New positron lifetime spectrometer with the coincidence of energy selected positron and the annihilation photon

新型正电子寿命谱仪,能量选择正电子与湮没光子重合

基本信息

项目摘要

In order to achieve in-situ studies of condensed matter under extremeconditions, new beta^+-gamma conicidence lifetime spectrometer with the coincidence of energy-selected positron and the annihilation photon has been constructed. The whole apparatus is desk-top and low cost, since it does not need any accelerators but a small sealed positron-source and a pair of magnetic lenses. Specimens can be exposed to any extreme surrounding conditions without the risk of contamination by radioactive materials, since the specimen part is independent and well-separated from the sealed positron-source. In order to overcome the inevitable deterioration of time resolution due to the spread of TOF (time of flight) of positrons emitted from radioisotopes, positrons in a certain energy band are selected using magnetic field. The total efficiency (more than 10^<-3> of positrons from the source can be focused on a specimen) is much superior to that expected for the case of re-acceleration of moderated positrons. The time resolution of the whole system with a 10mCi^<22> Na positron source is about 385ps (FWHM) as yet, which is worse than that of the conventional gamma-gamma coincidence method (around 200ps FWHM typically) but bears comparison with former beta^+-gamma coincidence lifetime spectrometers using close geometry between the positron source and a specimen.
为了实现极端条件下凝聚态物质的原位研究,我们建造了新型的能量选择正电子与湮没光子符合的β ^+-γ符合寿命谱仪。整个装置不需要加速器,只需要一个小型密封正电子源和一对磁透镜,是台式的,成本低。样品可以暴露在任何极端的环境条件下,而没有被放射性物质污染的风险,因为样品部分是独立的,与密封的正电子源分离良好。为了克服由于放射性同位素发射的正电子的飞行时间(TOF)的扩展而导致的时间分辨率的不可避免的劣化,使用磁场来选择特定能带中的正电子。总的效率(超过10^<-3>的正电子从源可以集中在一个标本)是上级的情况下,预期的再加速慢化正电子。采用10 mCi ^ Na正电子源的整个系统的时间分辨率<22>约为385 ps(FWHM),比传统的γ-γ符合方法(FWHM约为200 ps)要差,但可以与正电子源和样品之间采用紧密几何结构的β ^+-γ符合寿命谱仪相比较。

项目成果

期刊论文数量(1)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Yasuharu Shirai: "Construction of Positron-Beam Apparatus for In-Situ Studies of Lattice Defects in Materials" The PRODUCTION & TECHNIQUE. Vol.48, No.4. 50-52 (1996)
Yasuharu Shirai:“用于材料晶格缺陷原位研究的正电子束装置的构建”
  • DOI:
  • 发表时间:
  • 期刊:
  • 影响因子:
    0
  • 作者:
  • 通讯作者:
{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

数据更新时间:{{ journalArticles.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ monograph.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ sciAawards.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ conferencePapers.updateTime }}

{{ item.title }}
  • 作者:
    {{ item.author }}

数据更新时间:{{ patent.updateTime }}

SHIRAI Yasuharu其他文献

SHIRAI Yasuharu的其他文献

{{ item.title }}
{{ item.translation_title }}
  • DOI:
    {{ item.doi }}
  • 发表时间:
    {{ item.publish_year }}
  • 期刊:
  • 影响因子:
    {{ item.factor }}
  • 作者:
    {{ item.authors }}
  • 通讯作者:
    {{ item.author }}

