关键词: 电阻, 热释光, 光释光, 辐射, 剂量评估

Abstract: For the purpose of rapid external radiation dose assessment in nuclear emergency medical rescue, thermoluminescence (TL) and optically stimulated luminescence (OSL) methods were used to detect the irradiated SMD resistance and their characteristics for emergency radiation dose assessment were studied. Experimental results indicated that: (1) Detection efficiency: radiation induced effective signal could be obtained with a detection time of 100 s; (2) Signal stability: the relative standard error of TL measurement for 10 Gy irradiated resistance was 4.3%, and the relative Standard error of OSL measurement was 3.4%; (3) Dose response linearity: in the range of 0-100 Gy, the linear correlation coefficient of TL measurement was 0.987 0, and the linear correlation coefficient of OSL measurement was 0.997 5. (4) The detection limit was 0.12 Gy for OSL measurement and 0.02 Gy for TL measurement, indicating that this method could meet the needs of acute radiation disease classification; (5) Time decay characteristics: the TL and OSL detection signals decayed fast in the first days and then slowly, which could be regarded as exponential type decay. This result showed that the time decay calibration should be considered in dose reconstruction. However, it still reserved sufficient sensitivity for dose reconstruction after 7-10 days.

Key words: resistance, thermoluminescence, optically stimulated luminescence, radiation, dosmetry