Which radiation monitoring device indicates the intensity of radiation through sound frequency or pitch?

The correct answer highlights the function of an audible warning device, which is designed to provide alerts through sound frequency or pitch in response to radiation exposure. This device senses the intensity of radiation and emits a sound that varies in frequency or loudness depending on the level of radiation detected. It serves as an immediate and intuitive warning system, allowing operators to make informed decisions about their safety in environments where radiation is present.

In contrast, the other options serve different purposes in radiation monitoring. A pocket chamber is a type of dosimeter that provides a direct reading through a movable scale or a visual indicator but does not use sound to signify radiation levels. A thermoluminescent dosimeter (TLD) uses materials that store energy from ionizing radiation; this energy is released as light when heated, which is then measured to assess exposure but does not produce sound cues. Meanwhile, a film badge utilizes photographic film to measure exposure over time, relying on the development of latent images rather than auditory signals to indicate radiation intensity.