Did you mayhaps mean radioactivity?
Definitions
Wiktionary
- n. physics The radioactive isotope of actinium, 22789Ac, having a half-life of 21.7 years
Etymologies
- From radio- + actinium (Wiktionary)
Examples
“Here he discovered radioactinium and conducted investigations with Rutherford on alpha-rays of radiothorium and radioactinium.”
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