Radiation Safety Practice Exam

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Study for the Radiation Safety Exam. Test your knowledge with multiple choice questions, each equipped with hints and explanations. Prepare effectively and confidently!

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What is the sub-unit of the roentgen that equals one-thousandth of a roentgen?

Microroentgen
Milliroentgen
Nanoroentgen
Picoroentgen

The correct answer is: Milliroentgen

The milliroentgen is the correct sub-unit of the roentgen that equals one-thousandth of a roentgen. The roentgen is a unit of measurement used to quantify exposure to ionizing radiation in air. When breaking down this measurement into smaller units, the milliroentgen is derived by dividing one roentgen by 1,000. This means that 1 milliroentgen (mR) is equal to 0.001 roentgen. The other units, while representative of smaller divisions of the roentgen, do not correspond to one-thousandth. The microroentgen is one-millionth, the nanoroentgen is one-billionth, and the picoroentgen is one-trillionth of a roentgen. Therefore, among the options provided, the milliroentgen is specifically defined and standardized to represent one-thousandth of a roentgen, making it the correct answer in this context.