What type of relationship is shared between the light released by an Optically Stimulable Luminescent Dosimeter (OSL) and the dose recorded?

• A. Inversely proportional
• B. Directly proportional to the square
• C. Directly proportional
• D. Inversely proportional to the square

Answer: (C)

The light released by an Optically Stimulable Luminescent Dosimeter tracks the absorbed dose in a direct, linear way within the device’s useful range. When the dosimeter is irradiated, electrons get trapped in the luminescent material. Later, when stimulated with light, those traps release the electrons and produce photons. The number of trapped charges is proportional to the dose, and the emitted light is proportional to the released charges, so the luminescent signal increases directly with the dose. If you double the dose, you expect about double the light output, assuming calibration and the linear operating range. Inverse or squared relationships would imply opposite or non-linear behavior, which isn’t how OSL readouts behave in standard practice (though very high doses can push the response toward nonlinearity due to trap saturation).