Associate Safety Professional Practice Exam

How can employee exposure to radiation be effectively controlled?

1. Only by using personal protective equipment

2. Through shielding, distance, and time reduction

3. By limiting the number of workers in the area

4. Through routine monitoring and reporting

The correct answer is: Through shielding, distance, and time reduction

Controlling employee exposure to radiation effectively requires a comprehensive understanding of the principles of radiation safety, particularly the concepts of shielding, distance, and time reduction, often referred to as the ALARA principle (As Low As Reasonably Achievable). Shielding involves using materials that can absorb or deflect radiation, ensuring that workers are not directly exposed to harmful doses. For example, lead, concrete, or water can serve as effective shields depending on the type of radiation. Distance plays a critical role as well; increasing the distance between the radiation source and the worker reduces exposure significantly due to the inverse square law of radiation. Essentially, doubling the distance from a radiation source can decrease exposure by a factor of four. Time reduction is another essential strategy; the less time spent near a radiation source, the lower the dose received. By minimizing the time spent in areas with potential radiation exposure, the risk to employees can be significantly lowered. While personal protective equipment and limiting the number of workers in the area can contribute to safety, they do not replace the foundational strategies of shielding, distance, and time, which directly influence the dose received. Routine monitoring and reporting are also vital for tracking exposure and ensuring safety protocols are followed, but they do not actively mitigate exposure in the