title: The influence of radioactive decay on actinide magnetic susceptibility measurements obtained using the Evans method.
abstract: In order to explain the higher magnetic susceptibility of some aquo actinide ions than predicted by Hund's rules, the molar magnetic susceptibilities of two americium isotopes ((241)Am and (243)Am) were measured using the Evans method. The results obtained show a growing change in the magnetic susceptibility with α and also a β(-) activity increase in solution. β(-) particle effects appear to be stronger than radicals formed by α particles on the experimental values. The temperature dependence of Am(iii) magnetic susceptibility has been observed but from experiments carried out here, it appears to be difficult to prove whether this effect arises from radicals or β(-). Finally, magnetic susceptibilities of americium recorded in different media (HClO4, HCl, and HNO3) have been compared to alpha and beta emissions' impact.
authors.affiliation: CEA, Nuclear Energy Division, Radio Chemistry & Processes Department, DRCP, BP 17171, F-30207 Bagnols sur Cèze, France. claude.berthon@cea.fr.
authors.forename: Matthieu
authors.initials: M
authors.lastname: Autillo
authors.forename: Peter
authors.initials: P
authors.lastname: Kaden
authors.forename: Andreas
authors.initials: A
authors.lastname: Geist
authors.forename: Laetitia
authors.initials: L
authors.lastname: Guerin
authors.forename: Philippe
authors.initials: P
authors.lastname: Moisy
authors.forename: Claude
authors.initials: C
authors.lastname: Berthon