Which type of personnel monitor is appropriate for use when monitors are changed at 3-month intervals?

The appropriate choice is TLD (Thermoluminescent Dosimeter) or OSL (Optically Stimulated Luminescence) because both of these types of dosimeters are designed for long-term monitoring of radiation exposure and can be effectively used in a monitoring program that includes changing monitors at 3-month intervals.

TLDs are known for their accuracy in measuring cumulative radiation dose over time, as they store energy from ionizing radiation and release it as light when heated. This makes them suitable for periodic evaluations and long-term monitoring circumstances. Moreover, OSLs work similarly by trapping energy in a material that can be stimulated with light to release the stored energy as luminescence, thus providing a dose measurement that can also be assessed after several months.

In contrast, pocket dosimeters give immediate readouts of radiation exposure, making them more suitable for real-time monitoring rather than for intervals of several months. They are primarily used for immediate assessments and less for comprehensive dose tracking over extended times. This is why they are not appropriate for a systematic monitoring approach at 3-month intervals, where accurate cumulative dose readings are essential.

By choosing TLD or OSL, personnel can ensure that they have reliable and accurate measurements over the specified monitoring period, aligning