Beta-ray position detection device and method based on scintillating fibers

Abstract

The invention discloses a beta-ray position detection device based on scintillating fibers. The device comprises a collimator and a position sensitive detector, wherein the collimator is used for allowing beta rays perpendicular to the incident position sensitive detector to strike the scintillating fibers in the position sensitive detector by virtue of the incident beta-rays perpendicular to the plane direction of the position sensitive detector; and the position sensitive detector is positioned in the rear of the collimator and is used for detecting the positions of the vertical incidence beta rays passing through the collimator. The invention also discloses a position detection method. According to the device and method disclosed by the invention, the two-dimensional position information of the beta rays can be simultaneously acquired by adopting an optical fiber fabric; light loss in light collection can be reduced, so that a large-area beta-ray position sensitive detector is possible; the light collection efficiency is improved, and position resolution and energy resolution are promoted; and moreover, the number of photomultipliers is greatly saved, and the cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of radiation detection, and in particular relates to a β-ray position detection device and method based on a scintillation optical fiber. Background technique [0002] Beta-ray detectors are often used for surface contamination detection of beta radioactive substances. For the detection of beta radioactive contamination of personnel (especially the wounded), it is necessary to measure the location distribution of beta contamination sources in order to take local decontamination to avoid bacterial infection and radioactive substances entering the body. Internal irradiation. [0003] Generally, β-ray position-sensitive detectors use plastic scintillators coupled to position-sensitive photomultiplier tubes to form position-sensitive detectors. Due to the high cost of position-sensitive photomultiplier tubes, they are not suitable for large-area β-ray position-sensitive detectors. . For example, the Hamamatsu ...

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Problems solved by technology

[0003] Generally, the β-ray position sensitive detector adopts plastic scintillator coupled to the position-sensitive photomultiplier tube to form a position-sensitive detector. Since the cost of the position-sensitive photomultiplier tube is very expensive, it is not suitable for large-area β-ray position-sensitive detectors.

For example, the Hamamatsu H8500 position-sensitive photomultiplier tube has an effective area of ​​52mm×52mm, but the price is about 40,000 yuan. If you want to design a position-sensitive detector with a size of 52cm×52cm for personnel, you need 100 photomultiplier tubes. The cost of this item reached 4 million

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