STUDY OF ELEMENTAL CONCENTRATION AND DISTRIBUTION IN HUMAN FEMORAL HEAD BY PIXE AND SRXRF

2005 ◽  
Vol 15 (03n04) ◽  
pp. 153-159
Author(s):  
YUANXUN ZHANG ◽  
FENG CHENG ◽  
YINSONG WANG ◽  
YONGPING ZHANG ◽  
GUILIN ZHANG ◽  
...  
Keyword(s):  
Femoral Head ◽  
Elemental Concentration ◽  
Scientific Basis ◽  
Control Group ◽  
Elemental Distribution ◽  
X Ray ◽  
Inorganic Substances ◽  
Analysis Technique ◽  
Quantitative Computerized Tomography

In order to explore the distribution and the loss way of inorganic substances in bone and to provide scientific basis for prevention and therapy of osteoporosis, Proton Induced X-ray Emission (PIXE) method is used for the determination of elemental concentration in femoral head from five autopsies and seven patients with femoral neck broken, and Synchrotron Radiation X-ray Fluorescence (SRXRF) microprobe analysis technique is used to scan a slice of the femoral head from its periphery to its center, via cartilage, compact and spongy zones. The results show that the concentrations of P , Ca , Fe , Cu , Sr in a control group are higher than those in a patient group, but the concentrations of S , K , Zn , Mn are not significantly different. The quantitative computerized tomography of elemental distribution, such as Ca , P , K , Fe , Zn , Sr and Pb in bone slice tissue including cartilage, substantial compact and substantial spongy, is investigated. Combined with the correlations between P , K , Zn , Sr and Ca , the loss way of minerals and the physiological functions of some metal elements in bone are also discussed.

STUDY OF METALLIC ELEMENT DISTRIBUTION IN CANCELLOUS BONE OF FEMORAL HEAD BOTH YOUTH AND OLD PEOPLE BY PIXE

1999 ◽  
Vol 09 (03n04) ◽  
pp. 291-296 ◽  
Author(s):  
YUANXUN ZHANG ◽  
DEYI LI ◽  
YONGPING ZHANG ◽  
YONGPENG TONG ◽  
SHIJING QIU ◽  
...  
Keyword(s):  
Femoral Head ◽  
Cancellous Bone ◽  
Elemental Concentration ◽  
Element Distribution ◽  
Control Group ◽  
Specimen Preparation ◽  
Old People ◽  
Experimental Procedure ◽  
Pixe Method

Proton Induced X-ray Emission (PIXE) method is used for the determination of elemental concentration in a cancellous bone of human femoral head from five autopsies and seven patients with femoral neck broken. Specimen preparation and experimental procedure are described in detail. Using t test, the results show that the concentrations of P , Ca , Fe , Cu , Sr in a control group are higher than those in a patient group, but the concentrations of S , K , Zn , Mn are not significantly different. The physiological functions of metal elements in human bone are also discussed.

The 20keV Break in the Diffuse X-ray Background Spectrum

1977 ◽  
Vol 3 (2) ◽  
pp. 131-132
Author(s):  
R. M. Hudson ◽  
R. M. Thomas ◽  
M. L. Duldig
Keyword(s):  
Spectral Index ◽  
Simple Analysis ◽  
Background Spectrum ◽  
X Ray ◽  
Independent Determination ◽  
Analysis Technique ◽  
X Ray Background

In this paper we report an independent determination of the Location of the break (change in spectral index) in the spectrum of the diffuse X-ray background by applying a simple analysis technique to data already in the literature.

Grazing Incidence X-Ray Fluorescence Analysis using Synchrotron Radiation

1991 ◽  
Vol 35 (B) ◽  
pp. 795-806
Author(s):  
Atsuo Iida
Keyword(s):  
Synchrotron Radiation ◽  
Elemental Concentration ◽  
Depth Distribution ◽  
Fluorescence Analysis ◽  
Grazing Incidence ◽  
Material Surface ◽  
Fluorescence Signal ◽  
Elemental Distribution ◽  
X Ray ◽  
Glancing Angle

AbstractThe X-ray fluorescence analysis of a trace element under a grazing incidence condition has been developed using synchrotron radiation. The interference effect plays an important role for determining the depth distribution of the elemental concentration. The elemental distribution above, on or below the material surface has been studied. The glancing angle dependence of the X-ray fluorescence signal around the critical angle strongly reflects the elemental distribution, and can be used to determine the position of the element of interest.

