TITLE

Actinium

PUB. DATE
January 2009
SOURCE
World Book Science Dataset;1/1/2009, p1
SOURCE TYPE
Encyclopedia
DOC. TYPE
Reference Entry
ABSTRACT
Actinium, a radioactive chemical element that occurs in nature in trace amounts as a result of the radioactive decay of uranium and thorium. Actinium, a heavy, silver-white metal, is usually prepared artificially by bombarding radium with neutrons in a nuclear reactor. It is the first element of the actinide series. The longest-lived isotope of actinium has a half-life period of about 22 years.
ACCESSION #
37310304

 

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