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Americium-241 (241 Am, Am-241) is an isotope of americium. Like all isotopes of americium, it is radioactive , with a half-life of 432.2 years . 241 Am is the most common isotope of americium as well as the most prevalent isotope of americium in nuclear waste .
Americium (95 Am) is an artificial element, and thus a standard atomic weight cannot be given. Like all artificial elements, it has no known stable isotopes.The first isotope to be synthesized was 241 Am in 1944.
The ground state of barium-137 is stable. The photon energy (energy of a single gamma ray) of 137m Ba is about 662 keV. ... Americium-241 is produced from 239
Americium is used in the most common type of household smoke detector, which uses 241 Am in the form of americium dioxide as its source of ionizing radiation. [101] This isotope is preferred over 226 Ra because it emits 5 times more alpha particles and relatively little harmful gamma radiation.
Of the 26 "monoisotopic" elements that have only a single stable isotope, all but one have an odd atomic number—the single exception being beryllium. In addition, no odd-numbered element has more than two stable isotopes, while every even-numbered element with stable isotopes, except for helium, beryllium, and carbon, has at least three.
Americium is stable in the +3 oxidation state, while the +4 oxidation state of plutonium can form in the human body. [20] The most common isotope americium-241 decays (half-life 432 years) to neptunium-237 which has a much longer half-life, so in the long term, the issues discussed above for neptunium apply. [21]
Most stable known isotope has half-life of 9.6 seconds. 111: Rg: Roentgenium (28.7) 0: Not traded. Only produced in experiments on a per-atom basis. [73] Most stable known isotope has half-life of 2.1 minutes. 112: Cn: Copernicium (14.0) 0: Not traded. Only tens of atoms have been produced in experiments. [72] Most stable known isotope has half ...
The most important isotopes of these elements in spent nuclear fuel are neptunium-237, americium-241, americium-243, curium-242 through -248, and californium-249 through -252. Plutonium and the minor actinides will be responsible for the bulk of the radiotoxicity and heat generation of spent nuclear fuel in the long term (300 to 20,000 years in ...