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相关概念视频

Atomic Emission Spectroscopy: Overview01:20

Atomic Emission Spectroscopy: Overview

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Atomic emission spectroscopy (AES) is an analytical technique used to determine the elemental composition of a sample by analyzing the light emitted from excited atoms. In AES, atoms in a sample are excited to higher energy levels by thermal energy from high-temperature sources, such as plasma, arcs, or sparks. When these excited atoms return to lower energy states, they emit light at specific wavelengths characteristic of each element. The resulting atomic emission spectrum, which consists of...
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Atomic Radii and Effective Nuclear Charge03:08

Atomic Radii and Effective Nuclear Charge

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The elements in groups of the periodic table exhibit similar chemical behavior. This similarity occurs because the members of a group have the same number and distribution of electrons in their valence shells.
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Quantitative Analysis01:12

Quantitative Analysis

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Quantitative analysis is a technique for measuring the amount of specific constituents in a sample. When the sample's composition is unknown, qualitative analysis is performed first to identify its components, which ensures that the correct substances are measured during the quantitative phase.
In quantitative analysis, two key measurements are made: the sample quantity and a property proportional to the amount of the analyte (the substance being analyzed). This forms the basis of the...
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Atomic Absorption Spectroscopy: Interference01:25

Atomic Absorption Spectroscopy: Interference

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Interference leads to systematic error in atomic absorption (AA) measurements by enhancing or diminishing the analytical signal or the background. These interferences can be grouped into three main categories: spectral interference, chemical interference, and physical interference.
Spectral interference occurs when signals from other elements or molecules overlap with the analyte signal, falsely elevating or masking the analyte's absorbance. This interference can be corrected using Zeeman,...
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Atomic Absorption Spectroscopy: Lab01:21

Atomic Absorption Spectroscopy: Lab

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For AAS measurements, samples must be introduced as clear solutions, often requiring extensive preliminary treatment to dissolve materials like soils, animal tissues, and minerals. Common methods for sample preparation include treatment with hot mineral acids, wet ashing, combustion in closed containers, high-temperature ashing, or fusion with reagents.
 Solutions containing organic solvents, such as low-molecular-mass alcohols, esters, or ketones, enhance absorbances by increasing...
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Radioactivity and Nuclear Equations03:18

Radioactivity and Nuclear Equations

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Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
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相关实验视频

Updated: Jul 23, 2025

Quantitative Atomic-Site Analysis of Functional Dopants/Point Defects in Crystalline Materials by Electron-Channeling-Enhanced Microanalysis
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技术说明:基于材料分解的有效原子数量定量方法的错误分析.

Li Chen1, Xu Ji1,2, Zhe Wang3,4

  • 1Laboratory of Image Science and Technology, the School of Computer Science and Engineering, Southeast University, Nanjing, China.

Medical physics
|July 17, 2023
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的系数校准-在-组方法,以提高使用X射线成像的有效原子数 (Zeff) 定量化的准确性. 与标准技术相比,拟议的方法显著减少了量化错误.

关键词:
有效的原子号是有效的原子号.材料的分解材料的分解频谱X射线成像成像技术

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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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In Situ Detection and Single Cell Quantification of Metal Oxide Nanoparticles Using Nuclear Microprobe Analysis
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Quantification of Hydrogen Concentrations in Surface and Interface Layers and Bulk Materials through Depth Profiling with Nuclear Reaction Analysis
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科学领域:

  • 材料科学 材料科学 材料科学
  • 物理 物理学 物理
  • 图像技术技术的成像技术

背景情况:

  • 有效的原子号 (Zeff) 量化对于材料识别至关重要.
  • 基于材料分解的光谱X射线成像依赖于X射线相互作用截面的近似值,影响Zeff的准确性.
  • 这些近似对泽夫量化误差的确切影响仍未得到充分研究.

研究的目的:

  • 进行基于材料分解的泽夫量化方法的错误分析.
  • 开发和验证一个系数校准在组方法,以提高建模准确度和减少Zeff量化误差.

主要方法:

  • 校准了交互截面系数 (m) 使用对数对应用于各种能量和泽夫范围.
  • 分析了使用不同基础材料组合的量化错误,用于6-20的Zeff材料.
  • 根据错误和分解系数比率之间的相关性,制定了系数校准在组中的策略.

主要成果:

  • 在X射线相互作用截面中的近似引入Zeff测量的可量化的错误.
  • 建议的分组系数校准方法实现了最低的平均误差 (0.169-0.254),与标准方法相比,误差减少了多达62.9%.
  • 在绝对误差和分解系数比率之间观察到强烈的相关性 (皮尔森r > 0.7),验证了分组策略.

结论:

  • 在X射线相互作用截面中的近似自然会导致Zeff量化中的错误,但错误分布表现出规律性.
  • 系数校准在组方法证明了卓越的建模准确性,并显著减少了Zeff量化错误.
  • 这种精细的方法为使用光谱X射线成像进行材料识别提供了更高的可靠性.