During a fluoroscopy quality meeting, the physicist presents entrance skin dose, occupational exposure in air, and whole-body stochastic risk for a prolonged gastrointestinal case. Residents confuse gray, coulomb per kilogram, and sievert. Which SI unit assignment correctly distinguishes air kerma, exposure, and effective dose for this fluoroscopy review?
Select an answer to reveal the explanation.
Short Explanation
You sort this dose alphabet soup by matching what was measured to where it acts. Air kerma tracks energy in air, exposure tracks charge in air, and effective dose weights risk to you, so weighting makes sievert the risk unit.
Full Explanation
Air kerma quantifies kinetic energy released per unit mass of air and is expressed in gray, exposure quantifies ionization charge liberated per unit mass of air and is expressed in coulomb per kilogram, and effective dose applies tissue and radiation weighting factors to reflect stochastic risk to the whole body and is expressed in sievert, consistent with NCRP 184 usage that separates physical absorbed quantities from risk-related quantities. The sievert-for-kerma with gray-for-exposure assignment fails by concept because it reverses absorbed-energy and ionization quantities and misapplies weighting to a physical air measurement. The coulomb-per-kilogram-for-kerma with sievert-for-exposure assignment fails by concept because it assigns charge to energy and risk weighting to unweighted air ionization. The gray-kerma with sievert-exposure assignment fails by concept because exposure in air carries no tissue weighting and effective dose cannot be expressed as charge per mass. For the exam, remember gray for absorbed dose and kerma, coulomb per kilogram only for exposure in air, and sievert only after weighting for equivalent and effective dose, then practically check the dose report headers before quoting numbers to physicians.