Minitype 4 pi beta proportional counter

Abstract

The invention discloses a minitype 4 pi beta proportional counter, mainly composed of columnar and symmetry up and down 2 pi proportional counters, wherein the gilt tungsten wire in the counter is used as anode and the two ends of the gilt tungsten wire respectively pass through copper tube and are welded with the copper tube, and the shell of the counter is used as cathode and the copper tube passes through the shell and insulates with the shell by olytetrafluoroethylene sleeve. A base is connected with the bottom of the device by bolt joint and a spring is set between the copper tube and shell. A sample torr is set between the two 2 pi proportional counters. The invention provides a minitype 4 pi beta proportional counter with even electric field distribution, high signal-noise ratio, narrow pulse width, suitable for measuring at high counting rate.

Description

technical field [0001] The invention relates to the field of absolute measurement of radionuclide activity, in particular to a small-sized 4πβ proportional counter. Background technique [0002] At present, relevant experimental research under the nuclear test ban conditions urgently needs to provide accurate data on the nuclear decay parameters of short-lived nuclides, and corresponding measuring devices need to be established. Surface barrier semiconductor detectors are used as β detectors or two thin plastic scintillators are used as β detectors. These two detectors are not suitable for measuring VYNS thin film sources and their β detection efficiency is low, about 70-80%. Can not well meet the requirements of the absolute measurement of radioactivity. In the 1990s, 4πβ proportional counters were used in measuring devices. The plateau length of the 4πβ proportional counters is about 200V, and the plateau slope is less than 1% / 100V. Because of the poor uniformity of the e...

AI Technical Summary

Problems solved by technology

[0002] At present, relevant experimental research under the nuclear test ban conditions urgently needs to provide accurate data on the nuclear decay parameters of short-lived nuclides, and corresponding measuring devices need to be established. Surface barrier semiconductor detectors are used as β detectors or two thin plastic scintillators are used as β detectors. These two detectors are not suitable for measuring VYNS thin film sources and their β detection efficiency is low, about 70-80%. Does not well meet the requirements for absolute measurement of radioactivity

In the 1990s, 4πβ proportional counters were used in measuring devices. The plateau length of the 4πβ proportional counters is about 200V, and the plateau slope is less than 1% / 100V. Because of the poor uniformity of the electric field distribution, better technical performance cannot be obtained.

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