Radiation Safety Practice Exam

The Roentgen (R) is equivalent to how many coulombs per kilogram of air?

1. 1.26 x 10-4

2. 2.58 x 10-4

3. 3.14 x 10-3

4. 4.58 x 10-5

The correct answer is: 2.58 x 10-4

The Roentgen (R) is a unit that measures exposure to ionizing radiation in air and is defined as the amount of x or gamma radiation that produces a specific amount of ionization in air. Specifically, one Roentgen is equivalent to 2.58 x 10^-4 coulombs per kilogram of air. This conversion is crucial for relating radiological measurements to practical applications, such as in radiation safety and health physics. Understanding this unit is important because it provides a means to quantify exposure and assess associated risks. The Roentgen is used primarily in medical contexts, such as radiology, to measure the amount of radiation that patients might receive during diagnostic imaging. The significance of the conversion factor highlights how ionizing radiation interacts with matter, particularly air, and the subsequent ionization created as a result of radiation exposure. This knowledge is vital for professionals in the field to ensure safety protocols are properly implemented and to understand the potential impacts of ionizing radiation on human health.