Historically, exposure was measured in which unit?

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Study for the Health Physics (PMT 102A) Test. Access multiple-choice questions, explanatory hints, and detailed answers. Enhance your preparation confidently and get ready for the exam!

Multiple Choice

Historically, exposure was measured in which unit?

Explanation:
Exposure is about the ionization produced by radiation in air. Historically, that ionization was quantified using the Roentgen, an exposure unit that measures how much charge is generated in a kilogram of air by X‑ or gamma radiation. It’s different from modern measures like the Gray, which quantifies energy deposited in matter, or the Sievert, which weighs that energy for biological effect. The Becquerel, by contrast, tracks activity—the rate of radioactive decay—not exposure.

Exposure is about the ionization produced by radiation in air. Historically, that ionization was quantified using the Roentgen, an exposure unit that measures how much charge is generated in a kilogram of air by X‑ or gamma radiation. It’s different from modern measures like the Gray, which quantifies energy deposited in matter, or the Sievert, which weighs that energy for biological effect. The Becquerel, by contrast, tracks activity—the rate of radioactive decay—not exposure.

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