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radioactivity
[ rey-dee-oh-ak-tiv-i-tee ]
noun
- the phenomenon, exhibited by and being a property of certain elements, of spontaneously emitting radiation resulting from changes in the nuclei of atoms of the element.
radioactivity
/ ˌreɪdɪəʊækˈtɪvɪtɪ /
noun
- the spontaneous emission of radiation from atomic nuclei. The radiation can consist of alpha, beta, and gamma radiation
radioactivity
/ rā′dē-ō-ăk-tĭv′ĭ-tē /
- The emission of radiation by unstable atomic nuclei undergoing radioactive decay .
radioactivity
- The emission of elementary particles by some atoms when their unstable nuclei disintegrate ( see half-life ). Materials composed of such atoms are radioactive. ( See alpha radiation , beta radiation , and gamma radiation .)
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Word History and Origins
Origin of radioactivity1
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A Closer Look
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Example Sentences
The researchers did not report any evidence of radioactivity within the quasicrystal itself, Conover says.
These fears were addressed instead by films that tickled the imagination, with giant insects transformed by radioactivity.
Although radioactivity was discovered in 1896, that energy long remained an untapped resource.
This would allow an estimate of the energy still left in the Martian core from a combination of its formation and radioactivity, a key element in understanding what geological activity might still be possible there.
“It is probably the purest environment in terms of radioactivity on Earth,” says Gioacchino Ranucci, a Borexino member.
Speculation: The scorch might have been made by radioactivity attendant upon the resurrection.
This new virus strain was accidentally produced in the course of some experiments with radioactivity.
Twenty minutes after the irradiation period, the radioactivity of the calcium standards is measured by the same instrument.
Later on, radioactivity from silver (silver-110m) can be measured using a longer counting time.
Since the atomic wars, the increased radioactivity of the earth undoubtedly stimulates mitosis of the malignant cells.
Traces of natural radioactivity can be found, in fact, in all substances on earth.
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