Which dosimeters are worn on the trunk within 15 cm of each other when performing radiation work or entering a radiation work area, and by pregnant workers entering zone 2, 3 or unzoned areas?

• A. OSL And Film Badge
• B. Ring Badge And EPD
• C. EPD And Film Badge
• D. TLD And EPD

Answer: (D)

The key idea is how dosimeters are arranged to monitor exposure for workers in radiation areas, with extra care for pregnant workers. Two dosimeters are worn on the trunk within about 15 cm of each other so they sample the same body region and can be cross-checked. The best match for this setup is a thermoluminescent dosimeter (TLD) and an electronic personal dosimeter (EPD). The TLD provides the integrated, long-term dose over a monitoring period, while the EPD gives real-time readings of dose rate and current dose. This combination on the same trunk area is especially useful for pregnant workers entering Zone 2, Zone 3, or unzoned areas because it ensures immediate awareness of any exposure risk (via the EPD) while preserving an accurate cumulative dose record (via the TLD).

Other options don’t fit the trunk-within-15-cm requirement as neatly. A ring badge is worn on the finger, not the trunk, so it doesn’t meet the placement rule. Other pairings mix devices (like film, OSL) that are less standard for paired trunk monitoring with immediate readout, whereas TLD plus EPD directly satisfies both the placement rule and the need for simultaneous real-time and cumulative dose information.