Actinium

Actinium, Ac, is a radioactive transition metal element, found in Group IIIa of the periodic table. It is the first member of the actinide series of inner transition elements.

It has three Isotopes

nuclide                        :      225Ac                    227Ac                    228Ac         

atomic mass              :                                   227.03

natural abundance    :       0%                       trace                    trace

half-life                       :     10 days                21.6 yrs                6.13 h

Actinium 227, which has a half-life of 22 years, is formed by the irradiation of Radium.


Discovery

Actinium, Ac, was discovered by Andre Debierne in 1899 AD.

Occurrence

Actinium occurs in association with Uranium ores, as a decay product of Uranium-235.

Uses

Actinium is used as a source of Neutrons.


Start of Hypertext .... Elements .... Compounds .... Index
Hypertext Copyright (c) 2000 Donal O'Leary. All Rights Reserved.