The radiation absorbed dose is primarily measured in which unit?

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

Answer: (B)

The radiation absorbed dose is primarily measured in the unit known as the Gray. The Gray is defined as the absorption of one joule of ionizing radiation by one kilogram of matter. This measurement quantitatively represents the amount of energy deposited by radiation in a material, which is crucial for assessing potential biological effects of radiation exposure.

The Gray specifically indicates the physical dose of radiation absorbed, independent of any biological effects. This is essential in radiography and radiation therapy for determining appropriate doses to ensure safety and effectiveness in medical imaging and treatment.

Other related units mentioned, such as the Rem and Sievert, are used to evaluate the biological effects of radiation on human tissue rather than the physical dose itself. Roentgen is a historical unit that measures exposure to X-rays and gamma rays but does not directly measure absorbed dose. Therefore, the Gray is the standard unit utilized for accurately measuring radiation absorbed dose in scientific and medical contexts.