(So named (America + -ium) by Glenn T. Seaborg, one of its discovers, by analogy with europium, the corresponding rare-earth metal) A radioactive, metallic chemical element, one of the actinides, produced by the beta decay of an isotope of plutonium. It is used in smoke detectors.
A neutron source for non-destructive testing of machinery and equipment
A thickness gauge for the glass industry
An ionisation source for smoke detectors (its most common use)
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