Calibration device for thermal neutron fluence rate of nuclear reactor silicon single crystal irradiation tunnel

Abstract

The invention relates to a calibrating device for the thermal neutron fluence rate of a silicon single crystal irradiation channel of a nuclear reactor, which comprises an aluminum cylinder, one end of the aluminum cylinder is provided with a base, the other end is provided with a top cover, and the center of the top cover is provided with a through hole. There is a silicon single crystal rod in the aluminum cylinder, and a round hole is arranged on the axis of the silicon single crystal rod. The open end of the round hole is opposite to the through hole. The sensitive section of the micro-fission chamber is inserted into the bottom of the round hole, and the micro-fission The chamber is set in the fixed pipe, and the hoisting head is connected with the top cover through the connecting column, and the through hole I matched with the through hole is arranged on the axial direction of the connecting column. The present invention simulates the environment and conditions during silicon irradiation by adopting the clever combination of micro-fission chambers and silicon single crystal rods, and eliminates the state gap between the measurement method and the silicon to be irradiated. The thermal neutron fluence rate of the silicon irradiation hole can be measured timely and accurately at the part to be measured in the irradiation hole, which can be directly used in the irradiation production.

Description

technical field [0001] The invention relates to the technical field of neutron irradiation processing of nuclear reactors, in particular to a calibration device for thermal neutron fluence rate of silicon single crystal irradiation tunnels of nuclear reactors. Background technique [0002] Although the measurement of the thermal neutron fluence rate in the micro-fission chamber is a common technique, it is difficult to determine the consistency of the result with the fluence rate of the irradiated object due to various time and space differences such as conditions and shapes. Especially in the high-power reactor irradiation tunnel, it is more difficult to measure the irradiation time of the irradiated object by minutes. Therefore, high-quality radiation processing is required, and it has always been a difficult problem that the thermal neutron fluence rate measurement method can meet multiple requirements quickly, truly and easily. Contents of the invention [0003] The t...

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Problems solved by technology

[0003] The technical problem to be solved by the present invention is to provide a calibration device for the thermal neutron fluence rate of the silicon single crystal irradiation tunnel of a nuclear reactor, so as to overcome the inaccurate measurement results caused by the direct measurement of the thermal neutron fluence rate in the existing micro-fission chamber. Accurate, untimely issues

[0005] The existing measurement of the irradiated neutron fluence rate is directly measured by a miniature fission chamber. Because the thermal neutron fluence rate in the irradiated tunnel has many uncertainties and inconsistencies in time and space, it cannot be accurately measured. Measuring the thermal neutron fluence rate in the irradiated tunnel, it is even impossible to measure the neutron fluence rate when the silicon is irradiated

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