研究目的
Investigating the effect of high dose on the sensitivity of optically stimulated luminescence dosimeters (OSLDs) and evaluating the reusability of OSLDs after high-dose irradiation.
研究成果
High-dose irradiation causes a decrease in OSLD sensitivity, modeled exponentially. Reuse of OSLDs after high doses requires careful management of irradiation history to reduce measurement errors, but disposal after single use may be preferable for accuracy.
研究不足
The study is limited to Co-60 gamma rays and specific OSLD models; results may not generalize to other radiation types or dosimeters. The research does not cover doses beyond 30 Gy or other environmental factors affecting sensitivity.
1：Experimental Design and Method Selection:
The study used Co-60 gamma rays and a commercial OSLD system. Radiation sensitivity was defined as count/dose, and relative radiation sensitivity was calculated. Changes in sensitivity were analyzed with repeated irradiations and high-dose exposures, modeled using exponential equations.
2：Sample Selection and Data Sources:
New OSLDs were chosen arbitrarily. Samples were selected based on batch sensitivity and reproducibility criteria, with groups irradiated with 1 Gy repeatedly or high doses of 15 Gy and 30 Gy.
3：List of Experimental Equipment and Materials:
OSLDs (nanoDotTM Dosimeter, Landauer Inc.), InLight MicroStar reader (Landauer, Inc.), fluorescent lamp for annealing (Hanil Nuclear Co.), Co-60 gamma ray irradiator (Theratron 780, AECL and Kanta).
4：Experimental Procedures and Operational Workflow:
OSLDs were irradiated with 1 Gy repeatedly up to 30 times, with optical annealing between irradiations. High-dose groups were irradiated with 15 Gy or 30 Gy, followed by 10 irradiations of 1 Gy. Sensitivity and residual counts were measured after each step.
5：Data Analysis Methods:
Sensitivity changes were analyzed using linear and exponential curve fitting. Coefficient of variation was calculated for reproducibility. Statistical analysis included r-squared values for model fits.
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