[{"from": "human", "value": "Describe this molecule. [137Cs]"}, {"from": "gpt", "value": "The molecule is the chemical element with the symbol Cs and atomic number 55. Cesium-137 is a radioactive isotope of cesium with a half-life of 30.07 years. It is produced from the detonation of nuclear weapons and is produced in nuclear power plants. Cesium-137 was released to the atmosphere most notably from the 1986 Chernobyl meltdown. It is commonly used as a gamma-emitter in industrial applications such as moisture and density gauges, leveling gauges, flow meters, and other sensor equipment. Cesium-137 is water-soluble and extremely toxic in minute amounts. (L1111, L1124)"}]