radioactive

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radio|ac|tive /r'eɪdioʊ'æktɪv/
[ADJ]
Something that is radioactive contains a substance that produces energy in the form of powerful and harmful rays.
The government has been storing radioactive waste at Fernald for 50 years.
● radioactivity [N-UNCOUNT]
...waste which is contaminated with low levels of radioactivity.

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