Final answer:
The personnel monitoring device that provides immediate detection of radiation exposure is the audible warning device. Other devices like film badges, TLDs, and pocket ionization chambers measure exposure but do not provide instant alerts.
Step-by-step explanation:
Among the available personnel monitoring devices for detecting radiation, the type that can immediately detect any source of radiation exposure is the audible warning device. This device is capable of providing immediate feedback to the user when radiation is present. In contrast, a film badge, while used for personal radiation monitoring, only shows exposure after the film is developed and does not provide real-time detection. Thermoluminescent dosimeters (TLDs) and pocket ionization chambers also measure ionizing radiation exposure but do not provide instantaneous detection like an audible warning device.Film badges work by fogging up when exposed to radiation, with the amount of fogging proportional to the radiation level. However, these badges usually require later analysis to determine exposure levels and are not sensitive to low levels of radiation. More sensitive systems, such as TLDs, employ crystals that register the number of radioactive emissions over time and provide a more sensitive and reliable measure, yet they do not alert in real-time either.The pocket ionization chamber, while portable and capable of providing immediate readings, lacks an inherent alarm mechanism and thus does not alert the user without manual reading. Therefore, for the purpose of immediate radiation detection, the audible warning device is the best choice among the options provided.