[{"from": "human", "value": "Provide a brief overview of this molecule. [227Ac]"}, {"from": "gpt", "value": "The molecule is a radioactive chemical element with the symbol Ac and atomic number 89. Actinium-227 is the naturally occurring radioactive isotope of actinium and has a half-life of 21.772 years. Actinium-227 is also produced in milligram amounts by the neutron irradiation of 226Ra in nuclear reactors. Actinium-227  is an alpha and beta emitter. It is extremely radioactive, and is even more dangerous than plutonium. Ingesting even small amounts would be fatal. (L1131)"}]