Definitions
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun physics A
radioactive isotope of nitrogen, 137N, having sevenprotons and sixneutrons , and ahalf-life of less than ten minutes; it is used inpositron emission tomography
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Examples
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The pair's plan for identifying this altered temperature distribution relies on detecting neutrinos that are generated by a number of different fusion reactions within the Sun. The crucial point is that different reactions take place at different distances from the centre of the Sun - the reaction producing boron-8, for example, takes place at just 4% of the solar radius whereas that involving the production of nitrogen-13 occurs at 16% of the solar radius.
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