CAJ | 학술논문

目的探讨运用电子顺磁共振(electron paramagnetic resonance,EPR)波谱拟合技术估算牙釉质EPR辐射剂量的准确性.方法编制多成分叠加型EPR粉末波谱拟合软件,分别拟合牙齿本底信号( background signal,BS)和辐照诱发信号(radiation-induced signal,RS)的EPR波谱模型,用波谱模型叠加计算方法拟合出实际辐照后牙釉质的EPR波谱,从复合谱中提取出RS成分并计算其相对强度,建立剂量响应曲线,估算样品剂量,并将剂量估算结果与传统的波谱强度测量方法进行比较.结果拟合获得的BS信号为单峰高斯线形粉末谱,g=2.0035,线宽Hpp=0.650 -1.100 mT; RS信号为轴对称多晶粉末谱线形,其g(1)=2.0018,g(11)=1.9965,线宽Hpp=0.335 -0.400 mT；分离BS与RS后得到的RS相对强度与辐照剂量呈线性相关,剂量响应方程为:y=240.74x+ 76 724( R2=0.9947),剂量估算结果相对误差期望值为0.13.结论 EPR波谱拟合方法在一定程度上提高了牙釉质辐射剂量估计的准确性和可信度.
목적 탐토운용전자순자공진(electron paramagnetic resonance,EPR)파보의합기술고산아유질EPR복사제량적준학성.방법 편제다성분첩가형EPR분말파보의합연건,분별의합아치본저신호( background signal,BS)화복조유발신호(radiation-induced signal,RS)적EPR파보모형,용파보모형첩가계산방법의합출실제복조후아유질적EPR파보,종복합보중제취출RS성분병계산기상대강도,건립제량향응곡선,고산양품제량,병장제량고산결과여전통적파보강도측량방법진행비교.결과 의합획득적BS신호위단봉고사선형분말보,g=2.0035,선관Hpp=0.650 -1.100 mT; RS신호위축대칭다정분말보선형,기g(1)=2.0018,g(11)=1.9965,선관Hpp=0.335 -0.400 mT；분리BS여RS후득도적RS상대강도여복조제량정선성상관,제량향응방정위:y=240.74x+ 76 724( R2=0.9947),제량고산결과상대오차기망치위0.13.결론 EPR파보의합방법재일정정도상제고료아유질복사제량고계적준학성화가신도.
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 =2.00 35 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(1) =2.0018,g (11) =1.996 5,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.