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Method of measuring neutron close rate by means of lanthanum bromide detector, and neutron close rate instrument

A technology of neutron dose and lanthanum bromide, applied in the field of environmental monitoring equipment and radiation detection, can solve the problems that cannot be realized

Active Publication Date: 2018-05-18
TSINGHUA UNIV
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Problems solved by technology

This method requires extremely precise recording of the starting and ending moments of the neutron flight distance, which is obviously impossible in the field of radiation protection

Method used

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  • Method of measuring neutron close rate by means of lanthanum bromide detector, and neutron close rate instrument
  • Method of measuring neutron close rate by means of lanthanum bromide detector, and neutron close rate instrument
  • Method of measuring neutron close rate by means of lanthanum bromide detector, and neutron close rate instrument

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Embodiment 1

[0056] The neutron dose rate is measured by a neutron dose rate meter. Among them, the neutron dose rate meter has a lanthanum bromide detector, and the lanthanum bromide detector adopts a 3in×3in lanthanum bromide detector (LaBr 3 : Ce). The californium source (Cf-252 source) was selected as the neutron source to be tested.

[0057] 252 The characteristic gamma energy peaks produced by the reaction of the Cf source with the lanthanum bromide crystal include but are not limited to the energy values ​​listed in Table 1; The net count rate and neutron dose rate of the gamma energy peak, the characteristic gamma energy peak includes but not limited to the five energies listed in Table 2.

[0058] The background spectrum and measurement obtained by neutron dose rate meter 252 The measurement spectrum obtained by the Cf source is as follows figure 1 shown; figure 2 In order to measure the gamma energy spectrum detected by the neutron dose rate instrument at different neutron...

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Abstract

The invention discloses a method of measuring the neutron close rate by means of a lanthanum bromide detector, and a neutron close rate instrument. The method of measuring the neutron close rate can calculate and obtain the neutron close rate by utilizing the function relationship having determinacy between the net counting rate of the neutron characteristic gamma energy barrier, of a neutron, generated in the lanthanum bromide detector and the neutron close rate, at the point, of the neutron, by measuring the gamma energy spectrum, and by utilizing the function relationship having determinacy. Therefore, the method of measuring the neutron close rate by means of a lanthanum bromide detector can obtain the neutron close rate more conveniently, more quickly and more accurately.

Description

technical field [0001] The invention belongs to the technical field of radiation detection and environmental monitoring equipment. Specifically, the invention relates to a method for measuring neutron dose rate using a lanthanum bromide detector and a neutron dose rate meter. Background technique [0002] A neutron dose rate meter is a radiation monitoring device used to measure and evaluate the surrounding dose equivalent rate produced by neutron radiation. At present, the basic components of common neutron dose rate meters for radiation protection include moderators, neutron energy compensation materials, thermal neutron sensitive counters and electronic circuits. Its structural feature is that the thermal neutron sensitive counter is wrapped in the center with a spherical or cylindrical moderator; in the moderator body, a neutron absorption sieve with slow neutron penetration holes is set at a certain distance from the central detector. Or use the absorption layer of bor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01T3/00
CPCG01T3/00
Inventor 曾志刘翠红李君利张辉曾鸣马豪
Owner TSINGHUA UNIV
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