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Abstract
In this study, we validated the feasibility of an energy weighted algorithm that highlights a characteristic area including the Compton edge as a single peak in a proof-of-principle radiation portal monitor system with a plastic scintillator measuring 50 × 100 × 5 cm3. We measured the energy weighted spectra with steel shielding and the dynamic movements of the 137Cs and 60Co sources. The results showed that the peak locations of each source could be identified under shielded or dynamic motion conditions, each within a maximum difference of 0.08 MeV.

Fig. 1. Trends in energy weighted spectra after applying the linear energy coefficient to the energy spectra with: (A) a constant count and (B) a gamma source measured with PVT.

Fig. 2. (A) Energy spectra measured for 137Cs, 226Ra, 22Na, and 60Co using the proof-of-principle RPM system. (B) Calculated energy-weighted spectra.

Author information

Lee HC1, Shin WG1, Choi HJ1, Choi CI2, Park CS2, Kim HS2, Min CH3.
1
Department of Radiation Convergence Engineering, Yonsei University, Wonju, Republic of Korea.
2
Radiological Emergency & Security Preparedness Department, Korea Institute of Nuclear Safety, Daejeon, Republic of Korea.
3
Department of Radiation Convergence Engineering, Yonsei University, Wonju, Republic of Korea. Electronic address: chmin@yonsei.ac.kr.

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