Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for measuring neutron energy spectrum of neutron radiation field by utilizing lanthanum bromide detector

A technology of lanthanum bromide and detector is applied in the field of measuring neutron energy spectrum of neutron radiation field by using lanthanum bromide detector, which can solve the problems such as inability to realize in the field of radiation protection.

Active Publication Date: 2019-04-23
TSINGHUA UNIV
View PDF6 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method requires extremely precise distance control, and accurately records the starting time and ending time of neutrons on the flight distance, and requires the help of other large instruments, which is obviously impossible in the field of radiation protection

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for measuring neutron energy spectrum of neutron radiation field by utilizing lanthanum bromide detector
  • Method for measuring neutron energy spectrum of neutron radiation field by utilizing lanthanum bromide detector
  • Method for measuring neutron energy spectrum of neutron radiation field by utilizing lanthanum bromide detector

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0063] Using 3in×3in lanthanum bromide detector (LaBr 3 :Ce), its basic structure is as figure 2 Shown; the neutron source selects the americium beryllium neutron source ( 241 Am-Be neutron source).

[0064] The specific implementation process is as follows:

[0065] 1) Place the lanthanum bromide detector on 241 The measurement is carried out in the neutron radiation field formed by the Am-Be neutron source, and the measured gamma energy spectrum is as follows image 3 shown. Select neutron and 79 Br, 81 Br and 139 The six characteristic gamma energy peaks produced by inelastic scattering of La were calculated by Gaussian fitting and linear background method, and the net counts of each gamma energy peak were listed in Table 1. The characteristic gamma energy peaks produced by inelastic scattering between the americium beryllium neutron source and the lanthanum bromide crystal include but are not limited to the above energy values.

[0066] 2) Calculate the value of ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for measuring a neutron energy spectrum of a neutron radiation field by utilizing a lanthanum bromide detector. The method comprises the following steps: (1), establishing energy distribution function relationship (as shown in the description), generated by inelastic scattering of neutrons and a detector, of a neutron characteristic gamma energy peak net count andneutron energy, wherein phi(Ei) is neutron fluence of an ith energy group of a to-be-tested neutron energy spectrum; N<j>ngamma is a net count, generated by inelastic scattering of the neutrons and <79>Br, <81>Br and <139>La, of a jth characteristic gamma energy peak E<j>ngamma; epsilon<j>gamma is intrinsic full-energy peak detection efficiency, generated by the detector to the inner part, of thejth characteristic gamma energy peak E<j>ngamma; sigma<k>j(Ei) is a reaction cross section, generated by a reaction of neutrons with energy as Ei and kth nuclide, of the jth characteristic gamma energy peak; N<k>j is nuclear number for the kth nuclide and the neutrons to generate a jth reaction in a crystal; and Pji(Ei) is probability that the ith energy group neutrons participate in the jth reaction; (2), establishing j kinds of response equations for obtained j kinds of neutron characteristic gamma energy peak and forming an equation set; (3), determining response functions of the neutron characteristic gamma energy peak to different energy neutrons Ei; and (4), analyzing the equation set.

Description

technical field [0001] The invention belongs to the technical fields of radiation detection and environmental monitoring, in particular to a method for measuring the neutron energy spectrum of a neutron radiation field by using a lanthanum bromide detector. Background technique [0002] Neutron energy spectrum data is one of the important parameters that need to be measured in basic nuclear physics research, reactor control, space particle detection, accelerator radiation field, and radiation protection design, and is an important content of neutron detection. [0003] According to different neutron source types and application purposes, neutron energy spectrum measurement methods can be roughly divided into two categories: one is to separate a specific energy single-energy neutron beam from the continuous energy spectrum neutron beam, and cooperate with multi-channel time analysis In order to obtain the energy distribution of neutron rays, the corresponding measurement meth...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/06
CPCG01T3/06
Inventor 曾志刘翠红李君利衣宏昌马豪张辉
Owner TSINGHUA UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com