What is the correct SI unit for measuring the absorbed dose of radiation in tissue?

The correct SI unit for measuring the absorbed dose of radiation in tissue is the Gray. One Gray is defined as the absorption of one joule of radiation energy by one kilogram of tissue. This unit is specifically designed to quantify how much energy from radiation is absorbed by biological tissues, which is crucial in fields such as medicine and radiation safety.

Understanding the absorbed dose is essential for assessing potential biological effects of radiation exposure. The Gray provides a standardized measure for this purpose, allowing for comparisons and effective monitoring of radiation doses received by patients during medical treatments or exposure in occupational settings.

The other units listed serve distinct purposes: the Sievert is used to measure the biological effect of radiation exposure by considering the type of radiation and its impact on health, rather than just the absorbed dose. The Becquerel measures radioactivity, or the rate of decay of radioactive material, and Joules measure energy in general, not specifically in the context of radiation absorption in biological tissues.