What is the active ingredient found in optically stimulated luminescence dosimeters?

• A. Calcium sulfate
• B. Aluminum oxide (Al2O3)
• C. Silicon dioxide
• D. Lead oxide

Answer: (B)

Optically stimulated luminescence (OSL) dosimeters utilize aluminum oxide (Al2O3) as their active ingredient due to its favorable properties for radiation detection. When the aluminum oxide is exposed to ionizing radiation, it absorbs energy and becomes luminescent. This means that when stimulated by light, it releases the stored energy in the form of a visible light signal. The intensity of this light is proportional to the amount of radiation the dosimeter was exposed to, allowing for precise dose measurement.

Aluminum oxide is preferred for its sensitivity, wide dynamic range, and the ability to be reused multiple times, as it can be reset by exposure to bright light. These attributes make aluminum oxide an excellent choice for monitoring radiation exposure in various environments, including medical facilities and occupational settings.