.Carbon 11 C decays by positron emission with a half-life of 20 min. Nitrogen 13 N decays by positron emission with a half-life of 9.97 min. Oxygen 15 O decays by positron emission with a half-life of 122 sec. Of the 3 tracers listed, which would would the the BEST option to track the circulatory system (Blood Flow) over a 2 hour period and why?
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oxygen is best option to flow the blood
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