Equivalent Dose is calculated as:

Equivalent Dose is calculated as:

• A. Coulombs/kilogram
• B. Joules/kilogram
• C. D x radiation weighting factor (Wr)
• D. D x Wr x Wt

Answer: (C)

Equivalent dose accounts for how harmful different types of radiation are by adjusting the energy actually deposited in tissue for the radiation’s biological effectiveness. The absorbed dose, D, is the energy deposited per unit mass and is measured in gray (Gy). The radiation weighting factor, Wr, reflects how biologically damaging the radiation type is. By multiplying absorbed dose by Wr, you convert the energy deposition into a measure of potential harm that accounts for radiation type, and the result is expressed in sieverts (Sv). For example, 2 Gy from alpha radiation with Wr about 20 yields roughly 40 Sv, illustrating why alpha radiation is far more biologically damaging per unit energy than X-rays (Wr ≈ 1). The other options either describe exposure in air (not the dose to tissue) or give only absorbed dose, or mix in tissue weighting factors used for a different metric (effective dose). Thus, the correct calculation is D × Wr.

Equivalent dose accounts for how harmful different types of radiation are by adjusting the energy actually deposited in tissue for the radiation’s biological effectiveness. The absorbed dose, D, is the energy deposited per unit mass and is measured in gray (Gy). The radiation weighting factor, Wr, reflects how biologically damaging the radiation type is. By multiplying absorbed dose by Wr, you convert the energy deposition into a measure of potential harm that accounts for radiation type, and the result is expressed in sieverts (Sv). For example, 2 Gy from alpha radiation with Wr about 20 yields roughly 40 Sv, illustrating why alpha radiation is far more biologically damaging per unit energy than X-rays (Wr ≈ 1). The other options either describe exposure in air (not the dose to tissue) or give only absorbed dose, or mix in tissue weighting factors used for a different metric (effective dose). Thus, the correct calculation is D × Wr.