Measurement of Extremely Large Dose with OSL (Optically Stimulated Luminescence) Personal Dosemeters

Kobayashi Ikuo, Suzuki Akifumi, Komori Hironobu, Morishima Hiroshige

doi:10.11269/jjrsm2001.1.17

A personal dosimetry system by Optically Stimulated Luminescence (OSL) was developed and widely commercialized. In normal uses, the upper limit of this measurement is reported to be 10 Sv for¹³⁷Cs gamma rays. Above this upper limit, the counting system saturates to go beyond its measuring capability.<BR>However, far larger radiation doses are applied to transfusion blood. A simple and reliable dosimetry system is required for this extremely large dose measurement.<BR>The possibility to realize such a system has been studied and application of the prevailing OSL dosemeters for this purpose has been proposed. The OSL dosemeter has the capability for storing large amount of irradiation defects in its crystals and also has such good characteristic of emitting luminescence that decreases exponentially at every repeated measurement. This particular performance was utilized for large dose evaluation. Continuous measurement of the dosemeter irradiated largely but sufficiently below the saturation level would enable to evaluate the irradiation dose by the number of measurement and each dose.<BR>In this experiment, a common blood irradiation facility and personal dosemeters were used. The largest dose was 30 Gy. Ordinary routine readers were adopted to measure the doses, which showed fairly good agreement with the delivered ones.

Measurement of Extremely Large Dose with OSL (Optically Stimulated Luminescence) Personal Dosemeters

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