Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

845
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,...
845
Nuclear Power02:36

Nuclear Power

7.7K
Controlled nuclear fission reactions are used to generate electricity. Any nuclear reactor that produces power via the fission of uranium or plutonium by bombardment with neutrons has six components: nuclear fuel consisting of fissionable material, a nuclear moderator, a neutron source, control rods, reactor coolant, and a shield and containment system.
Nuclear Fuels
Nuclear fuel consists of a fissile isotope, such as uranium-235, which must be present in sufficient quantity to provide a...
7.7K
Biological Effects of Radiation02:59

Biological Effects of Radiation

15.4K
All radioactive nuclides emit high-energy particles or electromagnetic waves. When this radiation encounters living cells, it can cause heating, break chemical bonds, or ionize molecules. The most serious biological damage results when these radioactive emissions fragment or ionize molecules. For example, α and β particles emitted from nuclear decay reactions possess much higher energies than ordinary chemical bond energies. When these particles strike and penetrate matter, they...
15.4K
Types of Radioactivity03:23

Types of Radioactivity

16.7K
The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:
16.7K
Absorption of Radiation01:05

Absorption of Radiation

712
The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
712
Atomic Emission Spectroscopy: Interference01:30

Atomic Emission Spectroscopy: Interference

176
In atomic emission spectroscopy (AES), high-temperature atomizers excite a broad range of elements and molecules that generate complex emissions from sources such as oxides, hydroxides, and flame combustion products in the flame or plasma. Several strategies can be employed to minimize spectral interferences caused by overlapping emission lines or bands. These include increasing instrument resolution, choosing alternative emission lines, optimally placing the detector in low-background regions,...
176

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Transgene-free plant genome editing via viral delivery of miniature CRISPR-Cas12f.

Functional & integrative genomics·2026
Same author

Engineering the bacterial nutrition strategy to control plant diseases.

Journal of integrative plant biology·2026
Same author

Evaluation of radioactivity levels and lifetime cancer risk assessment in drinking water of Dera Ghazi Khan, Pakistan.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same author

Understanding the genetics of cotton regeneration to help improve cotton.

Trends in plant science·2025
Same author

Impact of Ultraviolet-A (UV-A) radiation on antioxidant enzyme activity in Loxostege sticticalis (Lepidoptera: Pyralidae).

Journal of economic entomology·2025
Same author

A comprehensive water buffalo pangenome reveals extensive structural variation linked to population-specific signatures of selection.

GigaScience·2025
Same journal

Radiological performance of cemented FMA-VC radioactive waste packages for transport: A PHITS Monte Carlo study.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Investigating the relationship between naturally occurring radionuclides and grain size of sediment from the Helskloof Basin, South Africa.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Computational benchmarking of tellurite glasses for photon and fast-neutron radiation shielding.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Proton-beam profiling using radiophotoluminescent glass-based hybrid radiation monitoring system.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

Hydrogeochemical investigation of uranium and radon in groundwater and age-dependent radiological health risk assessment in Sulaymaniyah Governorate, Iraq.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
Same journal

High-accuracy prediction of Kβ/Kα intensity ratios via explainable stacked-ensemble learning: A web-based computational tool.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2026
查看所有相关文章

相关实验视频

Updated: Jun 17, 2025

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
06:43

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Published on: May 2, 2018

7.0K

使用附加的蒙特卡洛方法估计背景放射性水平和被动屏蔽优化.

Khizar Hayat Satti1, Muhammad Dilband2, Muhammad Tariq Siddique3

  • 1Department of Physics and Applied Mathematics, Pakistan Institute of Engineering and Applied Sciences, Islamabad, Pakistan; Health Physics Division, Pakistan Institute of Nuclear Science and Technology, P.O Nilore, Islamabad, Pakistan.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine
|August 14, 2024
PubMed
概括
此摘要是机器生成的。

本研究引入了附加的蒙特卡洛模拟,用于估计自然放射性核酸活性和优化HPGe探测器屏蔽. 12厘米的盾显著减少了背景辐射,确保了安全.

关键词:
附加蒙特卡洛模拟的模拟.环境中的放射性环境.在FEPE中,FEPE是FEPE.吉安特4的情况是这样的危害健康的健康风险屏蔽优化保护的优化.

更多相关视频

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
08:53

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

Published on: June 6, 2018

8.0K
Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
05:56

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies

Published on: November 6, 2018

8.1K

相关实验视频

Last Updated: Jun 17, 2025

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band
06:43

Effective Analysis of Human Exposure Conditions with Body-worn Dosimeters in the 2.4 GHz Band

Published on: May 2, 2018

7.0K
Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level
08:53

Automated 90Sr Separation and Preconcentration in a Lab-on-Valve System at Ppq Level

Published on: June 6, 2018

8.0K
Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies
05:56

Construction of a Compact Low-Cost Radiation Shield for Air-Temperature Sensors in Ecological Field Studies

Published on: November 6, 2018

8.1K

科学领域:

  • 核物理 核物理 核物理
  • 辐射检测和测量 辐射检测和测量
  • 计算物理 计算物理

背景情况:

  • 高纯度 (HPGe) 探测器对于辐射分析至关重要.
  • 估计自然放射性核酸活性和优化屏蔽对于准确的测量至关重要.
  • 被动屏蔽对于减少HPGe探测器系统的背景噪声至关重要.

研究的目的:

  • 开发和验证一种使用附加蒙特卡洛 (MC) 模拟来估计自然放射性核素活性度的程序.
  • 为了优化HPGe探测器的被动屏蔽解决方案.
  • 评估建筑材料和屏蔽中与自然放射性相关的放射性风险.

主要方法:

  • 首次采用Geant4助理MC模拟技术,用于HPGe探测器屏蔽优化和放射性核酸活性估计.
  • 获得的背景光谱与没有屏蔽,以确定放射性核酸度.
  • 通过对各种点源的计算和测量全能峰值效率 (FEPE) 进行比较,验证了探测器设计.

主要成果:

  • 在建筑材料中确定了40K,226Ra和232Th的活性度 (例如,40K的524±140 Bqkg-1).
  • 在屏蔽中测量了天然放射性水平 (例如,155.7 ± 0.1 mBqkg-1为40K).
  • 12厘米的最佳盾厚度被发现可以减少两个数量级的背景;所有放射性参数都在安全范围内.

结论:

  • 在Geant4中辅助MC模拟为背景辐射分析和HPGe探测器屏蔽优化提供了快速可行的解决方案.
  • 在实验室中使用的建筑材料在放射学上是安全的.
  • 开发的程序有效地估计了自然的放射性核酸活性,并优化了屏蔽,提高了探测器的性能.