Which unit measures the dose of radiation absorbed by human tissue?

Which unit measures the dose of radiation absorbed by human tissue?

• A. Roentgen (R)
• B. Gray (Gy)
• C. Sievert (Sv)
• D. Rad (rd)

Answer: (B)

The Gray (Gy) is the unit that measures the dose of radiation absorbed by human tissue. It quantifies the amount of radiation energy absorbed per kilogram of tissue, which is crucial for understanding the potential biological effects of radiation exposure. When evaluating exposure levels, the Gray is used primarily in the context of measuring absorbed doses and assessing how much energy has been deposited in tissues, which corresponds to the risk of biological effects such as radiation sickness or increased cancer risk. In contrast, the other units serve different purposes in radiation measurement. The Roentgen (R) measures exposure to X-rays and gamma rays in air but does not account for how that energy is absorbed by tissue. The Sievert (Sv) is another important unit that considers biological effects of radiation by incorporating quality factors; it is used to assess the health impact of radiation exposure but does not measure absorbed dose directly. The Rad, like the Gray, measures absorbed dose but is now largely replaced by the Gray in terms of standardization in measurements. Therefore, the Gray remains the most relevant unit for measuring how much radiation has been absorbed by human tissue.

The Gray (Gy) is the unit that measures the dose of radiation absorbed by human tissue. It quantifies the amount of radiation energy absorbed per kilogram of tissue, which is crucial for understanding the potential biological effects of radiation exposure. When evaluating exposure levels, the Gray is used primarily in the context of measuring absorbed doses and assessing how much energy has been deposited in tissues, which corresponds to the risk of biological effects such as radiation sickness or increased cancer risk.

In contrast, the other units serve different purposes in radiation measurement. The Roentgen (R) measures exposure to X-rays and gamma rays in air but does not account for how that energy is absorbed by tissue. The Sievert (Sv) is another important unit that considers biological effects of radiation by incorporating quality factors; it is used to assess the health impact of radiation exposure but does not measure absorbed dose directly. The Rad, like the Gray, measures absorbed dose but is now largely replaced by the Gray in terms of standardization in measurements. Therefore, the Gray remains the most relevant unit for measuring how much radiation has been absorbed by human tissue.