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

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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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 to apply; and now commonly used passive neutron dose measurement methods, such as thermoluminescence (TLD), nuclear track and other technologies, are mainly used for Recording the cumulative dose of neutrons cannot obtain the energy information of incident neutrons, so the measurement results of unknown energy neutrons have a large uncertainty, which cannot meet the needs of radiation protection monitoring work

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