Large-area beta detector with multi-region window and manufacturing method

Abstract

The invention discloses a large-area beta detector with a multi-region window and a manufacturing method. The large-area beta detector comprises a protective net cover, a protective layer, a reflective layer, a light guide cavity, a ray conversion layer and a photomultiplier. The ray conversion layer comprises a plurality of regions, a scintillator is arranged in each region, the scintillators indifferent regions have different luminescence decay time constants, and the plurality of regions are sequentially arranged according to the luminous decay time of the scintillators. According to the invention, the scintillators with different light-emitting decay time are used for manufacturing the ray conversion layer, rays are converted into visible light, the visible light is gathered to the photomultiplier through the light guide cavity, photoelectric conversion is carried out, current pulses with different widths are generated, voltage signals with different rise time are formed on a subsequent measurement circuit, and a beta event measured at a corresponding position on the detector is analyzed through a time measurement circuit.

Description

technical field [0001] The invention relates to the field of large-area radiation detectors, in particular to a large-area beta detector with multi-region windows and a manufacturing method. Background technique [0002] The basic working principle of the large-area plastic scintillation β detector is that when the plastic scintillation sheet of the detector is subjected to ionizing radiation, it emits visible light (the decay time is determined by the material), which is reflected by the light guide cavity and collected to the photocathode of the photomultiplier tube, and then converted Multiplies the output current pulses for collection, analysis and recording of subsequent circuits. [0003] Large-area plastic flash β detector is a new type of radiation detector developed after 2005. Because of its advantages of high detection efficiency, strong output signal, easy to enlarge the detection area, and strong environmental adaptability, it is currently widely used on human b...

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing large-area β detection performance of the single-region window is poor, and the background is large, which leads to an increase in the detection limit and many unnecessary radiation protection operations. The large-area β detector and its manufacturing method solve the problems of improving the accuracy of β detection position discrimination and measurement performance

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