Proportional counter
A technology of proportional counter and cathode, which is applied in the direction of instrumentation and radiation measurement, etc., can solve the problems of no response, inability to apply pulsed radiation field, large deviation, etc., and achieve the effect of avoiding accumulation and blockage
Pending Publication Date: 2022-05-13
CHINA INSTITUTE OF ATOMIC ENERGY
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Problems solved by technology
[0005] In order to solve the problem of conventional proportional counters in the measurement of pulsed radiation fields, the actual output pulse signal amplitude and counting rate are caused by the phenomenon of space charge effect on the anode wire, pulse accumulation and back-end nuclear electronics readout circuit counting saturation or "blocking". Etc. and the phenomenon that expected deviation is bigger or non-responsive, the object of the present invention is to provide a kind of proportional counter that is used for X, gamma ray pulse radiation measurement in current mode, this proportional counter output current or total electric quantity is directly proportional to radiation Field strength, through the measurement of output current or total charge, can not only be applied to conventional X, γ-ray continuous radiation measurement, but also can be used for X, γ-ray pulsed radiation measurement, which solves the problem that conventional proportional counters cannot be applied to pulsed radiation fields the puzzle
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[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.
[0023] like figure 2 As shown, a proportional counter provided by the present invention is used for X or γ-ray pulse radiation measurement, which includes a cylindrical sealed cathode casing 3 arranged in a sealed shielding casing 6. The anode wire 1 set at the axis position, one end of the cathode casing 3 is set with a signal export interface 7, and the other end of the cathode casing 3 is set with a high voltage power supply input interface 8.
[0024] Insulators 5 are respectively provided at both ends of the cathode casing 3. The insulators 5 prevent the cathode casing 3 from contacting the shielding casing 6 to prevent contact conduction; the material of the insulator 5 includes high insulating materials such as polytetrafluoroethylene, nylon or PEEK. .
[0025] The cathode casing 3 is filled with the working gas 2, a first insulating terminal 4 ...
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The invention belongs to the technical field of radiation dose measurement, and particularly relates to a proportional counter which is used for X or gamma ray pulse radiation measurement and comprises a cylindrical sealed cathode shell (3) arranged in a sealed shielding shell (6), an anode wire (1) arranged at the axis position of the cathode shell (3) and a signal export interface (7) arranged at one end of the cathode shell (3). And the other end of the cathode shell (3) is provided with a high-voltage power supply input interface (8). A shielding shell (6) made of a metal material is grounded to form a non-interference electromagnetic shielding environment for the internal structure of the proportional counter, an anode wire (1) provides working positive high voltage, and a cathode shell (3) collects inductive charges during ionization and proportional multiplication charge drift and forms current signal output. The space charge effect and the pulse accumulation effect of a conventional proportional counter in high counting rate measurement and pulse radiation measurement scenes can be effectively avoided.
Description
technical field [0001] The invention belongs to the technical field of radiation dose measurement, in particular to a proportional counter. Background technique [0002] Proportional counter is a kind of gas nuclear radiation detector. Its working voltage is in the proportional region, which can be used for X, γ-ray measurement, and is widely used in radiation dose measurement, site radiation monitoring and other applications. [0003] The structure of the proportional counter is mostly cylindrical, the center is the anode filament, the cylindrical shell is the cathode, and the working gas is generally a mixture of inert gas and a small amount of negatively charged gas. The collision of the incident particles with the gas atoms in the cylinder ionizes the atoms, producing electrons and positive ions. Under the action of the electric field, the electrons move toward the central anode wire, and the positive ions drift toward the cathode at a much slower rate than the electron...
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IPC IPC(8): G01T7/00
CPCG01T7/00
Inventor 倪宁高飞陈义珍侯金兵徐阳王子琳陈飞
Owner CHINA INSTITUTE OF ATOMIC ENERGY