What is the measurement unit for absorbed dose in radiation?

• A. Gray (Gy)
• B. Sievert (Sv)
• C. Rem
• D. Unit of general energy

Answer: (A)

The measurement unit for absorbed dose in radiation is the Gray (Gy). This unit quantifies the amount of radiation energy absorbed per unit mass of tissue. Specifically, one Gray is defined as the absorption of one joule of radiation energy by one kilogram of matter.

This measurement is crucial in medical imaging and radiation therapy, as it helps practitioners understand how much radiation a patient’s tissue is absorbing, which is essential for effective and safe treatment planning and for assessing potential biological effects.

Other units, like the Sievert (Sv), are related to biological effects of radiation and are utilized to measure the biological impact of radiation on human tissue, taking into account factors like the type of radiation. The Rem is a traditional unit correlated to the Sievert for measuring equivalent dose, also incorporating biological effects. The "unit of general energy" does not specifically relate to absorbed dose in the context of radiation measurement. Thus, the Gray (Gy) is the appropriate and standard unit used in practice for absorbed radiation dose.