Final answer:
The type of personnel monitoring device that discharges a capacitor when in the presence of ionization radiation is the 4. thermo-luminescent dosimeter (TLD).
Step-by-step explanation:
The type of personnel monitoring device that discharges a capacitor when in the presence of ionizing radiation is the thermo-luminescent dosimeter (TLD).
A TLD is a personal radiation monitor that detects and measures ionizing radiation by using a rechargeable internal capacitor. When exposed to ionizing radiation, the TLD absorbs energy and stores it in the form of trapped electrons. When the TLD is heated, the trapped electrons are released and emit light, which is then measured to determine the amount of ionizing radiation encountered.
Compared to other monitoring devices mentioned, such as pocket chambers, film badges, and audible warning devices, the TLD is more sensitive and reliable in measuring low levels of radiation exposure.