[{"from": "human", "value": "Could you give me a brief overview of this molecule? [Am]"}, {"from": "gpt", "value": "The molecule is a synthetic element that has the symbol Am and atomic number 95. It is a radioactive metallic element of the actinide series. Eighteen radioisotopes of americium, with mass number from 231 to 249, have been characterized. The most stable isotopes are Am-243 (half-life of 7370 years) and Am-241 (half-life of 432.2 years). The most used isotope is Am-241 because it is easiest to produce. Americium is widely used in commercial ionization-chamber smoke detectors as well as in neutron sources and industrial gauges. Americium emits alpha and gamma radiation, which represents a serious health hazard. (L1103)"}]