Radiology Tech Physics Practice Test

Which statement about effective dose is true?

It sums tissue-weighted doses across all tissues to estimate stochastic risk It equals the absorbed dose in the most irradiated tissue It measures dose to the skin only It is measured in Gy

Correct Answer:

It sums tissue-weighted doses across all tissues to estimate stochastic risk

Explanation:

Effective dose is a single value that estimates overall stochastic risk by combining how much radiation different tissues receive with how sensitive each tissue is to radiation-induced effects. For X-ray imaging, each tissue’s dose is weighted by a tissue weighting factor that reflects its contribution to cancer and hereditary risk, and then those weighted doses are summed across all tissues. This is why the statement describing summing tissue-weighted doses across the whole body to estimate stochastic risk is the correct one. It’s not the absorbed dose in the most irradiated tissue, nor just the dose to the skin, and the effective dose is expressed in sieverts (not grays), reflecting its basis in risk rather than a single tissue’s energy deposition.

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