Quantitative mineral compositional analysis using digital x-ray images

1991 ◽  
Vol 49 ◽  
pp. 746-747
Author(s):  
Long C. Liang
Keyword(s):  
Image Analysis ◽  
Electron Microprobe ◽  
Elemental Concentration ◽  
Compositional Analysis ◽  
Beam Current ◽  
Mapping Technique ◽  
Elemental Distribution ◽  
X Ray ◽  
System A ◽  
X Ray Imaging

Digital x-ray imaging (DXI) has been utilized to display spatial elemental distribution and to conduct quantitative elemental compositional mapping on various samples. The quantitative elemental compositional mapping technique, however, requires the use of an advanced image analysis and computer system to display elemental concentration maps. In this study, a simplified DXI technique is used to achieve two goals: (1) display elemental distribution, and (2) conduct quantitative mineral compositional analysis using stored digital x-ray maps. The analytical procedure of this technique can be easily implemented to similar instruments in any laboratory.Quantitative analysis with the simplified DXI technique is performed using background-corrected elemental pixel intensities instead of using net x-ray counts as in a conventional electron microprobe analysis. In this study, digital x-ray mapping has been conducted using a JEOL 733 electron microprobe automated with a Tracor Northern (TN) 5500/5600 system. A TN image analysis program, IPP, was used to acquire all digital x-ray maps at an accelerating voltage of 15 kV and a beam current of 15 nA.

Micro-PIXE analysis system at NIRS-electrostatic accelerator facility for various applications

2015 ◽  
Vol 25 (03n04) ◽  
pp. 217-225 ◽  
Author(s):  
Masakazu Oikawa ◽  
Noriyoshi Suya ◽  
Teruaki Konishi ◽  
Takahiro Ishikawa ◽  
Tsuyoshi Hamano ◽  
...  
Keyword(s):  
Environmental Science ◽  
Ion Beam ◽  
Elemental Distribution ◽  
Accelerator Facility ◽  
Pixe Analysis ◽  
Electrostatic Accelerator ◽  
X Ray ◽  
Beam Analysis ◽  
Analysis System

A micro-PIXE analysis system based on the ion beam analysis system by Oxford Microbeams Ltd. has been developed at the NIRS-electrostatic accelerator facility. The introduction of the CdTe X-ray detector dramatically improved the detection efficiencies for heavy elements that are important in the life sciences and environmental science. This system has been used for various projects and has provided several meaningful results, thus establishing the micro-PIXE system as an effective tool for the determination of elemental distribution with a high spatial resolution. In this paper, outline of the features of the micro-PIXE system at NIRS along with its recent application in research are introduced.

X-ray microanalysis of frozen plant cells and tissues

1992 ◽  
Vol 50 (2) ◽  
pp. 1588-1589
Author(s):  
Abraham Boekestein ◽  
Anke C.M. Clerkx ◽  
Ruud Verkerke ◽  
Norbert Ammann ◽  
Robert P. Baayen
Keyword(s):  
Cross Sections ◽  
Plant Cells ◽  
Ice Crystals ◽  
Tissue Preparation ◽  
Analysis Method ◽  
Ion Content ◽  
X Ray ◽  
Analysis Technique

The determination of concentrations of relatively freely diffusable ions in localized compartments of botanical tissues has become an essential technique in plant physiology . In order to analyze approximately the in vivo elemental concentrations, the scanning electron microscope has been adapted to facilitate the observation of frozen-fractured botanical cross-sections, thus enabling electronprobe X-ray microanalysis of the exposed surface. Although the analysis technique seems to have come in its productive years, it still has a number of unsolved problems, which are both related to the preparation of frozen-hydrated specimens and to the analysis method itself.The most important problem in quantitative X-ray microanalysis of frozen-hydrated biological specimens, is the avoidance of ice crystallization artefacts. This phenomenon is rather critical in botanical tissue preparation because plant cells are relatively big and almost entirely occupied by a central vacuole. In this situation ice crystals can grow to large dimensions and disturb the originally homogeneous ion content.

Energy-Dispersive X-Ray Techniques for Accurate Heavy Element Assay

1986 ◽  
Vol 30 ◽  
pp. 285-292 ◽  
Author(s):  
H. Ottmar ◽  
H. Eberle ◽  
P. Matussek ◽  
I. Michel-Piper
Keyword(s):  
Absorption Edge ◽  
Heavy Element ◽  
Accurate Determination ◽  
Energy Dispersive ◽  
X Rays ◽  
Specific Absorption ◽  
X Ray ◽  
Xrf Analysis ◽  
Analysis Technique

Energy-dispersive X-ray techniques can be employed in two different ways for the accurate determination of element concentrations in specimens: (1) spectrometry of fluoresced characteristic X-rays as widely applied in the various modes of the traditional XRF analysis technique, and (2) spectrometry of the energy-differential transmittance of an X-ray continuum at the element-specific absorption-edge energies.

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