Which dose concept measures energy stored in tissue exposed to ionising radiation and is measured in Grays (Gy)?

Which dose concept measures energy stored in tissue exposed to ionising radiation and is measured in Grays (Gy)?

• A. Equivalent dose
• B. Dose-area product
• C. Absorbed dose
• D. Effective dose

Answer: (C)

Absorbed dose is the quantity that directly measures the energy deposited in tissue per unit mass from ionising radiation. It tells you how much energy the tissue has stored, and it is measured in Grays, where 1 Gy equals 1 joule of energy deposited per kilogram of tissue. This makes it the best fit for the question, since the focus is on energy stored in tissue rather than biological effect or exposure indicators. Equivalent dose, while related to radiation exposure, accounts for the different biological effects of various radiation types and is expressed in sieverts. Dose-area product combines dose with the irradiated area and serves as a facility exposure indicator, not a measure of energy per mass. Effective dose goes further by weighting absorbed doses across tissues to estimate overall risk, also in sieverts. For a direct measure of energy deposited per kilogram, absorbed dose in grays is the correct concept. For example, depositing 2 joules into 1 kilogram yields an absorbed dose of 2 Gy.

Absorbed dose is the quantity that directly measures the energy deposited in tissue per unit mass from ionising radiation. It tells you how much energy the tissue has stored, and it is measured in Grays, where 1 Gy equals 1 joule of energy deposited per kilogram of tissue. This makes it the best fit for the question, since the focus is on energy stored in tissue rather than biological effect or exposure indicators.

Equivalent dose, while related to radiation exposure, accounts for the different biological effects of various radiation types and is expressed in sieverts. Dose-area product combines dose with the irradiated area and serves as a facility exposure indicator, not a measure of energy per mass. Effective dose goes further by weighting absorbed doses across tissues to estimate overall risk, also in sieverts. For a direct measure of energy deposited per kilogram, absorbed dose in grays is the correct concept. For example, depositing 2 joules into 1 kilogram yields an absorbed dose of 2 Gy.