americium241s
Americium-241, and by extension any informal plural form such as americium241s, is not a standard designation in nuclear chemistry. The term is sometimes used to refer to samples or sealed sources of americium-241 (Am-241), a radioactive isotope of the element americium. Am-241 has atomic number 95 and a nominal mass of 241.
Physical properties: Am-241 has a half-life of 432.2 years and decays by alpha emission to neptunium-237. Each
Production and occurrence: Am-241 is produced in nuclear reactors, primarily as a decay product of plutonium-241,
Applications: The most widespread use is in small sealed sources for ionization-type smoke detectors, typically providing
Safety and regulation: Am-241 is hazardous if ingested or inhaled; external exposure is mitigated by shielding.