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Energy dispersive x-ray diffraction system: A response function for the CZT detector and an analysis of noise at low momentum transfer arguments.

机译：能量色散X射线衍射系统：CZT检测器的响应函数，以及低动量传递参数下的噪声分析。

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A cadmium zinc tellurium (CZT) detector is employed in a custom made energy dispersive x-ray diffraction (EDXD) system to investigate the potential of identifying breast cancer. An analytical model for the response of the CZT detector in the diagnostic energy range was formulated. Hole tailing and fluorescence escape are two major problems of the CZT detector that were characterized in the model. The generated response functions and the full energy peak efficiencies for energies ranging from 0.2 to 100 keV agree well with the results obtained via Monte Carlo (GEANT4 simulation package) methods. The response functions were applied to extract the mean free paths of electrons lambdae) and holes (lambdah) of the CZT detector. An 241Am spectrum was unfolded and fitted with the model to yield lambdae = 200 cm and lambdah = 0.04 cm. The response functions were used to correct 50 kV x-ray spectra measured with the CZT detector. The extra counts at lower energies caused by fluorescence escape and hole tailing were removed and put back to higher energy bins. Corrections were also applied to diffraction data and it was found that a correction for the response has minor impact on the diffraction data. Since there exist problems with the diffraction data at low momentum transfer arguments (x) a preliminary analysis of noise at low x was conducted. The scatter from the 3 mm diameter pinhole used to define the beam area on the target samples was 6% of the primary beam. A new CdTe detector has been recently purchased for the diffraction system. This detector has less problems with hole tailing and noise. The analytical model was applied to calculate the response functions of the CdTe detector.

机译：定制的能量色散X射线衍射（EDXD）系统中使用了镉锌碲（CZT）检测器，以研究识别乳腺癌的潜力。建立了诊断能量范围内CZT检测器响应的分析模型。空穴拖尾和荧光逸出是模型中表征的CZT检测器的两个主要问题。生成的响应函数和0.2至100 keV的能量的全能量峰值效率与通过Monte Carlo（GEANT4仿真程序包）方法获得的结果非常吻合。应用响应函数来提取CZT检测器的电子lambdae和空穴（lambdah）的平均自由程。展开一个241Am光谱，并与该模型拟合以产生lambdae = 200 cm和lambdah = 0.04 cm。响应函数用于校正使用CZT检测器测得的50 kV X射线光谱。减少了因荧光逸出和空穴拖尾而在较低能量下产生的额外计数，并将其放回到较高能量的容器中。还对衍射数据进行了校正，发现响应的校正对衍射数据影响很小。由于在低动量传递变量（x）处的衍射数据存在问题，因此对低x处的噪声进行了初步分析。用于定义目标样品上光束区域的直径3毫米针孔的散射为主光束的6％。最近为衍射系统购买了新的CdTe检测器。该检测器的孔拖尾和噪声问题较少。应用分析模型计算CdTe检测器的响应函数。

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作者
Wang, Yinkun.;
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Laurentian University (Canada).;

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授予单位 Laurentian University (Canada).;
学科 Health Sciences Radiology.;Biophysics Medical.;Physics Radiation.
学位 M.Sc.
年度 2006
页码 112 p.
总页数 112
原文格式 PDF
正文语种 eng
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专利

1. An analytic model for the response of a CZT detector in diagnostic energy dispersive x-ray spectroscopy. [J] . LeClair RJ, Wang Y, Zhao P, Medical Physics . 2006,第5期

机译：诊断能量色散X射线光谱中CZT检测器响应的分析模型。
2. Low-energy shelf response in thin energy-dispersive X-ray detectors from Compton scattering of hard X-rays [J] . N. Michel-Hart, W.T. Elam Nuclear Instruments & Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment . 2017,第auga11期

机译：硬X射线的康普顿散射在薄型能量分散X射线探测器中的低能量货架响应
3. Mercuric iodide detector systems for identifying substances by X-ray energy dispersive diffraction [J] . Iwanczyk J.S., Patt B.E. IEEE Transactions on Nuclear Science . 1995,第4期

机译：碘化汞检测器系统，用于通过X射线能量色散衍射识别物质
4. Cadmium telluride detector system for identifying illicit substances by x-ray energy dispersive diffraction [C] . J. S. Iwanczyk, E. Nygard, D. Koscicsza IEEE Nuclear Science Symposium and Medical Imaging Conference . 2014

机译：碲化镉检测器系统，用于通过X射线能量色散衍射识别非法物质
5. Energy dispersive x-ray diffraction system for breast tissue characterization. [D] . Boileau, Michel M. 2006

机译：用于乳腺组织表征的能量色散X射线衍射系统。
6. Single-shot full strain tensor determination with microbeam X-ray Laue diffraction and a two-dimensional energy-dispersive detector [O] . A. Abboud, C. Kirchlechner, J. Keckes, -1

机译：微束X射线Laue衍射和二维能量色散检测器确定单次全应变张量
7. Small-Angle X-Ray Scattering (SAXS), Ultra-Small Angle X-Ray Scattering (USAXS), Fluctuation X-Ray Scattering (FXS), Wide-Angle X-Ray Scattering (WAXS), Grazing-Incidence Small-Angle X-Ray Scattering (GISAXS), Grazing-Incidence Wide-Angle X-Ray Scattering (GIWAXS), Small-Angle Neutron Scattering (SANS), Grazing-Incidence Small-Angle Neutron Scattering (GISANS), X-Ray Diffraction (XRD), Powder X-Ray Diffraction (PXRD), Wide-Angle X-Ray Diffraction (WAXD), Grazing- Incidence X-Ray Diffraction (GIXD) and Energy-Dispersive X-Ray Diffraction (EDXRD) Comparative Study on Malignant and Benign Human Cancer Cells and Tissues under Synchrotron Radiation [O] . Alireza Heidari 2017

机译：小角X射线散射（萨克斯），超小角X射线散射（USAX），波动X射线散射（FXS），广角X射线散射（蜡），放牧发生小角度x - 射线散射（吉即），放牧入射广角X射线散射（Giwaxs），小角度中子散射（SAN），放牧发生小角度中子散射（Gisans），X射线衍射（XRD），粉末X射线衍射（PXRD），广角X射线衍射（WAXD），放牧发病X射线衍射（GIXD）和能量分散X射线衍射（EDXRD）对恶性和良性人体癌细胞的比较研究和同步辐射下的组织

Energy dispersive x-ray diffraction system: A response function for the CZT detector and an analysis of noise at low momentum transfer arguments.

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