Question:
Which of the following best estimates the amount of radiation delivered to an organ in the radiation field?
Which of the following best estimates the amount of radiation delivered to an organ in the radiation field?
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Energy deposited per kilogram of that tissue, measured in gray.
Updated On: Jun 24, 2026
- Absorbed dose
- Equivalent dose
- Effective dose
- Exposure dose
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The Correct Option is A
Solution and Explanation
Step 1: The question asks what best measures how much radiation energy is actually delivered to an organ in the beam.
Step 2: Absorbed dose is the energy deposited per unit mass of tissue, measured in gray (Gy), where \(1\ \text{Gy} = 1\ \text{J/kg}\). It directly tells you how much radiation that organ received. So option A is correct.
Step 3: Why the others are wrong. Equivalent dose is absorbed dose multiplied by a radiation weighting factor, in sieverts, to reflect biological effect of different radiation types. Effective dose adds a tissue weighting factor and sums over the whole body to estimate overall stochastic risk, not the dose to one organ. Exposure dose measures ionisation in air, not energy delivered to the organ.
Step 4: So for energy delivered to a specific organ in the field, absorbed dose is the best estimate.
Answer: Absorbed dose.
Step 2: Absorbed dose is the energy deposited per unit mass of tissue, measured in gray (Gy), where \(1\ \text{Gy} = 1\ \text{J/kg}\). It directly tells you how much radiation that organ received. So option A is correct.
Step 3: Why the others are wrong. Equivalent dose is absorbed dose multiplied by a radiation weighting factor, in sieverts, to reflect biological effect of different radiation types. Effective dose adds a tissue weighting factor and sums over the whole body to estimate overall stochastic risk, not the dose to one organ. Exposure dose measures ionisation in air, not energy delivered to the organ.
Step 4: So for energy delivered to a specific organ in the field, absorbed dose is the best estimate.
Answer: Absorbed dose.
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