4pibeta-gamma coincidence measurement device and method based on multi-wire proportional chamber

Abstract

The invention discloses a 4pibeta-gamma coincidence measurement device based on a multi-wire proportional chamber. A 4pibeta multi-wire proportional chamber detector comprises an upper cavity and a lower cavity; anode wires which are parallel to each other are arranged in the upper cavity and the lower cavity; detected gamma channel signals are mixed and processed through a gamma detection branchand then sent to a coincidence circuit and a counter; a beta channel signal detected by the 4pibeta multi-wire proportional chamber detector is processed by a beta detection branch; a coincidence channel signal is generated after the processed gamma channel signal and the processed beta channel signal are coincident, and the coincidence channel signal is sent to the counter; and the counter counts, and the processing unit acquires the radioactive activity value of the radioactive source. The invention further discloses a 4pibeta-gamma coincidence measurement method based on the multi-wire proportional chamber. The 4pibeta multi-wire proportional chamber detector which is designed independently is utilized, so that the source making difficulty of 4pibeta-gamma coincidence measurement of theradioactive activity absolute measurement method can be effectively reduced, and the radioactive activity value of a radioactive source such as a plane source can be directly measured.

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 ra

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