American Society of Radiologic Technologist (ASRT) Practice Exam

What type of radiation exposure monitoring device provides real-time reading?

1. Film badge

2. Thermoluminescent dosimeter badge

3. Optically stimulated luminescence badge

4. Pocket ion chamber

The correct answer is: Pocket ion chamber

The pocket ion chamber is a radiation exposure monitoring device that provides real-time readings of radiation exposure. This device contains a small ionization chamber that produces a measurable electrical current in response to ionizing radiation. As radiation passes through the chamber, it ionizes the gas inside, and the resulting current can be read immediately on a scale, allowing the user to see their exposure level at that moment. Unlike film badges, thermoluminescent dosimeter badges, and optically stimulated luminescence badges, which are designed to provide cumulative dose information over a period of time and require processing after exposure to reveal the dose, the pocket ion chamber's design allows for immediate feedback. This is particularly useful for health care professionals who need to monitor their exposure levels in real-time while working in environments with potential radiation hazards. Pocket ion chambers are compact and portable, making them ideal for personal monitoring in various settings. The other options may delay the assessment of exposure until they are processed, which is not useful for immediate monitoring needs.