Which device can be worn on the body to measure accumulated radiation dose?

A device that can be worn on the body to measure accumulated radiation dose is the ionization dosimeter. This type of dosimeter operates based on the principle of ionization of gas, where radiation passing through the gas ionizes the atoms, resulting in measurable electrical charges. The amount of accumulated charge is proportional to the radiation dose received, allowing for a quantifiable measurement of exposure over time.

While film badges and digital dosimeters also serve to measure radiation exposure, they operate on different principles. Film badges use photographic film that darkens in response to radiation, and although they can reliably measure dose, they do not provide real-time data. Digital dosimeters typically provide immediate readings of radiation levels and can track exposure over time, but they function using semiconductor technologies rather than ionization principles.

The Geiger-Muller counter, on the other hand, is a handheld instrument used for detecting and measuring ionizing radiation, but it is not worn on the body and is not designed to measure accumulated dose over extended periods. Instead, it provides instantaneous readings of radiation intensity in the environment. Thus, the ionization dosimeter is the most suitable choice for measuring accumulated radiation dose when worn on the body.