The unit cGy measures which aspect of radiation in risk assessments?

The unit cGy measures which aspect of radiation in risk assessments?

• A. Dose rate of radiation
• B. Radiation energy
• C. Dose equivalent in rems
• D. Absorbed dose of radiation

Answer: (D)

The main idea here is that centiGray measures absorbed dose. Absorbed dose is the amount of radiation energy deposited in a mass of tissue, expressed in grays (Gy). Since centiGray is 1/100 of a gray, 1 cGy equals 0.01 Gy. This quantity specifically reflects energy delivered per unit mass, which is distinct from dose rate (how quickly the energy is delivered) and from dose equivalent (which adjusts the absorbed dose for biological effect using weighting factors and is expressed in rems or sieverts). Therefore, cGy directly represents the absorbed dose, making it the correct choice in risk assessments.

The main idea here is that centiGray measures absorbed dose. Absorbed dose is the amount of radiation energy deposited in a mass of tissue, expressed in grays (Gy). Since centiGray is 1/100 of a gray, 1 cGy equals 0.01 Gy. This quantity specifically reflects energy delivered per unit mass, which is distinct from dose rate (how quickly the energy is delivered) and from dose equivalent (which adjusts the absorbed dose for biological effect using weighting factors and is expressed in rems or sieverts). Therefore, cGy directly represents the absorbed dose, making it the correct choice in risk assessments.