What is a gray (Gy) defined as?

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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

What is a gray (Gy) defined as?

Explanation:
The main idea is how absorbed dose is quantified. The gray is defined as the amount of energy deposited by ionizing radiation per unit mass of tissue. Specifically, 1 gray equals 1 joule of energy absorbed in 1 kilogram of matter. This is a mass-based unit, not a volume-based one, which is why the precise definition uses kilograms rather than liters. So 1 J per kilogram deposited in tissue is the correct description of a gray. The other options mix in joules per liter or use wrong energy-per-mass values (0.1 J/kg or 10 J/kg), which do not match the standard definition.

The main idea is how absorbed dose is quantified. The gray is defined as the amount of energy deposited by ionizing radiation per unit mass of tissue. Specifically, 1 gray equals 1 joule of energy absorbed in 1 kilogram of matter. This is a mass-based unit, not a volume-based one, which is why the precise definition uses kilograms rather than liters.

So 1 J per kilogram deposited in tissue is the correct description of a gray. The other options mix in joules per liter or use wrong energy-per-mass values (0.1 J/kg or 10 J/kg), which do not match the standard definition.

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