Radiation is measured in which unit?

Radiation is primarily measured in terms of exposure and dose, with millirems being a specific unit used for radiation dose measurement in relation to its biological effect. The millirem quantifies the amount of radiation absorbed by an organism and provides insight into the potential biological impact, making it essential for assessing radiation safety in various environments, particularly in healthcare and nuclear industries.

The other units mentioned serve different purposes: microrads also measure radiation exposure but are typically smaller in scale than millirems; decibels measure sound intensity, not radiation; and terawatts measure power output, which is not directly related to radiation exposure or dose. Thus, millirems stand out as the correct unit for expressing radiation dose with an emphasis on its biological ramifications.