High Quality Content by WIKIPEDIA articles! Sodium-24 is one of the more important isotopes of sodium. It is radioactive and created from common sodium-23 by neutron bombardment. With a 15 hour half life, 24Na decays to 24Mg by emission of an electron and two gamma rays. Exposure of the human body to intense neutron flux creates 24Na in blood plasma. Measurements of its quantity are used to determine the absorbed radiation dose of the patient. This is used to determine the level of medical treatment required. When the sodium potassium alloy NaK is used as a coolant in nuclear reactors, 24Na is created which makes the coolant radioactive. When the 24Na decays, it causes a buildup of magnesium in the coolant. Since the half life is short, the 24Na portion of the coolant ceases to be radioactive within a few days after removal from the reactor.

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