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exposure A quantity used to express external ionizing radiation, or to indicate presence of radionuclides or radiation affecting individuals or populations (for example, “exposure” to radionuclides in the environment). gray (Gy) The SI unit of absorbed dose. 1 Gy equals an absorbed dose of 1 J/kg (100 rad).
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It is #2 since you don't need to know who made this and when. #2 is the answer because the important part is knowing what his name is and what grade so they know who it belongs to if it gets lost