Which type of personnel monitoring device discharges a capacitor in the presence of ionizing radiation?

The correct type of personnel monitoring device that discharges a capacitor in the presence of ionizing radiation is the pocket chamber. This device functions by using a small ionization chamber that can measure exposure to ionizing radiation. When radiation interacts with the gas in the chamber, it ionizes the gas molecules, leading to a discharge of the capacitor. The discharge is then indicative of the amount of radiation exposure that has occurred.

Pocket chambers provide real-time readings, allowing personnel to quickly assess their exposure levels, which is critical in environments with varying radiation levels. This real-time feedback helps ensure that safety protocols are followed and that radiation exposure does not exceed recommended limits.

Other types of monitoring devices, such as film badges and thermoluminescent dosimeters (TLDs), utilize different mechanisms to measure exposure. Film badges rely on the development of photographic film, which records radiation exposure over time, while TLDs utilize materials that release stored energy as light when heated, reflecting the exposure level. Audible warning devices are not used for monitoring radiation exposure levels; they serve as alarms or notifications for safety purposes.