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J. Radiat. Prot. Res > Volume 40(4); 2015 > Article
Journal of Radiation Protection and Research 2015;40(4):194-201.
doi: https://doi.org/10.14407/jrp.2015.40.4.194
방사선사고시 피폭선량평가를 위한 휴대전화 부품의 전자상자성공명(EPR) 특성에 대한 예비 연구
박병룡, 하위호, 박선후, 이진경, 이승숙
Preliminary Study on Electron Paramagnetic Resonance(EPR) Signal Properties of Mobile Phone Components for Dose Estimation in Radiation Accident
Byeong Ryong Park, Wi-Ho Ha, Sunhoo Park, Jin Kyeong Lee, Seung-Sook Lee
Korea Institute of Radiological and Medical Sciences
Correspondence  Wi-Ho Ha ,Email: lovin@kirams.re.kr
Received: April 21, 2015; Revised: September 17, 2015   Accepted: September 17, 2015.
We have investigated the EPR signal properties in 12 components of two mobile phones (LCD, OLED) using electron paramagnetic resonance (EPR) spectrometer in this study.EPR measurements were performed at normal atmospheric conditions using Bruker EXEXSYS-II E500 spectrometer with X-band bridge, and samples were irradiated by 137Cs gamma-ray source. To identify the presence of radiation-induced signal (RIS), the EPR spectra of each sample were measured unirradiated and irradiated at 50 Gy. Then, dose-response curve and signal intensity variating by time after irradiation were measured. As a result, the signal intensity increased after irradiation in all samples except the USIM plastic and IC chip. Among the samples, cover glass(CG), lens, light guide plate(LGP) and diffusion sheet have shown fine linearity (R2 > 0.99). Especially, the LGP had ideal characteristics for dosimetry because there were no signal in 0 Gy and high rate of increase in RIS. However, this sample showed weakness in fading. Signal intensity of LGP and Diffusion Sheet decreased by 50% within 72 hours after irradiation, while signals of Cover Glass and Lens were stably preserved during the short period of time. In order to apply rapidly EPR dosimetry using mobile phone components in large-scale radiation accidents, further studies on signal differences for same components of the different mobile phone, fading, pretreatment of samples and processing of background signal are needed. However, it will be possible to do dosimetry by dose-additive method or comparative method using unirradiated same product in small-scale accident.
Keywords: Radiation accident, Electron spin resonance, Electron paramagnetic resonance, Dosimetry
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