太阳光照射产生的牙釉质电子自旋共振信号的稳定性研究  

Time Stability of Tooth Enamel Electron Spin Resonance Signal Induced by Solar Radiation

作　　者：焦玲[1] 张文艺[1] 丁艳秋[1] 寇明英[1] 张良安[1] 

机构地区：[1]中国医学科学院放射医学研究所,天津300192

出　　处：《辐射防护》2010年第2期91-95,共5页Radiation Protection

摘　　要：对不同的牙釉质样品分别进行60Coγ射线和太阳光的照射,放置不同时间后,使用电子自旋共振(ESR)谱仪测量ESR信号的强度,研究不同种类辐射照射后牙釉质所产生的ESR信号强度随时间的变化。结果表明,60Coγ射线照射后产生的牙釉质ESR信号,其剂量学峰的信号很稳定。太阳光照射与γ射线照射具有相同的剂量学峰的信号,最后一次照射后2年半,其强度衰减约20%;紧邻本底和另一较弱信号衰减约30%;信号相对稳定,对剂量学信号和本底水平可能会有一定的影响。所以用牙釉质ESR信号的剂量学峰进行剂量重建时,尤其是在低剂量区域内,应该认真考虑并去除其他种类辐射引起的影响。To study time stability of tooth enamel ,ESR signal caused by solar radiation. Measured intensifies of ESR spectrum at different periods after the enamel samples were exposed to ^60Co γ ray and sunlight respectively. The dosimetric peak （g= 2.001 8） produced by ^60Co γ ray is very stable. The peak with same g factor caused by solar radiation decreased by about 20%, the peak closed to background decayed by about 30% after 900 days. This indicates that the solar radiation induced signals were stabilized basically. Account should be taken of their effects on dosimetric signal and background when tooth enamel is used to reconstruct radiation below several hundreds mGy.

关 键 词：太阳光辐射 牙釉质 电子自旋共振 剂量学 稳定性 

分 类 号：R144.1[医药卫生—公共卫生与预防医学]