It is a kind of to use Plastic scintillation bulk measurement α, Beta-ray detectorTechnical field
The invention belongs to nuclear radiation detector fields, and in particular to a kind of using Plastic scintillation bulk measurement α, Beta-ray spySurvey device.
Background technology
Now with greatly developing for China's core industry, radiation protection embodies increasingly consequence.Plastic scintillationBody is the solid solution of organic scitillating material in the plastic, belongs to organic scintillator.It can be used for α, β, γ, etc. rays detection.It can be easily made the variously-shaped transparent body, have do not deliquesce, performance stabilization, radiation hardness, scintillation decay time it is short low with priceThe advantages that honest and clean is current using a kind of very wide scintillator.
Invention content
The purpose of the present invention is low to α, β surface contamination efficiency to solve plastic scintillant, the small problem of measurement area carriesFor a kind of using Plastic scintillation bulk measurement α, Beta-ray detector.
To achieve the above object, the technical solution used in the present invention is：It is a kind of to use Plastic scintillation bulk measurement α, β rayDetector, wherein：By detector head cover, fixed screw, aviation plug, multicore signal wire, probe body, light guide and modelingSudden strain of a muscle, photomultiplier, photomultiplier transit tube socket, signal processing circuit board, film frame, feet, positioning column composition；In probe bodyInner bottom surface on post the positioning foams of two same thickness, be equipped with one layer of aluminium foil in the light guide and the outer surface that modeling is dodged,And the measuring surface on its top is reserved, the light guide dodges the center for being fixed on probe body cavity with modeling；The photoelectricity timesIncrease tube socket to be welded on signal processing circuit board with multicore signal wire, and multicore signal wire is passed through and is fixed on probe bodyAviation plug digital signal is sent to the signal processing circuit portion point of outside；The bottom end of the photomultiplier is inserted in photoelectricity timesIncrease on tube socket, the top of photomultiplier is adhesive in the side that light guide is dodged with modeling by optics；The signal processing circuit boardIn the inner bottom surface of probe body, and felt pad is lined with below signal processing circuit board；The positioning column is logicalIt crosses and is screwed on probe body from strap bolt, feet is screwed in the top of positioning column, and by adjusting positioning columnLength fixes the upper and lower directions that light guide is dodged with modeling；The film frame is provided on the plane of incidence at the top of probe body, makes its lidFirmly light guide is dodged with modeling, and aluminium film is posted on film frame；The detector head cover is located on film frame and is fixed by fixed screw.
Further preferred scheme posts the foam of 1-2mm thickness at the back side of the head cover.
The present invention is transmitted and is collected photon using light guide, and it is few that photon transmits energy loss in light guide, therefore efficiency is very high.Since light has extraordinary efficiency of transmission in light guide, detector area is very big.Detector output is digital signal, sideContinue signal processing after an action of the bowels.The present invention can be applicable in the equipment of various surface contamination detections, using wide model, while according to applicationEquipment and requirement can suitably adjust the area of detector, achieve the purpose that measurement.Parameters reach IEC61098 states simultaneouslyBorder standard.Different shape can be made to adapt to different use conditions, can be applied to more surface contamination equipment.Detector is believedNumber output be digital signal, can access master system, adapt to various equipment.
Description of the drawings
Fig. 1 is the internal structure schematic diagram of the present invention；
Fig. 2 is the exterior view of Fig. 1；
Fig. 3 is the side view of Fig. 1.
Specific implementation mode
It is as shown in Figure 1 to Figure 3, a kind of described in the present embodiment to use Plastic scintillation bulk measurement α, Beta-ray detector,In：7, photoelectricity is dodged by detector head cover 1, fixed screw 2, aviation plug 3, multicore signal wire 4, probe body 5, light guide and modelingMultiplier tube 8, photomultiplier transit tube socket 9, signal processing circuit board 10, film frame 11, feet 13, positioning column 14 form；In detectorThe positioning foam 6 that two same thickness are posted in the inner bottom surface of shell 5 is equipped with one in the light guide and the outer surface of modeling sudden strain of a muscle 7Layer aluminium foil, and the measuring surface on its top is reserved, the light guide dodges 7 centers for being fixed on 5 cavity of probe body with modeling；InstituteIt states photomultiplier transit tube socket 9 to be welded on signal processing circuit board 10 with multicore signal wire 4, and multicore signal wire 4 is passed through and fixedAviation plug 3 on probe body 5 send digital signal to the signal processing circuit portion point of outside；The photomultiplier8 bottom end is inserted on photomultiplier transit tube socket 9, and the top of photomultiplier 8 is adhesive in the side of light guide and modeling sudden strain of a muscle 7 by opticsFace；The signal processing circuit board 10 is located in the inner bottom surface of probe body 5, and under signal processing circuit board 10Face is lined with felt pad 12, plays insulating effect；The positioning column 14 from strap bolt by being screwed on probe body 5, feet 13It is screwed in the top of positioning column 14, and fixes the upper and lower of light guide and modeling sudden strain of a muscle 7 by adjusting the length of positioning column 14To；The film frame 11 is provided on the plane of incidence at 5 top of probe body, so that it is covered light guide and is dodged 7 with modeling, on film frame 11Post aluminium film；The detector head cover 1 is located on film frame 11 and is fixed by fixed screw 2, ensures that light guide dodges 7 sealing with modelingProperty.
The foam of 1-2mm thickness is posted in this implementation at the back side of the head cover 1.
The present invention can be applicable on fixed large scale equipment, also can be used alone, and not similar shape can be made according to use environmentShape and size.α, β ray are injected into the detector plane of incidence, and detector can send out fluorescent photon.Fluorescent photon is transmitted by light guide, is receivedAfter collection, the photon being collected into is amplified by photomultiplier, is input in signal processing circuit, is passed through in signal processing circuitAfter crossing amplification, examination, monostable circuit, it is directly output as digital signal.
The operating process of the present invention：First modeling is dodged and is wrapped with aluminium foil with light guide 7, its face upward is exposed.It then will be certainlyPositioning foam cushion 6 with gum is pasted onto the corresponding position of probe body 5, and light guide is dodged 7 with modeling is fixed on probe body 5The center of cavity.Photomultiplier transit tube socket 9 is welded on multicore signal wire 4 on signal processing circuit board 10, photomultiplier transitPipe 8 is inserted on photomultiplier transit tube socket 9, and multicore signal wire 4 passes through the aviation plug 3 being fixed on probe body 5 will be digitalSignal is sent to the signal processing circuit portion point of outside.The lining of felt pad 12 is in signal processing circuit board 10 in the following, playing insulating effect.Photomultiplier 8 is adhesive in light guide by optics and is dodged on 7 with modeling.Positioning column 14 by being screwed on probe body 5 from strap bolt,Feet 13 is screwed on positioning column 14.Light guide and modeling 7 upper and lower directionss of sudden strain of a muscle are consolidated by adjusting the length of positioning column 14It is fixed.It is attached to the back side of head cover 1 with the foam of 2mm thickness, foam is cut according to the shape of head cover 1 along side.By aluminium film solid gumIt is attached on film frame 11, is placed on the plane of incidence of probe body 5, light guide is dodged 7 with modeling to be covered, then by detector head cover 1It is placed on film frame 11 and is fixed with fixed screw 2, ensure that light guide dodges 7 leakproofness with modeling.