DANB Radiation Health and Safety (RHS) Practice Exam

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Prepare for the DANB Radiation Health and Safety Exam with quizzes including multiple-choice questions, hints, and explanations. Enhance your readiness today!

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What unit is used to measure ionization in the air?

Coulomb per kilogram
Gray
Sievert
Angstrom

The correct answer is: Coulomb per kilogram

The unit used to measure ionization in the air is the coulomb per kilogram. This unit quantifies the amount of electric charge produced per unit mass of air as a result of ionizing radiation. When ionizing radiation, such as X-rays or gamma rays, passes through air, it interacts with air molecules and produces ions. Measuring the ionization in terms of coulombs (the unit of electric charge) per kilogram of air provides a clear indication of the level of radiation exposure and allows for standardized comparisons across different environments or conditions. The other choices relate to different types of radiation measurements. The gray is a unit of absorbed dose, representing the amount of radiation energy absorbed per unit mass of material, while the sievert measures the biological effect of ionizing radiation, accounting for the type of radiation and its impact on human tissues. Angstrom is a unit of length, typically used in measuring wavelengths of light or distances on an atomic scale, and is not applicable in measuring ionization directly.