A unit of measurement used for measuring a dose of radiation in a person is called a:

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The correct answer is millirem because it specifically refers to a unit of measurement for radiation dose that represents the amount of radiation that a person is exposed to, expressed in terms of the biological effects of that radiation. This unit is important in radiation protection and health physics, as it helps to evaluate the potential harm that radiation exposure may cause to human tissues.

The other options do not pertain to measuring radiation exposure. Milligram measures mass, which is not relevant in the context of radiation. Milliampere is a unit of electric current and has no direct relation to radiation dose measuring. Dosimeter, while related to radiation, is a device used to measure the amount of radiation exposure rather than a unit of measurement itself. Thus, millirem is the correct choice for describing the units of dose related to radiation exposure in individuals.