Method for measuring spectrum and accumulated dose of neutrons by utilizing passive detector

A technique of accumulating dose and detector, which is applied in the field of measuring neutron energy spectrum and accumulating dose by using passive detectors, which can solve the problem that the measurement results of unknown energy neutrons have large uncertainty and cannot obtain incident neutron energy information, and the measurement method It can achieve the effect of light weight, strong adaptability and convenient use

Active Publication Date: 2013-02-13
CHINA INST FOR RADIATION PROTECTION
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Problems solved by technology

[0008] However, although the existing active neutron dose measurement methods and instruments (such as the energy spectrum type single-sphere multi-detector neutron measurement system developed by the China Radiation Institute) can obtain incident neutron energy information, they lack power supply Or in the case of some serious nuclear accidents, this measurement method and instrument can not or is difficult t

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  • Method for measuring spectrum and accumulated dose of neutrons by utilizing passive detector
  • Method for measuring spectrum and accumulated dose of neutrons by utilizing passive detector
  • Method for measuring spectrum and accumulated dose of neutrons by utilizing passive detector

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[0024] The present invention will be further described below in conjunction with the drawings and specific embodiments.

[0025] Such as figure 1 As shown, the moderator probe used in the measurement method of the present invention includes a moderator sphere 2, and the detector is installed in the moderator sphere 2. Specifically, the detector is first encapsulated in the stainless steel tube 1, and then the three stainless steel tubes 1 with the detector are inserted into the moderating sphere 2 in a two-by-two vertical manner to obtain the moderation used in the measurement method of the present invention. Body probe.

[0026] The detector used in the measurement method of the present invention can be a thermoluminescence (TLD) detector, a bubble chamber detector or a CR-39 solid nuclear track detector. The most widely used LiF (Mg, Cu, P) thermal The luminescence detector is taken as an example to illustrate the method for measuring neutron energy spectrum and cumulative dose ...

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Abstract

The invention relates to a method for measuring the spectrum and accumulated dose of neutrons by utilizing a passive detector. According to the method, a moderator probe is used for measuring a neutron dose in a radiation field; and when data are processed, the energy of incident neutrons is calculated on the basis of different moderation distances experienced by the neutrons incident to each detector, a count measured by each detector is converted into the accumulated fluence of the neutrons, spectrum unscrambling software is used for obtaining the actual fluence spectrum of the incident neutrons, and the accumulated dose of the neutrons is calculated according to the actual fluence of the incident neutrons. According to the measurement method, the supply of power is not required during measurement; the method is high in environmental adaptability, low in cost and convenient to use; and in addition, the energy information of the neutrons can be acquired by the method, uncertainty about measurement results is lower than that of the conventional passive neutron measurement method, and the method can be widely applied to the neutron dose monitoring work of nuclear accident emergencies and environments.

Description

Technical field [0001] The invention belongs to the technical field of neutron detection, and specifically relates to a method for measuring neutron energy spectrum and accumulated dose by using a passive detector. Background technique [0002] Since the discovery of neutrons by J.chadwike in 1932, people have understood the basic composition of the nucleus. In less than eighty years until now, nuclear science and technology have been widely used in various fields such as industry, agriculture, medicine, and national defense, and have shown broad application prospects. The development and utilization of atomic energy science and technology have solved or is solving many difficulties facing human survival and development. However, due to the loss of ionizing radiation to the human body, this has also brought some direct or potential harm to our door. Therefore, the necessary protection is very important, and the protection of neutrons is crucial. [0003] Since the neutron itself ...

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Application Information

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IPC IPC(8): G01T3/00
Inventor 刘建忠王勇姚晓丽
Owner CHINA INST FOR RADIATION PROTECTION
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