This knowledge helped set the stage for the creation of a whole series of elements, including americium, curium, berkelium, californium, einsteinium, fermium, mendelevium, nobelium, and element 106, which was officially named "seaborgium" in August 1997.
For example, the analysis of the debris at the testing site of the first U.S. hydrogen bomb, Ivy Mike, (1 November 1952, Enewetak Atoll), revealed high concentrations of various actinides including americium; due to military secrecy, this result was published only in 1956.
All isotopes of americium are radioactive; the stablest isotope, americium-243, has proved more convenient for chemical investigations because of its longer half-life (7,370 years, compared with 433 years for americium-241).
(This amount of americium is too small to cause harm to the home's occupants).
Compounds of americium and californium with an oxidation state of +2 are known.
The distribution of americium in the plant was thoroughly examined.
The activity coefficient of americium in liquid aluminium has been determined by electrochemical methods.
More tests confirmed that two radioactive particles, isotopes of americium and plutonium, were found on aboveground air filters.
Open image in new window Figure 5 Accumulations of americium salts in the cell vacuole at increased level of the radionuclide impact.
The device consists of a thin wafer of Americium, attached to the forward surface of a test plane's wing, and a mounted aluminium electrode just above it.
