What device is used to check levels of radiation exposure?

The dosimeter is specifically designed to measure and record the amount of radiation exposure an individual receives over time. It works by absorbing radiation and providing a quantifiable measure of exposure, making it essential for personnel who work in environments where they are at risk of ionizing radiation. The data collected by a dosimeter helps ensure that radiation exposure stays within safe limits and allows for necessary safety measures to be taken if exposure is too high.

Other devices listed, while related to radiation in some contexts, do not serve the same purpose. For instance, a radiation meter is typically used to read radiation levels in the environment rather than personal exposure. A thermometer measures temperature, which isn't relevant to radiation exposure. A radiation gauge is usually employed in industrial applications to measure the thickness or density of materials rather than tracking individual exposure to radiation.