Which dosimeter would be least useful for frequent dose assessments?

• A. Thermoluminescent dosimeter
• B. Pocket ionization chamber
• C. Electronic dosimeter
• D. Film badge dosimeter

Answer: (D)

The film badge dosimeter is least useful for frequent dose assessments due to its inherent limitations in sensitivity and the time required for processing. Film badges contain photographic film that reacts to ionizing radiation; however, the readings are not immediate. They require development, much like traditional photographs, which can delay the dose assessment process.

In contrast, other dosimeters, such as pocket ionization chambers and electronic dosimeters, provide real-time or near-real-time readings, allowing for immediate feedback on radiation exposure. This is crucial in environments where frequent monitoring is necessary to ensure safety and compliance with exposure limits. Thermoluminescent dosimeters (TLDs) are also useful, as they can be read at regular intervals and offer a good level of sensitivity, but they still lack the immediacy that electronic dosimeters and pocket ionization chambers provide. Thus, for frequent dose assessments where quick results are essential, the film badge dosimeter is not the optimal choice.