238 U fission ionization chamber for measuring 20MeV energy zone neutron fluence rate

Abstract

The invention discloses a <238>U fission chamber used for measuring the neutron fluence rate of a 20MeV energy region. The invention takes the shape of a cylinder and comprises a shell (1) which is provided with an air inlet (2) and an air outlet (3), a bottom liner (5) which is electroplated with a <238>U sample (8), and a collector (6), wherein, the bottom liner (5) and the collector (6) are fixed inside the shell (1) through a strut (7); the bottom liner (5) is connected with the shell (1) and is taken as a cathode; the collector (6) is taken as an anode; signals which are collected by the collector (6) are transmitted by a signal output plug (9); the bottom liner (5) is made of stainless steels. The invention provides the <238>U fission chamber used for measuring the neutron fluence rate of the 20MeV energy region, along with a simple structure, low cost and capability of being conveniently modulated according to measuring requirements.

Description

technical field

[0001] The invention relates to an ionization chamber device for measuring radiation intensity, in particular to an ionization chamber device for measuring neutron fluence rate in the 20MeV energy region 238 U fission ionization chamber. Background technique

[0002] The neutron fluence rate is one of the basic quantities of the neutron field, from which other parameters can be prepared, such as the neutron cross section, the response of the detector, etc. The hydrogen recoil method is the most widely used method for measuring the fast neutron fluence rate, and different forms of recoil proton detectors are selected according to different energy regions. Currently, recoil proton telescopes and fission ionization chambers are commonly used in the world to measure the neutron fluence rate in the energy region above 20 MeV. For the recoil proton telescope, its measurement uncertainty is small, but because it is sensitive to gamma rays, coin...

Examples

Embodiment Construction

[0010] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0011] The device has a columnar structure, including a shell 1 with an inner diameter of 170mm and a front and rear wall thickness of 1.1mm. The shell 1 is welded with an air inlet 2 and an air outlet 3, and a stainless steel substrate 5 with a diameter of 150mm and a thickness of 0.4mm. And the collector 6 with a diameter of 150 mm and a thickness of 0.3 mm is fixed inside the shell 1 through a stainless steel fixing ring 4 and a pillar 7 composed of a polytetrafluoroethylene rod and a sleeve, and the stainless steel bottom lining 5 and the shell 1 are connected through a brass sleeve The tube is connected as the cathode, and the collector 6 is insulated from the shell 1 through the polytetrafluoroethylene sleeve and used as the anode. 238 The U sample 8 is electroplated on the substrate 5 , and the signal collected by the collector 6 is trans...

technical field

[0001] The invention relates to an ionization chamber device for measuring radiation intensity, in particular to an ionization chamber device for measuring neutron fluence rate in the 20MeV energy region 238 U fission ionization chamber. Background technique

[0002] The neutron fluence rate is one of the basic quantities of the neutron field, from which other parameters can be prepared, such as the neutron cross section, the response of the detector, etc. The hydrogen recoil method is the most widely used method for measuring the fast neutron fluence rate, and different forms of recoil proton detectors are selected according to different energy regions. Currently, recoil proton telescopes and fission ionization chambers are commonly used in the world to measure the neutron fluence rate in the energy region above 20 MeV. For the recoil proton telescope, its measurement uncertainty is small, but because it is sensitive to gamma rays, coin...

Examples

Embodiment Construction

[0010] Below in conjunction with accompanying drawing and specific embodiment the present invention is described in further detail:

[0011] The device has a columnar structure, including a shell 1 with an inner diameter of 170mm and a front and rear wall thickness of 1.1mm. The shell 1 is welded with an air inlet 2 and an air outlet 3, and a stainless steel substrate 5 with a diameter of 150mm and a thickness of 0.4mm. And the collector 6 with a diameter of 150 mm and a thickness of 0.3 mm is fixed inside the shell 1 through a stainless steel fixing ring 4 and a pillar 7 composed of a polytetrafluoroethylene rod and a sleeve, and the stainless steel bottom lining 5 and the shell 1 are connected through a brass sleeve The tube is connected as the cathode, and the collector 6 is insulated from the shell 1 through the polytetrafluoroethylene sleeve and used as the anode. 238 The U sample 8 is electroplated on the substrate 5 , and the signal collected by the collector 6 is trans...

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