CAMRT Radiography Practice Exam

Which of the following is NOT a personal radiation monitor?

1. Optically stimulated luminescence (OSL)

2. Ion storage device

3. Thermal neutron counter

4. Pocket dosimeter

The correct answer is: Thermal neutron counter

The chosen answer is appropriate because a thermal neutron counter is not classified as a personal radiation monitor. Personal radiation monitors are devices used by individuals to measure and record their exposure to ionizing radiation in real time or over a specific period. Optically Stimulated Luminescence (OSL) monitors and pocket dosimeters are examples of personal dosimetry tools that indicate exposure to gamma and X-ray radiation. OSL monitors work by storing energy from radiation in a crystal and releasing it as visible light, which can be measured to determine exposure levels. Pocket dosimeters provide immediate readouts of radiation level by using a small ionization chamber, making them essential for monitoring individual exposure during work with radiation. While the ion storage device is often considered a type of dosimeter used for more specific applications, it does not function as a personal monitor in the same context as the others. The thermal neutron counter, on the other hand, is designed to detect and measure neutron radiation specifically, and its application is typically in environmental or laboratory settings rather than for individual, personal exposure monitoring. Thus, it is the correct answer for this question.