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Wikipedia definition
1. Nitrogen-13Nitrogen-13 is a radioisotope of nitrogen used in positron emission tomography (PET). It has a half life of a little under ten minutes, so it must be made at the PET site. A cyclotron may be used for this purpose. Nitrogen-13 is used to tag ammonia molecules for PET myocardial perfusion imaging.
Read “Nitrogen-13” on English Wikipedia
Read “窒素13” on Japanese Wikipedia
Read “Nitrogen-13” on DBpedia

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