A radioactive element discovered in 1952 in the debris from a nuclear detonation; Known isotopes include Fm-242 to Fm-259.[Merck Index] The 16 isotopes have short half-lives. The longest half-life is 100.5 days (Fm-257). [http://periodic.lanl.gov/elements/100.html]
Most Important Radionuclide: Fm-257
Source: Neutron bombardment of plutonium;
Half-Life: 100.5 days
Decay Mode: Alpha
Lung Clearance Half-Time: Weeks
Internal Toxicity: Very High
Annual Limit on Intake: 0.0002 mCi
[See Glossary for references.] See "Radiation, ionizing."
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