Two-pi multi-wire gas-flow proportional counter

Abstract

The invention belongs to the technical field of dosage measurement, and discloses a two-pi multi-wire gas-flow proportional counter. The counter is of a plate-type drawer structure and mainly comprises a counter shell, anode wires, an anode wire frame, insulation frameworks and a source drawer, wherein the counter shell is a square frame composed of an upper cover plate and shell side walls, the source drawer goes into and out of the counter shell through a guide rail, each shell side wall is provided with an air inlet and an air outlet, the anode wire frame is a square frame and is located between the upper insulation framework and the lower insulation framework, the lower insulation framework is fixed to the shell side walls, the upper insulation framework is located below the upper cover plate, the edges of the upper portions of the shell side walls are provided with a sealing ring, the upper cover plate is fixedly connected with the shell side walls, the anode wires are fixed to the anode wire frame, and the anode wires are gold-plated tungsten wires distributed at equal intervals in parallel. The counter has the advantages that the effective detection area is as large as 1000 square centimeters, the anode wires are distributed in parallel, gas disturbance is little, and electric fields are uniformly distributed.

Description

technical field [0001] The invention belongs to the technical field of dose measurement, and in particular relates to a 2π multi-wire gas flow proportional counter. Background technique [0002] The effective detection area of ​​existing surface pollution instruments used in nuclear accidents, nuclear facility decommissioning and other places is greater than 150cm 2 , some even as high as 1000cm 2 . In order to calibrate or periodically calibrate such α, β surface contamination meters, 2π multi-wire gas flow proportional counters are usually used to measure the surface emissivity of large-area α, β standard sources. [0003] There are two kinds of 2π multi-wire gas flow proportional counters commonly used at home and abroad, cylindrical and flat. Among them, the anode of the counter is mostly a metal filament, and the design of the cathode has various types, such as the Institute of Biophysics of the Chinese Academy of Sciences and the Chinese Engineering Physics Research ...

AI Technical Summary

Problems solved by technology

[0004] Due to the large effective detection area of ​​the 2π multi-wire gas flow proportional counter, there are problems of uneven electric field, poor stability, and inaccurate surface emissivity measurement caused by inconsistent tension of the anode metal wires and non-parallel anode wires.

Therefore, the effective detection area of ​​the existing 2π multi-wire gas flow proportional counter is at most about 600-700cm 2 , can not effectively meet the requirement of active area up to 1000cm in on-site radiation monitoring and decommissioning of nuclear facilities 2 Accurate determination of surface emissivity of large-area α, β planar sources

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