SI unit of dose of radiation absorption –
**Core Concept**
The question is testing the understanding of the SI unit of dose of radiation absorption, which is an essential concept in medical physics and radiation safety. The correct unit is used to quantify the amount of radiation energy absorbed by a material or tissue.
**Why the Correct Answer is Right**
The correct unit of dose of radiation absorption is the Gray (Gy), which is defined as the absorption of one joule of radiation energy per kilogram of matter. This unit is widely used in medical and industrial applications to measure the amount of radiation absorbed by patients, workers, or materials. The Gray is a fundamental unit in the International System of Units (SI) and is used to express the dose of radiation from various sources, including ionizing radiation, such as X-rays, gamma rays, and alpha particles.
**Why Each Wrong Option is Incorrect**
**Option A:** The Becquerel (Bq) is the SI unit of radioactivity, which measures the rate of decay of radioactive materials, not the dose of radiation absorption.
**Option B:** The Sievert (Sv) is a unit of dose equivalent, which takes into account the biological effects of radiation, not just the absorbed dose. While related, it is not the correct unit for dose of radiation absorption.
**Option C:** The Curie (Ci) is a unit of radioactivity, similar to the Becquerel, and is not used to express the dose of radiation absorption.
**Clinical Pearl / High-Yield Fact**
Remember that the Gray (Gy) is the SI unit of dose of radiation absorption, whereas the Sievert (Sv) is used to express the dose equivalent, which is a more comprehensive measure of radiation risk.
**Correct Answer: C. Gray (Gy)**