指甲电子顺磁共振波谱信号的剂量学性质

Study on dosimetric properties of fingernail electron paramagnetic resonance spectrum signals

收集并制备20例健康成人指甲,水清洗后,用137Csγ-射线照射指甲样品。照射后不同时间点用EPR(Electron paramagnetic resonance)波谱仪测量样品的信号。结果表明,γ-射线照射指甲后产生的信号(RIS)10 d以后比较稳定;指甲剪下后,68 d内本底信号(BS)随时间的延长逐渐增加;低于15 Gy剂量照射时,前8 d RIS信号强度随剂量逐渐增加。指甲EPR方法用于剂量重建时,必须考虑本底信号(BS)的影响。该方法可用于辐射事故后,人员受照剂量的快速筛选。

Twenty healthy adult fingernails were collected, water rinsed, and irradiated with 137Cs T-rays. EPR spectra were measured before and after exposure. The results show that the radiation-induced signal （RIS） in fingernails was relatively stable after the 10th day, and the background signal（BS） of the cut fingernail was gradually increased within 68 d; when fingernails were irradiated less than 15 Gy dose, RIS signal intensity increased with the dose in the first 8 d. The influence of intrinsic signals must be considered in dose reconstruction. Fingernail EPR method can be used for rapid screening of irradiated population after nuclear accidents.