Which device is primarily used in the field of radiation protection to ensure that personnel are not exposed to harmful levels of radiation?

The personal dosimeter is specifically designed to monitor an individual's exposure to radiation over a period of time. It serves a critical function in radiation protection by providing a measurable record of the dose received by the wearer. This allows for assessments of whether the exposure levels are within safe limits and helps in ensuring compliance with occupational safety standards.

Personal dosimeters come in various forms, such as badges or wrist monitors, and can detect various types of radiation, including gamma rays, X-rays, and beta particles. They are essential for protecting workers in environments where radiation exposure is a risk, making it evident that their primary purpose is to safeguard personnel from harmful radiation levels.

While other devices mentioned, like the Geiger (GM) Counter and the survey meter, are useful for measuring radiation levels in the environment, they do not directly measure personal exposure. Radiation shields serve to block radiation from reaching individuals, but they don't provide exposure data. Thus, the personal dosimeter stands out as the primary tool for ensuring individual safety regarding radiation exposure.