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자료유형
학술저널
저자정보
저널정보
한국원자력학회 Nuclear Engineering and Technology Nuclear Engineering and Technology 제51권 제1호
발행연도
2019.1
수록면
176 - 189 (14page)

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This paper presents a feasibility study for producing the medical isotope 99mTc using the hazardous andcurrently wasted radioisotope 99Tc. This can be achieved with the nuclear resonance fluorescence (NRF)phenomenon, which has recently been made applicable due to high-intensity laser Compton scattering(LCS) photons. In this work, 21 NRF energy states of 99Tc have been identified as potential contributors tothe photo-production of 99mTc and their NRF cross-sections are evaluated by using the single particleestimate model and the ENSDF data library. The evaluated cross sections are scaled using known measurementdata for improved accuracy. The maximum LCS photon energy is adjusted in a way to cover allthe significant excited states that may contribute to 99mTc generation. An energy recovery LINAC systemis considered as the LCS photon source and the LCS gamma spectrum is optimized by adjusting theelectron energy to maximize 99mTc photo-production. The NRF reaction rate for 99mTc is first optimizedwithout considering the photon attenuations such as photo-atomic interactions and self-shielding due tothe NRF resonance itself. The change in energy spectrum and intensity due to the photo-atomic reactionshas been quantified using the MCNP6 code and then the NRF self-shielding effect was considered toobtain the spectrums that include all the attenuation factors. Simulations show that when a 99Tc target isirradiated at an intensity of the order 1017 g/s for 30 h, 2.01 Ci of 99mTc can be produced

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