| DONG Guo-fu,CONG Jian-bo,GUO Lin-chao,et al.Enamel dose calculation by electron paramagnetic resonance spectral simulation technique[J].Chinese Journal of Radiological Medicine and Protection,2011,31(6):709-712 |
| Enamel dose calculation by electron paramagnetic resonance spectral simulation technique |
| Received:April 25, 2011 |
| DOI：10.3760/cma.j.issn.0254-5098.2011.06.024 |
| KeyWords:Electron paramagnetic resonance Spectral simulation Enamel Dose estimation |
| FundProject:国家自然科学基金(30970693) |
| Author Name | Affiliation | | DONG Guo-fu | Beijing Institute of Radiation Medicine, Beijing 100850,China | | CONG Jian-bo | Beijing Institute of Radiation Medicine, Beijing 100850,China | | GUO Lin-chao | Beijing Institute of Radiation Medicine, Beijing 100850,China | | NING Jing | Beijing Institute of Radiation Medicine, Beijing 100850,China | | XIAN Hong | Beijing Institute of Radiation Medicine, Beijing 100850,China | | WANG Chang-zhen | Beijing Institute of Radiation Medicine, Beijing 100850,China | | WU Ke | Beijing Institute of Radiation Medicine, Beijing 100850,China |
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| Abstract:: |
| Objective To optimize the enamel electron paramagnetic resonance (EPR) spectral processing by using the EPR spectral simulation method to improve the accuracy of enamel EPR dosimetry and reduce artificial error. Methods The multi-component superimposed EPR powder spectral simulation software was developed to simulate EPR spectrum models of the background signal(BS)and the radiation-induced signal(RS)of irradiated enamel respectively. RS was extracted from the multi-component superimposed spectrum of irradiated enamel and its amplitude was calculated. The dose-response curve was then established for calculating the doses of a group of enamel samples. The result of estimated dose was compared with that calculated by traditional method. Results BS was simulated as a powder spectrum of gaussian line shape with the following spectrum parameters: g=2.0035 and Hpp=0.65-1.1 mT,RS signal was also simulated as a powder spectrum but with axi-symmetric spectrum characteristics. The spectrum parameters of RS were: g⊥=2.0018,g‖=1.9965,Hpp=0.335-0.4 mT. The amplitude of RS had a linear response to radiation dose with the regression equation as y=240.74x+76 724(R2=0.9947). The expectation of relative error of dose estimation was 0.13. Conclusions EPR simulation method has improved somehow the accuracy and reliability of enamel EPR dose estimation. |
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