Measurement of neutron spectra using an extended bonner multisphere spectrometry system = 광역 보너 다중구 분광시스템을 이용한 중성자 스펙트럼 측정에 관한 연구

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In spite of the poor resolution the Bonner multiSphere spectrometer (BS) has a several kinds of merits in use such as high sensitivity, wide range of energy response from thermal to a few hundred mega-electron volt neutron, isotropic response and easy operation. And therefore it has been used as a neutron spectrometer in the field of radiation protection dosimetry since 1960. But the conventional BS could not detect effectively a neutron over a few tens of mega electron volt due to the low sensitivity to it. From 1990s the need for neutron spectrometry around high-energy particle accelerators and in the atmospheric environment at high altitudes have increased because a human being is exposed to high-energy neutrons more often than before. If the BS is modified to make the neutron multiplication reaction possible by inserting a high atomic number material like a copper or a lead inside it, a high-energy neutron can be measured more effectively. In this study an extended BS that has a lead shell inside or outside the conventional BS was constructed to measure a high-energy neutron. New BS sets, which use a LiI(Eu) scintillator as the thermal neutron detector, with six kinds of lead shells including the conventional BS were designed and constructed. The response functions of new BS sets consisting of thirteen spheres, seven PE spheres and six kinds of lead shells, were calculated using the MCNPX code (Ver. 2.4.0) and constructed as the library for the unfolding code, MXD_FC31. This new BS was calibrated in the neutron calibration laboratory of Korea Atomic Energy Research Institute (KAERI) using a $^{252}Cf$ source. The thirteen kinds of neutron spectra, consisting of five spectra from radioisotopes, six from a proton accelerator and two from an electron LINAC, were measured using the new BS. Following one of the recommendations of ISO, five scattered neutron calibration fields (SNCF) were manufactured as the realistic neutron spectra used in the calibrat...
Advisors
Cho, Gyu-Seongresearcher조규성researcher
Description
한국과학기술원 : 원자력및양자공학과,
Publisher
한국과학기술원
Issue Date
2004
Identifier
240644/325007  / 000985062
Language
eng
Description

학위논문(박사) - 한국과학기술원 : 원자력및양자공학과, 2004.8, [ ix, 97 p. ]

Keywords

UNFOLDING; NEUTRON DOSIMETRY; NEUTRON SPECTROMETRY; EXTENDED BONNER SPHERE; FLUENCE SPECTRUM; 입자선속 스펙트럼; 언폴딩; 중성자 선량가; 중성자 분광기법; 광역보너구

URI
http://hdl.handle.net/10203/48972
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=240644&flag=dissertation
Appears in Collection
NE-Theses_Ph.D.(박사논문)
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