Advanced The emission of radiation, such as X-rays, from certain substances as a result of nuclear decay. Clear All
2 Example Sentences Showcasing the Meaning of 'Radioactivity'
The journalist wrote an article about the cleanup efforts following a nuclear accident and the potential long-term effects of radioactivity.
The geologist examined the rocks in the region, noting the presence of naturally occurring radioactivity as a factor in the landscape's formation.
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