A series of x-ray exposures result in a patient's skin absorbing 2.0 joules (J) of energy. The exposed area of the skin has a mass of 0.5 kilograms (kg). What is the absorbed dose to the skin?

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Multiple Choice

A series of x-ray exposures result in a patient's skin absorbing 2.0 joules (J) of energy. The exposed area of the skin has a mass of 0.5 kilograms (kg). What is the absorbed dose to the skin?

Explanation:
Absorbed dose is energy deposited per unit mass. Here, 2.0 joules of energy are absorbed by a mass of 0.5 kilograms, so the dose is 2.0 J divided by 0.5 kg = 4 J/kg. Since 1 gray equals 1 J/kg, the absorbed dose is 4 Gy. That value appears in the choice listing that shows 4 Gy. (There is another choice with the same 4 Gy, which would reflect the same dose as well.)

Absorbed dose is energy deposited per unit mass. Here, 2.0 joules of energy are absorbed by a mass of 0.5 kilograms, so the dose is 2.0 J divided by 0.5 kg = 4 J/kg. Since 1 gray equals 1 J/kg, the absorbed dose is 4 Gy. That value appears in the choice listing that shows 4 Gy. (There is another choice with the same 4 Gy, which would reflect the same dose as well.)

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