Which statement defines equivalent dose?

Which statement defines equivalent dose?

• A. Absorbed dose multiplied by the tissue's exposure factor.
• B. Sum of absorbed doses across tissues.
• C. Absorbed dose multiplied by the tissue's radiation weighting factor.
• D. The rate of air changes per hour in a room.

Answer: (C)

Biological harm from radiation depends on both how much energy is deposited and the type of radiation causing it. To compare different radiation types on a common scale, we adjust the absorbed dose by a radiation weighting factor that reflects how biologically damaging that type of radiation is. Multiplying the absorbed dose by this weighting factor gives the equivalent dose, which is expressed in sieverts and represents the potential harm from that radiation to the tissue. The idea is that a given amount of energy is not equally harmful in all forms of radiation; for example, high-LET radiations like alpha particles have a larger weighting factor than low-LET radiations like X-rays, so the same absorbed dose translates to a higher equivalent dose for alpha radiation. The other statements don’t capture this adjustment by radiation type: one isn’t based on an established factor for radiation type, another simply sums absorbed doses across tissues without the radiation-type weighting, and the last describes ventilation, not radiation dose.

Biological harm from radiation depends on both how much energy is deposited and the type of radiation causing it. To compare different radiation types on a common scale, we adjust the absorbed dose by a radiation weighting factor that reflects how biologically damaging that type of radiation is. Multiplying the absorbed dose by this weighting factor gives the equivalent dose, which is expressed in sieverts and represents the potential harm from that radiation to the tissue. The idea is that a given amount of energy is not equally harmful in all forms of radiation; for example, high-LET radiations like alpha particles have a larger weighting factor than low-LET radiations like X-rays, so the same absorbed dose translates to a higher equivalent dose for alpha radiation. The other statements don’t capture this adjustment by radiation type: one isn’t based on an established factor for radiation type, another simply sums absorbed doses across tissues without the radiation-type weighting, and the last describes ventilation, not radiation dose.