Americium

silvery metal with two forms; α-Am: hexagonal, a=0.3468 nm, c=1.1241 nm; β-Am: cub, a=0.4894 nm; t1/2 241Am=433 years, t1/2242Am=152 h, t1/2 243Am=7400 years; Am+++ stable in aqueous solution; enthalpy of vaporization 230 kJ/mol; enthalpy of fusion 14.4 kJ/mol; enthalpy of sublimation 276 kJ/mol; ionic radius of Am+++ is 0.0982nm; can be prepared from 241Pu; used to diagnose thyroid disorders [KIR78] [CIC73] AMERICIUM, Chemical element, symbol Am, at no. 95, at. wt. 243 (mass number of the most

Gamma radiography, radiochemical research, diagnostic aid, electronic devices. Americium-141, with a half-life of 432 years, which produces both alpha (helium nuclei)and gamma rays (somewhat like X-rays), has found some commercial uses. One use is as thedetector used in household smoke alarms The americium-141 isotope emits alpha particlesthat ionize air by removing electrons from the molecules of air and improving its electricalconductivity. Smoke reduces this conductivity, thus triggering the alarm. Another use is americium-241’s high-energy gamma rays in radiography, in which portable X-ray instruments caneasily be transported for emergency use. As a gamma ray source, americium-241 is used as adiagnostic aid to check the quality of welds in metals.

Molecular Weight:243.061380
Exact Mass:243.06138
Monoisotopic Mass:243.06138
Heavy Atom Count:1
Covalently-Bonded Unit Count:1
Compound Is Canonicalized:Yes