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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Monochromatic wavelength dispersive x-ray fluorescence ： ウィキペディア英語版 Monochromatic wavelength dispersive x-ray fluorescence Monochromatic wavelength dispersive x-ray fluorescence (''MWD XRF'') is an enhanced version of conventional wavelength-dispersive X-ray spectroscopy (''WDXRF'') elemental analysis. The key difference is that MWD XRF uses a doubly curved crystal X-ray optic between the X-ray source and the sample resulting in monochromatic excitation.〔( Monochromatic wavelength dispersive x-ray fluorescence )〕〔G. Havrilla, et al., ("Monochromatic Wavelength Dispersive X-Ray Fluorescence for Improved Pu Assay" ) International Atomic Energy Agency Safeguards Symposium, November 2010 Vienna, Austria〕 This additional optic creates a high-intensity X-ray beam on a small spot size without increasing the power of the X-ray source. An MWD XRF instrument is constructed from a low-power X-ray tube, a point-to-point focusing optic for excitation, a sample cell, a focusing optic that collects the fluorescence from the sample, and an X-ray detector. By using an optic between the X-ray source and the sample, a monochromatic beam free of bremsstrahlung, excites the sample, eliciting the secondary fluorescence X-rays needed for elemental analysis. By restricting the band of wavelengths used for excitation, a much higher signal to background ratio is achieved. This type of excitation allows much lower limits of detection and faster reading times.〔Z. W. Chen, et al., (''Journal of ASTM International'' ) September 2005 Volume 2 No. 8〕 == References == 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Monochromatic wavelength dispersive x-ray fluorescence」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.