Which of the following types of personnel radiation monitoring devices is most sensitive?

• A. Thermoluminescent dosimeter
• B. Film badge
• C. Optically stimulated luminescent dosimeter
• D. Personal exposure meter

Answer: (C)

The optically stimulated luminescent dosimeter (OSLD) is recognized as the most sensitive among the types of personnel radiation monitoring devices listed. This sensitivity is attributed to the advanced technology used in OSLDs, which involves storing energy from ionizing radiation in a luminescent material that can be read out using a laser. The precise nature of this method allows for the detection of lower doses of radiation, making OSLDs particularly effective for monitoring personnel who may be exposed to varying levels of radiation.

Additionally, OSLDs exhibit improved accuracy and a wide dynamic range, enabling them to measure radiation exposure over time without losing their sensitivity. They can retain and subsequently release the energy they absorb, leading to a reliable reading even after being stored for extended periods. Consequently, OSLDs are often preferred in environments where precise monitoring of radiation exposure is critical, such as in medical and research settings.

In contrast, other personnel monitoring devices, such as thermoluminescent dosimeters, film badges, and personal exposure meters, may not offer the same level of sensitivity or may be more suited to specific applications. For example, while thermoluminescent dosimeters are also sensitive, they may not match the operational flexibility and low detection limit of O