An advantage of Optically Stimulated Luminescent Dosimeter (OSL) monitoring badges over Thermoluminescent Dosimeters (TLD) monitoring badges is that:

• A. OSL badges fade from heat
• B. OSL badges can only be read once
• C. OSL badges are more sensitive to radiation
• D. OSL badges are less expensive

Answer: (C)

The main idea here is about sensitivity. Optically Stimulated Luminescent Dosimeter badges are more sensitive to radiation than Thermoluminescent Dosimeter badges, meaning they can detect and measure smaller amounts of ionizing radiation more reliably.

OSL badges store energy in a material when exposed to radiation, and later, a light stimulus releases that energy as luminescence. The emitted light is proportional to the absorbed dose, and the materials used in OSL detectors typically produce a stronger signal for the same dose than the crystals in TLDs. This higher signal-to-dose relationship allows accurate measurement at low dose levels, which is a key advantage for personnel monitoring.

Other statements aren’t advantages: heat can cause fading in some systems and is not a feature that makes OSL superior; some dosimeters can be read more than once, which would contradict an option claiming single-use only; and cost can vary, so being less expensive isn’t a universal benefit. The essential edge of OSL badges is their greater sensitivity to radiation.