The absorbed dose of radiation in SI unit is expressed as:

Correct option is C

The absorbed dose of radiation is the amount of energy deposited by ionizing radiation per unit mass of material, commonly human tissue. The SI unit for measuring absorbed dose is the Gray (Gy), where:
· 1 Gray (Gy) = 1 joule of energy deposited per kilogram of matter (J/kg).
Other units like the Rad (obsolete) were previously used, where:
· 1 Gray = 100 Rad.
Additional Knowledge: 1. Roentgen (Option 1):
· Measures exposure to ionizing radiation (X-rays or gamma rays) in air.
· It does not quantify energy absorbed by tissues.
2. Rad (Option 2):
· Non-SI unit for absorbed dose.
· 1 Rad = 0.01 Gray.
3. Gray (Option 3 - Correct Answer):
· SI unit for absorbed dose, widely used in medical and environmental contexts.
· Essential in radiology, cancer treatment, and radiation safety.
4. Becquerel (Option 4):
· SI unit for radioactivity.
· 1 Becquerel = 1 disintegration per second.