![]() Aside from francium, it has the lowest ionization potential of all the. Caesium (or cesium) is the chemical element with the atomic number 55 on the periodic table. Internal exposure to Cs-137 through ingestion or inhalation allows the radioactive material to be distributed in the soft tissues, especially muscle tissue, which increases cancer risk. Cesium is the most electropositive and most alkaline of the stable chemical elements. Large amounts of Cs-137 are not found in the environment under normal circumstances.Įxposure to Cs-137 can increase the risk for cancer because of the presence of high-energy gamma radiation. Total number of protons in the nucleus is called the atomic number of the atom and is given the symbol Z. ![]() Exposure to such a large amount could come from the mishandling of a strong industrial source of Cs-137, a nuclear detonation or a major nuclear accident. Caesium is a chemical element with atomic number 55 which means there are 55 protons in its nucleus. Other industrial devices that measure the thickness of materials such as paper or sheets of metal.Įxternal exposure to large amounts of Cs-137 can cause burns, acute radiation sickness and even death.About half as abundant as lead, it occurs in minute quantities as ores. It occurs naturally as the mineral greenockite and is used as a pigment and in semiconductors and fluorescent materials. The first element discovered by spectroscopy (1860), it is silvery white, liquid at warm room temperature (melting at 83 F 28.4 C), and very soft when solid. ![]() Industrial gauges that detect the flow of liquid through pipes. cesium, Chemical element, one of the alkali metal s, chemical symbol Cs, atomic number 55.Medical radiation therapy devices for treating cancer. Caesium is a soft, silvery-gold alkali metal with a melting point of 28.Cesium-137 is used in small amounts for calibration of radiation detection equipment, such as Geiger-Mueller counters.
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