a chemical element that is a silver-white metal. It is radioactive and is used to make smoke detectors (= devices that make a loud noise when smoke is present)
tiny quantities of americium极少量的镅
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Two new drugs have been approved to treat radiation contamination due to plutonium, americium, or curium.
Officials insist that the low levels of plutonium, americium and other man-made radioactive contaminants present in the groundwater pose no public health threat.