cesium metal may be radioactive, which is actually a misunderstanding.
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