Method for measuring neutron dose rate by means of cerium bromide detector and neutron dose instrument

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

Active Publication Date: 2018-06-05
TSINGHUA UNIV
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Problems solved by technology

However, the above-mentioned detection method is based on the time-of-flight method, which is not applicable to the field of radiation protection: because the time-of-flight method is based on the fact that neutrons of different energies (flight velocities) fly over a certain distance, the required time is different, and the measurement of neutron energy Conve

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  • Method for measuring neutron dose rate by means of cerium bromide detector and neutron dose instrument
  • Method for measuring neutron dose rate by means of cerium bromide detector and neutron dose instrument
  • Method for measuring neutron dose rate by means of cerium bromide detector and neutron dose 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 cerium bromide detector, and the cerium bromide detector adopts a 2in×2in cerium bromide detector (CeBr 3 ). 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 cerium 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 4 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 To measure the gamma energy spectrum detected by the neutron dose rate instrument at different neutron dose rates, the neutron dos...

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Abstract

The invention discloses a method for measuring neutron dose rate by means of a cerium bromide detector and a neutron dose instrument, wherein according to the method for measuring the neutron dose rate, a deterministic function relation between a net counting rate of a neutron characteristic gamma energy peak which is generated by the neutron in the cerium bromide detector and the neutron dose rate which is caused by the neutron at the point, through measuring the gamma energy spectrum and using the deterministic function relation, the neutron dose rate is calculated and obtained. Therefore, the method for measuring the neutron dose rate according to the embodiment of the invention can acquire the neutron dose rate more conveniently, quickly and 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 cerium 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 boron-...

Claims

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Application Information

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IPC IPC(8): G01T3/00G01T1/02
Inventor 曾志曾鸣马豪李君利张辉
Owner TSINGHUA UNIV
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