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radium A

noun

, Chemistry.
  1. a substance, formed by decay of radon, that gives rise to radium B.


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Word History and Origins

Origin of radium A1

First recorded in 1900–05
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Example Sentences

Katie Hafner: He told Meitner that where he'd expected to see radium, a heavy metal, he was instead finding barium, a much lighter element.

She had radium - a radioactive substance - sewn into her cervix to try to kill off the tumour.

From BBC

Researchers have found high levels of radium, a radioactive element that increases the risk of different types of cancer, downstream of the facilities' outlets.

From Salon

It contained radium, a highly radioactive element, and the stuff was inescapable.

The active ingredient in these drinks was radium, a radioactive element that releases a packet of radiant energy with every atomic decay.

From Salon

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radiumradium B