1999 Fiscal Year Final Research Report Summary
High-efficiency and high-resolution broad-range fluorescent x-ray spectrometry using a two-dimensional position-sensitive counter
| Project/Area Number |
09650072
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Applied physics, general
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| Research Institution | Nagaoka National College of Technology |
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Principal Investigator |
MIZOGAWA Tatsumi Nagaoka National College of Technology, Associate Professor, 電子制御工学科, 助教授 (20229719)
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| Co-Investigator(Kenkyū-buntansha) |
ITOH Yosiro Faculty of Engineering, Nagaoka University of Technology, Associate Professor, 工学部, 助教授 (60176378)
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| Project Period (FY) |
1997 – 1999
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| Keywords | x-ray / spectrometer / two-dimensional / position-sensitive / proportional counter / flat crystal |
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| Research Abstract |
Properties of a fluorescent x-ray spectrometer which consists of a flat crystal and a two-dimensional position-sensitive proportional counter based on the MBWC technique has been studied. Observed x-ray energy resolution generally shows non-linear dependence on the distance between a crystal and the PSPC and gives minimum around the distance equal to the distance between an x-ray source and the crystal. This phenomenon is interpreted as approximate focusing of reflected x-rays due to mosaic structure of the crystal. The dependence of the energy resolution on the PSPC-crystal distance has been measured for four crystals ; LiF (200), Si (111), graphite, and Ge (111). The "mosaic focusing" is observed most strongly for the graphite crystal. At a resolution minimum Fe Kα1 and Kα2 peaks are resolved, despite of the large mosaic spread 0.4°. As the PSPC-crystal distance increases or decreases apart from the resolution minimum, the resolution degrades with a gradient expected from the mosaic spread. This result fox a graphite crystal combined with the present spectrometer is specially important, because it means that the highest x-ray reflectivity of graphite among all the other crystals consists with moderately high energy-resolution in the present type of spectrometers. The other crystals also show the non-linearity to various extent.
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