The gray is a unit of absorbed dose defined as being equal to which of the following?

The gray (Gy) is indeed defined as a unit of absorbed dose in the International System of Units (SI), specifically representing the absorption of one joule of radiation energy per kilogram of matter. This is mathematically expressed as joules per kilogram. The gray measures the amount of energy deposited in a given mass from ionizing radiation, making it a direct and useful measure for understanding the effects of radiation exposure on biological tissues.

This metric is critical in the field of radiologic technology, as it allows practitioners to assess how much radiation energy is absorbed by the body, which is important for determining safety levels and potential health impacts from radiological procedures. The simplicity of the definition (one joule per kilogram) aids in straightforward calculations and applications in clinical settings.