Читать книгу Patty's Industrial Hygiene, Physical and Biological Agents - Группа авторов - Страница 57

The most common optically stimulated luminescence (OSL) crystal, Al₂O₃:C, will absorb energy from ionizing radiation, and when stimulated by visible light (typically a green laser), will emit blue light that is proportional to the radiation dose. Although similar to the operation of a TLD, the OSL crystals can be read repeatedly, since only a fraction of the trapped charges generated by ionizing radiation are needed to produce the light signal for reading. The OSL crystals are coated onto tissue equivalent plastic films in thin layers, so that they can be easily exposed to the light needed to cause luminescence. The reading and calibration is similar to that of a TLD, and it can measure doses under 1 mrem. Although the OSL dosimeter can be read multiple times, it is not normally “zeroed” and reutilized as are TLDs.