{{ truncateString('SHIRAI Yasuharu', 18)}}的其他基金

"Transformation - Induced Vacancy" - A New Vacancy Formation Mechanism and Its Function in Materials -
“相变-诱导空位”-一种新的空位形成机制及其在材料中的作用-
  • 批准号:
    24246105
  • 财政年份:
    2012
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
Construction of a non-destructive evaluation system of materials in use by using positrons
利用正电子构建在用材料无损评价系统
  • 批准号:
    14350370
  • 财政年份:
    2002
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Construction of a desk-top-sized and mobile positron lifetime spectrometer with β^<+->γ coincidence and positron energy selection for in-situ studies of lattice defects
构建具有β^<+->γ符合和正电子能量选择的台式移动正电子寿命谱仪,用于晶格缺陷的原位研究
  • 批准号:
    10555212
  • 财政年份:
    1998
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Constitutional and/or Thermal Vacancies in some Intermetallic Compounds
某些金属间化合物中的结构空位和/或热空位
  • 批准号:
    08455289
  • 财政年份:
    1996
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Construction of a Positron Lifetime Spectrometer with beta^+-gamma coincidence for in-situ studies of lattice Defect
构建用于晶格缺陷原位研究的β^-γ符合的正电子寿命谱仪
  • 批准号:
    05555167
  • 财政年份:
    1993
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Study of Point Defects in B2-type Ordered Alloys by Means of Positron Annihilation
正电子湮灭研究B2型有序合金点缺陷
  • 批准号:
    61550480
  • 财政年份:
    1986
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Nucleation Process of Voids Studied by Positron Lifetime Spectroscopy
正电子寿命谱研究空洞成核过程
  • 批准号:
    60550459
  • 财政年份:
    1985
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)

相似海外基金

Proposal of "Quantum PET" and sensing of radiotherapy effect by positron lifetime
“量子PET”提案和通过正电子寿命感知放射治疗效果
  • 批准号:
    22K12881
  • 财政年份:
    2022
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Correlation between physical properties of amorphous materials and the cavity calculated by positron lifetime measurement
通过正电子寿命测量计算非晶材料物理性质与腔体的相关性
  • 批准号:
    22H01785
  • 财政年份:
    2022
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
Operando analysis of deformed polymer materials by positron lifetime measurement
通过正电子寿命测量对变形聚合物材料进行操作分析
  • 批准号:
    17K05123
  • 财政年份:
    2017
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Positron lifetime study on vacancy behavior in bcc-base intermetallics
BCC基金属间化合物空位行为的正电子寿命研究
  • 批准号:
    18560644
  • 财政年份:
    2006
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
Construction of a desk-top-sized and mobile positron lifetime spectrometer with β^<+->γ coincidence and positron energy selection for in-situ studies of lattice defects
构建具有β^<+->γ符合和正电子能量选择的台式移动正电子寿命谱仪,用于晶格缺陷的原位研究
  • 批准号:
    10555212
  • 财政年份:
    1998
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (B)
STRUCTURE AND NATURE OF VERY SMALL POINT DEFECT CLUSTERS STUDIES BY POSITRON LIFETIME AND TRANSMISSION ELECTRON MICROSCOPE
极小点缺陷簇的结构和性质的正电子寿命和透射电子显微镜研究
  • 批准号:
    10650650
  • 财政年份:
    1998
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (C)
A Study on Guiding Principles to Predict the Properties of Hydrogen Absorbing Compounds with Emphasis on Their Positron Lifetime
以正电子寿命预测吸氢化合物性质的指导原则研究
  • 批准号:
    08555162
  • 财政年份:
    1996
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Scientific Research (A)
A Study of a Positron Lifetime in a Rare Gas Adsobed on a HOPG Surface
HOPG表面吸附稀有气体正电子寿命的研究
  • 批准号:
    06640516
  • 财政年份:
    1994
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
Construction of a Positron Lifetime Spectrometer with beta^+-gamma coincidence for in-situ studies of lattice Defect
构建用于晶格缺陷原位研究的β^-γ符合的正电子寿命谱仪
  • 批准号:
    05555167
  • 财政年份:
    1993
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for Developmental Scientific Research (B)
Positron lifetime study of dislocations in metals
金属位错的正电子寿命研究
  • 批准号:
    02805079
  • 财政年份:
    1990
  • 资助金额:
    $ 5.57万
  • 项目类别:
    Grant-in-Aid for General Scientific Research (C)
{{ showInfoDetail.title }}

作者:{{ showInfoDetail.author }}

知道了