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KMID : 0364920160410020179
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Journal of Radiation Protection and Research
2016 Volume.41 No. 2 p.179 ~ p.183
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Measuring Thermo-luminescence Efficiency of TLD-2000 Detectors to Different Energy Photons
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Xie Wei Min
Chen Bao Wei
Han Yi
Yang Zhong Jian
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Abstract
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Background: As an important detecting device, TLD is a widely used in the radiation monitoring. It is essential for us to study the property of detecting element. The aim of this study is to calculate the thermo-luminescence efficiency of TL elements.
Materials and Methods: A batch of thermo-luminescence elements were irradiated by the filtered X-ray beams of average energies in the range 40-200 kVp, 662 keV 137Cs gamma rays and then the amounts of lights were measured by the TL reader. The deposition energies in elements were calculated by theory formula and Monte Carlo simulation. The unit absorbed dose in elements by photons with different energies corresponding to the amounts of lights was calculated, which is called the thermo luminescent efficiency (η(E)). Because of the amounts of lights can be calculated by the absorbed dose in elements multiplyη(E), the η(E) can be calculated by the experimental data (the amounts of lights) divided by absorbed dose.
Results and Discussion: The deviation of simulation results compared with theoretical calculation results were less than 5%, so the absorbed dose in elements was calculated by simulation results in here. The change range of η(E) value, relative to 662 keV 137Cs gamma rays, is about 30% in the energy range of 33 keV to 662 keV, is in accordance by the comparison with relevant foreign literatures.
Conclusion: The η(E) values can be used for updating the amounts of lights that are got by the direct ratio assumed relations with deposition energy in TL elements, which can largely reduce the error of calculation results of the amounts of lights. These data can be used for the design of individual dosimeter which used TLD-2000 thermo-luminescence elements, also have a certain reference value for manufacturer to improve the energy-response performance of TL elements by formulation adjustment.
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KEYWORD
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Thermo-luminescence efficiency, Monte Carlo model, Personal dosimeter
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