Which quantity is used in SI to express exposure today?

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Multiple Choice

Which quantity is used in SI to express exposure today?

Explanation:
In the SI system, exposure today is quantified by air kerma. Air kerma measures the energy transferred from ionizing radiation to charged particles per unit mass of air, and its unit is the gray (Gy). This makes it a practical quantity for calibrating beams and relating beam output to dose in tissue, since it reflects the initial energy transfer in air where ionization occurs. The other terms describe different concepts: gray is absorbed dose (energy deposited in matter), roentgen is an old unit of exposure in air, and sievert is a dose equivalent that accounts for tissue weighting.

In the SI system, exposure today is quantified by air kerma. Air kerma measures the energy transferred from ionizing radiation to charged particles per unit mass of air, and its unit is the gray (Gy). This makes it a practical quantity for calibrating beams and relating beam output to dose in tissue, since it reflects the initial energy transfer in air where ionization occurs.

The other terms describe different concepts: gray is absorbed dose (energy deposited in matter), roentgen is an old unit of exposure in air, and sievert is a dose equivalent that accounts for tissue weighting.

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