4πβ-γ coincidence measurement device and measurement method based on multi-wire proportional chamber

Abstract

The invention discloses a 4πβ-γ coincidence measuring device based on a multi-wire proportional chamber. The detector of the 4πβ multi-wire proportional chamber includes an upper cavity and a lower cavity; anode wires parallel to each other are arranged in the upper cavity and the lower cavity; The γ channel signal is mixed and processed by the γ detection branch and sent to the coincidence circuit and the counter; the β channel signal detected by the 4πβ multi-wire proportional chamber detector is processed by the β detection branch; the processed γ channel signal and the processed β channel After the signals match, a match signal is generated and sent to the counter; the counter counts, and the processing unit obtains the radioactive activity value of the radioactive source. The invention also discloses a 4πβ-γ coincidence measurement method based on the multi-wire proportional chamber. The invention utilizes the self-designed 4πβ multi-filament proportional chamber detector, which can effectively reduce the source difficulty of 4πβ-γ consistent measurement of the absolute measurement method of radioactivity, and can directly measure the radioactivity of radioactive sources such as planar sources value.

Description

technical field [0001] The invention relates to the fields of nuclear radiation detection and ionizing radiation measurement, in particular to a 4πβ-γ coincidence measurement device and measurement method based on a multi-wire proportional chamber. Background technique [0002] The 4πβ-γ coincidence measurement method is an absolute measurement method for measuring radioactivity. Because this method adopts coincidence technology, it has extremely high accuracy for most β-γ nuclides, so the main metrology institutions (National Metrology Institutes, NIMs) in each country have established corresponding 4πβ-γ coincidence measurement devices, And use it as a reference device for radioactivity measurement in a country. The 4πβ-γ coincidence measurement device contains two types of detectors, respectively detecting two types of radioactive particles emitted during the same decay process. Among them, the detector used to detect β particles is called a β detector, and the detector...

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is that the existing 4πβ-γ coincidence measurement method cannot directly measure the radioactivity of a large area radioactive source, and the purpose is to provide a 4πβ-γ coincidence measurement device and measurement method based on a multi-filament proportional chamber to solve the above question

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