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相关概念视频

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

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An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
848
Scanning Electron Microscopy01:07

Scanning Electron Microscopy

4.2K
A scanning electron microscope (SEM) is used to study the surface features of a sample by using an electron beam that scans the sample surface in a two-dimensional manner. Typically, areas between ~1 centimeter to 5 micrometers in width can be imaged. SEM can be used to image bacteria, viruses, tissues as well as larger samples like insects. Conventional SEM gives a magnification ranging from 20X to 30,000X and spatial resolution of 50 to 100 nanometers.
Fundamental Principles
Accelerated...
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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
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Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies

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集装箱扫描仪的屏蔽设计和评估方法.

Thokchom D Singh1, Rajib L Sha1, Ranjankumar K Singh1

  • 1Radiation Applications Safety Division, Atomic Energy Regulatory Board, Anushaktinagar-400094, Mumbai, India.

Radiation protection dosimetry
|July 17, 2024
PubMed
概括

集装箱扫描仪中的高能光子束需要仔细的生物屏蔽来保护公众和工人. 本研究开发了一种设计和评估这些装置的屏蔽方法,以确保辐射安全.

科学领域:

  • 医学物理 医学物理
  • 辐射保护 辐射保护
  • 图像技术技术的成像技术

背景情况:

  • 越来越多地使用高能光子束 (6-9 MV) 进行容器扫描.
  • 需要确保辐射水平在公众和工人安全的允许剂量范围内.

研究的目的:

  • 为集装箱扫描仪装置的屏蔽设计和评估制定一种方法.
  • 解决高能X射线系统生物屏蔽方面的挑战.

主要方法:

  • 引用了NCRP/IAEA对放射治疗的屏蔽评估概念.
  • 根据工作负载计算出优化的屏蔽厚度 (扫描容器,机器启动时间,剂量率).
  • 考虑了光束堵塞和从扫描材料中的散射.

主要成果:

  • 开发了容器扫描仪安装的模型布局计划.
  • 建立了一种评估墙壁和天花板屏蔽的方法.
  • 为9MV集装箱扫描仪设计安全结构室提供了基本要求.

结论:

  • 有效的屏蔽设计对于集装箱扫描仪装置的辐射安全至关重要.
  • 拟议的方法确保符合辐射保护标准.

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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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Radiotracer Administration for High Temporal Resolution Positron Emission Tomography of the Human Brain: Application to FDG-fPET
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Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
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Radiotracer Administration for High Temporal Resolution Positron Emission Tomography of the Human Brain: Application to FDG-fPET
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Radiotracer Administration for High Temporal Resolution Positron Emission Tomography of the Human Brain: Application to FDG-fPET

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  • 优化的屏蔽设计将辐射暴露风险降至最低.