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학제간연구 과학기술학 뇌인지과학 기술정책 기타 복합학

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논문 기본 정보

자료유형
학술저널
저자정보
Park, MinSeok (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) Kwon, Tae-Eun (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) Pak, Min Jung (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) Park, Se-Young (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) Ha, Wi-Ho (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences) Jin, Young-Woo (National Radiation Emergency Medical Center, Korea Institute of Radiological and Medical Sciences)
저널정보
대한방사선방어학회 방사선방어학회지 방사선방어학회지 제42권 제2호
발행연도
2017.1
수록면
83 - 90 (8page)

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Background: Different cases exist in the measurement of thyroid radiobioassays owing to the individual characteristics of the subjects, especially the potential variation in the counting efficiency. An In situ Object Counting System (ISOCS) was developed to perform an efficiency calibration based on the Monte Carlo calculation, as an alternative to conventional calibration methods. The purpose of this study is to evaluate the applicability of ISOCS to thyroid radiobioassays by comparison with a conventional thyroid monitoring system. Materials and Methods: The efficiency calibration of a portable high-purity germanium (HPGe) detector was performed using ISOCS software. In contrast, the conventional efficiency calibration, which needed a radioactive material, was applied to a scintillator-based thyroid monitor. Four radioiodine samples that contained $^{125}I$ and $^{131}I$ in both aqueous solution and gel forms were measured to evaluate radioactivity in the thyroid. ANSI/HPS N13.30 performance criteria, which included the relative bias, relative precision, and root-mean-squared error, were applied to evaluate the performance of the measurement system. Results and Discussion: The portable HPGe detector could measure both radioiodines with ISOCS but the thyroid monitor could not measure $^{125}I$ because of the limited energy resolution of the NaI(Tl) scintillator. The $^{131}I$ results from both detectors agreed to within 5% with the certified results. Moreover, the $^{125}I$ results from the portable HPGe detector agreed to within 10% with the certified results. All measurement results complied with the ANSI/HPS N13.30 performance criteria. Conclusion: The results of the intercomparison program indicated the feasibility of applying ISOCS software to direct thyroid radiobioassays. The portable HPGe detector with ISOCS software can provide the convenience of efficiency calibration and higher energy resolution for identifying photopeaks, compared with a conventional thyroid monitor with a NaI(Tl) scintillator. The application of ISOCS software in a radiation emergency can improve the response in terms of internal contamination monitoring.
#Radiation emergency #Radioactivity #Radioiodine #Monte Carlo method #Radiobioassay

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참고문헌 (19)

참고문헌 신청
Dantas BM / 2010 / A mobile bioassay laboratory for the assessment of internal doses based on in vivo and in vitro measurement / Health Phys 99:449~452 google schola Yoo JR / 2016 / Radiobioassay performance evaluation of urine and faeces samples for radiation emergency preparedness / J. Nucl. Sci. Technol 53(11):1742~1748 google schola International Commission on Radiological Protection / 1994 / Dose coefficients for intakes of radionuclides by workers :1~17 google schola International Commission on Radiological Protection / 1997 / Individual monitoring for internal exposure of workers :3~18 google schola National Council on Radiation Protection and Measurements / 1987 / Use of bioassay procedures for assessment of internal radionuclide deposition :19~31 google schola

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