Diffraction, Extraction and Focusing of Parametric X-Ray Radiation, Channeling Radiation and Crystal Undulator Radiation From a Bent Crystal

Shchagin, A. V.

doi:10.1007/1-4020-3450-4_03

Cited by 4 publications

(4 citation statements)

References 11 publications

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“…The method used in this study obtained the contrast from the phase shift of Xrays transmitted through the subject, which was caused by Xray refraction. Since the phasecontrast method has approximately 1000 times the sensitivity in the light element region than the absorptioncontrast method, it is easy to identify small compositional and density differences of substances, such as polymer materials and biological soft tissues, and may apply to some biological hard tissues (17) .…”

Section: Methodsmentioning

confidence: 99%

“…The classification of phase contrast imaging is shown in Figure 1. The Laboratory for Electron Beam Research and Application (LEBRA) , Nihon University, has developed a variable energy monochromatic Xray source that uses PXR as a radiation source with its own design (16,17) . The imaging experiments using coherent Xrays, other than from largescale synchrotron radiation facilities, were successful for the first time at a smallscale facility.…”

Section: Introductionmentioning

confidence: 99%

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Diffraction-enhanced Imaging of Human Tooth Using Highly Spatial Coherent Parametric X-ray Generated by a Small LINAC System

et al. 2022

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Fine histological structures of human tooth were examined through diffractionenhanced imaging using highly spatial coherent parametric Xray (PXR) generated by a smallscale electron accelerator at the Laboratory for Electron Beam Research and Application (LEBRA) , Nihon University. LEBRA -PXR is used as an electron linear accelerator (LINAC)based jointuse Xray source to facilitate advanced Xray imaging experiments such as phasecontrast imaging with diffractionenhanced imaging (DEI) , which has been considered difficult to perform outside a synchrotron radiation facility.In this study, several microscopicorder structures of the enamel and dentin were identified through ultrasmallangle Xray scattering (USAXS) imaging using DEI, although these structures were not visualized through refractionangle image of DEI except for the contour lines of the tooth and enameldentin junction. In USAXS images, local variations in dentin structures, particularly in the presence of microsized tubules, such as dentin tubules, were visualized differently depending on the sample orientation. The specimen's appearance when the tooth axis was parallel to the floor differed from that when it was vertical to the floor. Such directional dependence is unique to LEB-RA -PXR, which is sensitive to horizontal but not vertical refraction and scattering. The orientation of anisotropic sample structures was confirmed by changing the sample orientation. PXR generated in a small LINAC system was sufficient to observe tooth histological structures. Technical improvements should lead to clearer and more detailed images of innerteeth structures, and the possibility of threedimensional construction using phase contrast imaging would help in detailed elucidation of tooth development, growth, and calcification mechanism.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Diffraction-enhanced Imaging of Human Tooth Using Highly Spatial Coherent Parametric X-ray Generated by a Small LINAC System

et al. 2022

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“…2 eff T a (20) instead of Eqs. (17) and (18) for rough estimation of possibility of existence of the PXR diffracted in forward direction.…”

Section: Diffraction Of Pxr In Forward Direction From Electrons Of Momentioning

confidence: 97%

<title>Diffraction in forward direction of parametric X-ray radiation from relativistic particles of moderate energy</title>

Shchagin

2007

SPIE Proceedings

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The analytical expressions for the difference between the classical frequency of the parametric X-ray radiation (PXR) and the Bragg frequency in the PXR reflection are derived. The difference increases proportionally to the square of the angular distance to the PXR reflection center and also the Bragg frequency always exceeds the PXR one from the same system of crystallographic planes. A possibility of the existence of PXR diffraction from electrons of moderate energy to forward direction due to PXR peak broadening in a thin crystal and also in polycrystal or mosaic crystal is described. The experiment at accelerator for observation of PXR diffracted to forward direction in textured polycrystal or mosaic crystal is proposed. Application of PXR spectral peak broadening for measurement of thin crystal thickness, crystalline grains or domains size is proposed.

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“…[1,2]. The parametric X-ray radiation from a crystalline target can be applied for measurements of the beam transverse dimensions [3] and for online diagnostics of the beam deflection in a bent crystal as well as the bent crystal state [4,5]. However, the radiation background in the vicinity of the accelerator can be significant at measurements of X-ray spectra, see e.g.…”

Section: Introductionmentioning

confidence: 99%

Characteristic X-ray radiation excited by 450 MeV/nucleon C+6 ions and 1.3 GeV protons in extracted and circulated beams of accelerator U70

Afonin

Britvich

Chesnokov

et al. 2015

Nuclear Instruments and Methods in Physics Research Section B:

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Diffraction, Extraction and Focusing of Parametric X-Ray Radiation, Channeling Radiation and Crystal Undulator Radiation From a Bent Crystal

Cited by 4 publications

References 11 publications

Diffraction-enhanced Imaging of Human Tooth Using Highly Spatial Coherent Parametric X-ray Generated by a Small LINAC System

Diffraction-enhanced Imaging of Human Tooth Using Highly Spatial Coherent Parametric X-ray Generated by a Small LINAC System

<title>Diffraction in forward direction of parametric X-ray radiation from relativistic particles of moderate energy</title>

Characteristic X-ray radiation excited by 450 MeV/nucleon C+6 ions and 1.3 GeV protons in extracted and circulated beams of accelerator U70

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