What is the international unit used to measure radiation in the same manner as the rad?

The Gray (Gy) is the correct unit of measurement when it comes to quantifying ionizing radiation absorbed by matter. Specifically, it is defined as the absorption of one joule of radiation energy by one kilogram of matter. This is analogous to the rad, which is an older unit used primarily in the context of measuring absorbed radiation dose and represents the absorption of 100 ergs of energy per gram of matter.

The Gray is part of the International System of Units (SI) and has largely replaced the rad in scientific and regulatory contexts due to its clarity and ease of use in modern applications. Understanding this relationship emphasizes the transition to more standardized units in radiation measurement, which align with international scientific consensus. Thus, the Gray serves as the modern equivalent to the rad, providing a contemporary framework for measuring radiation exposure in various environments.