Final answer:
The quantity that reflects both dose and volume of irradiated tissue is the equivalent dose, measured in sievert (Sv). It is calculated by multiplying the absorbed dose in gray (Gy) by the radiation weighting factor (WR).
Step-by-step explanation:
The quantity that reflects both dose and volume of irradiated tissue is the equivalent dose. The equivalent dose is a measure of the health effects of ionizing radiation on the human body. It is calculated by multiplying the absorbed dose in gray (Gy) by the radiation weighting factor (WR). The unit for equivalent dose is the sievert (Sv).