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Four-element parallel tellurium-zinc-cadmium nuclear radiation detector device

A nuclear radiation detector, a technology of cadmium zinc telluride, which is applied in the field of new nuclear radiation detector devices, can solve the problems of high preparation cost, high requirements for experimental equipment, low leakage current, etc., and achieves short detection time, high detection efficiency, and detection. large area effect

Inactive Publication Date: 2012-01-18
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high resistivity of CdZnTe material, it has a low leakage current, so it is widely used in small power, miniaturized circuits or integrated circuit electronic equipment, but now some large circuits need to use large For CdZnTe detectors with a detection area, the traditional method is to grow a large single crystal ZnCd material to achieve a large detection area detector. However, it is difficult to obtain a large single crystal detector grade CdZnTe material, which requires high requirements for experimental equipment. High cost of preparation

Method used

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  • Four-element parallel tellurium-zinc-cadmium nuclear radiation detector device
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  • Four-element parallel tellurium-zinc-cadmium nuclear radiation detector device

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Experimental program
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Effect test

Embodiment 1

[0020] Embodiment one: see figure 1 , the four-element parallel CdZnTe nuclear radiation device includes four CdZnTe detectors 1, each CdZnTe detector 1 respectively passes through a preamplifier 2 and then passes through a differential amplifier 3 and a main amplifier 4, and then together Connect an adding circuit 5, and finally the adding circuit 5 is connected to a multi-channel energy spectrometer 6 and a digital oscilloscope 7, and the signals measured by the four cadmium zinc telluride detectors 1 are amplified by the multi-channel energy spectrometer 6 and the digital oscilloscope. Waveformer 7 for processing.

Embodiment 2

[0021] Embodiment two: see figure 2 and image 3 , the present embodiment is basically the same as Embodiment 1, and the special feature lies in the structures of the preamplifier 2 and the differential amplifier 3:

[0022] a. In the signal input part, connect resistor R1 and capacitor C1 between the positive bias voltage and the ground terminal, load R2 on the detector D1, connect capacitor C2 between D1 and the gate of field effect transistor Q1, and the signal at D1 Terminal and C1 indirect resistor R6.

[0023] b. Take the field effect transistor Q1 as the input stage of the amplifier, the signal is input to the gate of Q1, the drain of Q1 and the DC voltage Ec are connected to the resistor R10, and R18 is connected between the source of Q1 and the ground terminal, and both ends of R18 Connect the capacitor C11 in parallel, and then input the drain signal to the positive input terminal of the differential amplifier U1A. The positive input terminal and Ec are connected...

Embodiment 3

[0024] Embodiment 3: The quaternary parallel cadmium zinc telluride nuclear radiation detector device includes a multi-channel energy spectrometer (ORTEC-PCI-8k), a digital oscilloscope (Tds3012B), a Frisch structure CZT device (10×10×5mm 3 ), radioactive source Cs 137 (16uCi), etc. Connect the preamplifier to a digital oscilloscope, and record its output waveform (as shown in the attached picture). This experiment uses the American Advanced Messurement Technology (ORTEC) company's Model 419 analog signal generator to output standard signals for debugging.

[0025] It can be seen from the figure that the output response voltage is 130mV, the rise time is 900ns, the duration is 0.2ms, the equivalent noise root mean square voltage is about 6mV, and its signal-to-noise ratio is 22:1. All performance is better than without preamplification.

[0026] Example experiment 1:

[0027] Carry out experiment with the device of embodiment three, Figure 5 is the output waveform.

[0...

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Abstract

The invention relates to a four-element parallel tellurium-zinc-cadmium nuclear radiation detector device, which comprises four tellurium-zinc-cadmium detectors. Each tellurium-zinc-cadmium detector is respectively connected with an adding circuit sequentially through a pre-amplifier, a differential amplifier and a main amplifier, and the adding circuit is finally connected with a multi-channel energy spectrometer and a digital oscilloscope. Signals detected by the four tellurium-zinc-cadmium detectors are processed by the multi-channel energy spectrometers and the digital oscilloscopes after being amplified. Compared with the traditional unit detector, the detector device has a large detection area and high detection efficiency, needs short detection time, is suitable for portable nuclear radiation detection spectrometers, and can be widely applied in nuclear waste monitoring, environmental monitoring, and radiation testing of goods at airports, ports and railways.

Description

technical field [0001] The invention relates to a new type of nuclear radiation detector device, that is, a four-element parallel CdZnTe detector. Compared with the existing detectors, the detector has a higher measurable area, higher detection efficiency, and shorter detection time. It is the development of a multi-element parallel detector. A feasible scheme is provided, which makes the detector develop towards a large volume, and makes the detection technology in the field of nuclear safety more mature and comprehensive. Background technique [0002] At present, nuclear radiation detectors at home and abroad can be roughly divided into three categories: gas detectors, scintillation detectors and semiconductor detectors. However, due to the superiority of semiconductor compound materials, such as the relatively low average energy required to excite a pair of electron-hole pairs, and the relatively high energy resolution, everyone focuses on the detector of semiconductor ma...

Claims

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Application Information

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IPC IPC(8): G01T1/24
Inventor 沈萍王林军施朱斌张继军梁小燕闵嘉华毕美梁巍王君楠
Owner SHANGHAI UNIV
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