Sampling type fission ionization chamber and fission total number measuring method based on same

Abstract

The invention relates to a fission ionization chamber, in particular to a sampling fission ionization chamber and a fission total number measuring method based on the same. The problems that when an existing ionization chamber is used for measuring the fission yield, due to the fact that the ionization chamber has self-shielding and is poor in neutron energy spectrum consistency, large measurementuncertainty is introduced, gas fission products and short-life fission products cannot be measured, and the influence on the health of measuring personnel is large are solved. The ionization chamberis characterized by comprising a cathode support, a cathode and an anode support, wherein the cathode support and the cathode are coaxially arranged in sequence from bottom to top, and the anode support is arranged in an inner cavity of the cathode and is coaxial with the cathode. An annular sealing boss and an isolation boss are arranged on the lower bottom surface of the anode support. The sealing boss is positioned on the outer side of the isolation boss. The lower end surface of the sealing boss is hermetically and fixedly connected with the bottom inner surface of the cathode. A gap is formed between the lowermost end of the isolation boss and the inner surface of the cathode bottom. The sampling anode and the annular anode are attached to the lower bottom surface of the anode support, and the sampling anode is located in the isolation boss. The annular anode is located between the isolation boss and the sealing boss.

Description

technical field [0001] The invention relates to a fission ionization chamber, in particular to a pumping type fission ionization chamber and a method for determining the total number of fissions based on the fission ionization chamber. Background technique [0002] The probability that nuclear materials such as uranium, plutonium, and neptunium undergo unit fission to produce fission product A is called the fission yield of A. Generally speaking, there are certain differences in the fission cross section and fission yield under different neutron fields. When developing advanced nuclear devices such as nuclear reactors, the relationship between fission yield and neutron energy is an important factor in the determination of fission burnup. Base. The determination of fission yield needs to measure the total amount of fission products and the total amount of fission of nuclear materials simultaneously. For the measurement of the total amount of fission products, beta measureme...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a pumping type fission ionization chamber and a method for measuring the total number of fissions based on it, so as to solve the problem of self-shielding and neutron energy spectrum consistency in the ionization chamber when the existing double-fission ionization chamber is used to measure the fission yield. , leading to the introduction of large measurement uncertainties, as well as the inability to measure gas fission products and short-lived fission products, and technical problems that have a greater impact on the health of measurement personnel

Images