Which type of personal radiation monitor utilizes a film-based detection method?

Which type of personal radiation monitor utilizes a film-based detection method?

• A. Pocket dosimeter
• B. Film badge
• C. Optically stimulated luminescence
• D. Thermoluminescent dosimeter

Answer: (B)

The film badge is a type of personal radiation monitor that utilizes a film-based detection method. This device consists of photographic film that is enclosed in a light-tight pack. When exposed to radiation, the film becomes fogged to varying degrees, depending on the amount of radiation encountered. After processing, the fogged areas indicate the radiation exposure level. Film badges are particularly useful for monitoring cumulative exposure over time and can provide both qualitative and quantitative data about radiation exposure through the analysis of the developed film.

In contrast, other options rely on different detection methods. The pocket dosimeter uses ionization to measure radiation and provides real-time readings. Optically stimulated luminescence dosimeters utilize aluminum oxide to capture electron energy and are read using a specific light stimulus, offering high sensitivity and low minimum detectable dose. Thermoluminescent dosimeters measure ionizing radiation by trapping electrons in a crystal structure, which are released as light when heated. Each method has its advantages, but the film badge stands out for its film-based approach to radiation detection.