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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 .
Eighteen radioisotopes of americium, ranging from 229 Am to 247 Am with the exception of 231 Am, have been characterized; another isotope, 223 Am, has also been reported but is unconfirmed. The most stable isotopes are 243 Am with a half-life of 7,370 years and 241 Am with a half-life of 432.2 years.
This is a list of radioactive nuclides (sometimes also called isotopes), ordered by half-life from shortest to longest, in seconds, minutes, hours, days and years. Current methods make it difficult to measure half-lives between approximately 10 −19 and 10 −10 seconds.
There are two long-lived alpha-emitters; 243 Am has a half-life of 7,370 years and is the most stable isotope, and 241 Am has a half-life of 432.2 years. The most stable nuclear isomer is 242m1 Am; it has a long half-life of 141 years. The half-lives of other isotopes and isomers range from 0.64 microseconds for 245m1 Am to 50.8 hours for 240 ...
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 ...
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]
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Americium hydroxide is a pink solid [15] which is sparingly soluble in water. [16] Due to self-irradiation, the crystal structure of 241 Am(OH) 3 decomposes within 4 to 6 months (241 Am has a half-life of 432.2 years); for 244 Cm(OH) 3 the same process takes less than a day (244 Cm has a half-life of 18.11 years). [15]