지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
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초록· 키워드
오류제보하기
Background: Industrial X-ray CT system is normally applied to non-destructive testing (NDT) for industrial product made from metal. Furthermore there are some special CT systems, which have an ability to inspect nuclear fuel assemblies or rocket motors, using high power and high energy (more than 6 MeV) pulsed X-ray source. In these case, pulsed X-ray are produced by the electron linear accelerator, and a huge number of photons with a wide energy spectrum are produced within a very short period. Consequently, it is difficult to measure the X-ray energy spectrum for such accelerator-based X-ray sources using simple spectrometry. Due to this difficulty, unexpected images and artifacts which lead to incorrect density information and dimensions of specimens cannot be avoided in CT images. For getting highly precise CT images, it is important to know the precise energy spectrum of emitted X-rays. Materials and Methods: In order to realize it we investigated a new approach utilizing the Bayesian estimation method combined with an attenuation curve measurement using step shaped attenuation material. This method was validated by precise measurement of energy spectrum from a 1 MeV electron accelerator. In this study, to extend the applicable X-ray energy range we tried to measure energy spectra of X-ray sources from 6 and 9 MeV linear accelerators by using the recently developed method. Results and Discussion: In this study, an attenuation curves are measured by using a step-shaped attenuation materials of aluminum and steel individually, and the each X-ray spectrum is reconstructed from the measured attenuation curve by the spectrum type Bayesian estimation method. Conclusion: The obtained result shows good agreement with simulated spectra, and the presently developed technique is adaptable for high energy X-ray source more than 6 MeV.
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등록된 정보가 없습니다.
참고문헌 (10)
참고문헌 신청
Waggener RG / 1999 / X-ray spectra estimation using attenuation measurement from 25kVp to 18 MV / Med. Phys 26:1269~1278
Iwasaki A / 2006 / Characteristic features of a high-energy x-ray spectra estimation method based on the Waggener iterative perturbation principle / Med. Phys 33:4056~4063
Kanno I / 2008 / A current-mode detector for unfolding X-ray energy distribution / J. Nucl. Sci. Technol 45(11):1165~1170
Takagi H / 2016 / Development of precise energy spectrum measurement technique for high power pulsed X-ray sources for industrial use / J. Nucl. Sci. Technol 53(6):766~773
Hirayama H / 2006 / The EGS5 code system / SLAC-R-730 :1~436
Iwasaki A / 2006 / Characteristic features of a high-energy x-ray spectra estimation method based on the Waggener iterative perturbation principle / Med. Phys 33:4056~4063
Kanno I / 2008 / A current-mode detector for unfolding X-ray energy distribution / J. Nucl. Sci. Technol 45(11):1165~1170
Takagi H / 2016 / Development of precise energy spectrum measurement technique for high power pulsed X-ray sources for industrial use / J. Nucl. Sci. Technol 53(6):766~773
Hirayama H / 2006 / The EGS5 code system / SLAC-R-730 :1~436
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