What is the SI unit of absorbed dose?

What is the SI unit of absorbed dose?

• A. Rad
• B. Rem
• C. Gray
• D. Sievert

Answer: (C)

Absorbed dose is a measure of how much energy from ionizing radiation is deposited in a mass per unit of mass. The SI unit for this is the Gray (Gy), defined as one joule of energy absorbed per kilogram of matter. This makes the Gray the standard unit for quantifying energy deposition, regardless of the type of tissue. Older units include the rad, where 1 rad equals 0.01 Gy. The other two units listed, rem and Sievert, are used for dose equivalent or effective dose, which account for the biological impact of radiation rather than just energy deposited. Specifically, 1 Sievert equals 100 rem, and these are not the units for absorbed dose.

Absorbed dose is a measure of how much energy from ionizing radiation is deposited in a mass per unit of mass. The SI unit for this is the Gray (Gy), defined as one joule of energy absorbed per kilogram of matter. This makes the Gray the standard unit for quantifying energy deposition, regardless of the type of tissue.

Older units include the rad, where 1 rad equals 0.01 Gy. The other two units listed, rem and Sievert, are used for dose equivalent or effective dose, which account for the biological impact of radiation rather than just energy deposited. Specifically, 1 Sievert equals 100 rem, and these are not the units for absorbed dose.