Digital compton summing spectrometer based on integrated position sensitive cadmium zinc telluride detector and energy spectrum detection method thereof

Abstract

The present application relates to a gamma-ray detection device and its working method, in particular to a digital Compton addition spectrometer based on an integrated position-sensitive CdZnTe detector and its energy spectrum detection method, aiming to solve the problems of low detection efficiency and low energy resolution of the existing Compton addition spectrometer. The present application comprises a position-sensitive CdZnTe detection crystal, a multi-channel digital signal acquisition electronics module, a data recording and analysis unit, and a power supply. The position-sensitive CdZnTe detection crystal is composed of detection units arranged in an array, the upper cathode is a common cathode structure, and the lower anode is an array of multiple anodes. The multi-channel digital signal acquisition electronics module is used to acquire the pulse signals generated on the cathode and anode by the interaction of the incident gamma rays with the position-sensitive CdZnTe detection crystal, respectively, to obtain the generation time, the detection unit, and the intensity of the pulse signals.

Description

Technical Field

[0001] This invention relates to gamma-ray detection devices and their operating methods, specifically to a digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector and its energy spectrum detection method. Background Technology

[0002] The Compton summation spectrometer is mainly composed of a main crystal and an outer crystal. It measures the recoil electrons and scattered photons generated by the interaction of gamma rays with matter, and sums the outputs of the two to obtain a full-energy peak without the Compton plateau. In this way, a single-peak energy spectrum is obtained for monoenergetic gamma rays.

[0003] Traditional Compton summation spectrometers typically employ a dual-probe or multi-probe structure, consisting of a main probe and one or more coincidence probes, along with corresponding electronic circuitry and coincidence measurement and analysis modules. When gamma rays undergo Compton scattering interaction in one detector, almost simultaneously, the scattered photons are absorbed by another detector. The coincidence output of the detectors is used as the gating signal for the multichannel analysis system, and the pulse signals from the two detectors are summed and output. Conversely, signals generated by only a single detector at any given time are not analyzed and output.

[0004] Existing Compton summation spectrometers have a limited number of detectors, which are loosely distributed, resulting in low energy resolution and detection efficiency. For example, the detection efficiency of a dual-detector Compton summation spectrometer is only 10. -3 -10 -4 In addition, traditional Compton and spectral analyzers often use scintillators, such as NaI(Tl), LaBr3(Ce), or BGO crystals, which have low energy resolution. Furthermore, the low detection efficiency results in a limited number of full-energy peak counts, leading to poor overall performance of the spectrometer in measuring the γ-ray spectrum. Summary of the Invention

[0005] The purpose of this invention is to solve the problems of low detection efficiency and low energy resolution of existing Compton summation spectrometers, and to provide a digital Compton summation spectrometer based on an integrated position-sensitive zinc-cadmium telluride detector and its energy spectrum detection method.

[0006] To achieve the above objectives, the technical solution provided by this invention is:

[0007] A digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector is characterized by including a position-sensitive cadmium zinc telluride detector crystal, a multi-channel digital signal acquisition electronics module, a data recording and analysis unit, and a power supply.

[0008] The position-sensitive zinc cadmium telluride detector crystal consists of multiple detector units arranged in an array, a cathode, and an anode; the cathode is attached to the upper end of the multiple detector units arranged in an array, adopting a common cathode array structure; the anode is attached to the lower end of the multiple detector units arranged in an array, including multiple anodes arranged in an array that correspond one-to-one with the multiple detector units.

[0009] The multi-channel digital signal acquisition electronics module is used to acquire the pulse signal generated on the anode by the interaction between the incident γ-rays and the position-sensitive zinc cadmium telluride detector crystal.

[0010] The data recording and analysis unit is used to record the generation time of the pulse signal, the corresponding detection unit, and the pulse signal intensity;

[0011] The power supply provides high voltage to the position-sensitive cadmium zinc telluride detector crystal, as well as power the multi-channel digital signal acquisition electronics module and the data logging and analysis unit.

[0012] Furthermore, the location-sensitive zinc cadmium telluride detector crystal has a size of 22mm×22mm×15mm, and its crystal units number 121 and are arranged in an 11×11 configuration.

[0013] Furthermore, the multi-channel digital signal acquisition electronics module includes a signal acquisition circuit and a digital multichannel analyzer connected in sequence; the signal acquisition circuit includes a charge-sensitive preamplifier, a pole-zero cancellation circuit, and an inverting amplifier connected in sequence; the digital multichannel analyzer includes an impedance matching circuit, a gain circuit, and an ADC digital signal acquisition and processing module connected in sequence.

[0014] Meanwhile, this invention also provides an energy spectrum detection method based on an integrated position-sensitive cadmium zinc telluride detector, employing the aforementioned digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector, characterized by the following steps:

[0015] Step 1: Gamma rays are incident on the position-sensitive zinc cadmium telluride detector crystal, where the photoelectric effect, Compton effect and pair production occur, generating a pulse signal;

[0016] Step 2: The multiple anodes arranged in the array each output corresponding pulse signals;

[0017] Step 3: The multi-channel digital signal acquisition electronics module acquires the pulse signal to obtain the time of the gamma-ray interaction, the detection unit where it is located, and the intensity of the generated pulse signal;

[0018] Step 4: The data recording and analysis unit sums the pulse signals generated by all detection units at the same timestamp and finally outputs the Compton summation energy spectrum after coincidence analysis.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] 1. The present invention provides a digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector. It has a simple and compact structure, strong scalability, and can process and analyze a large amount of gamma-ray data, thereby improving the user's work efficiency.

[0021] 2. The present invention provides a digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector, which can perform position resolution and has the advantages of high detection efficiency and high energy resolution, and is suitable for a variety of complex measurement environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of an embodiment of the digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector of the present invention;

[0023] Explanation of reference numerals in the attached figures:

[0024] 1-Position-sensitive cadmium zinc telluride detector crystal, 101-Anode, 102-Cathode; 2-Signal acquisition circuit, 21-Charge-sensitive preamplifier, 22-Pole-zero cancellation circuit, 23-Inverting amplifier; 3-Digital multichannel analyzer, 31-Impedance matching circuit, 32-Gain circuit, 33-ADC digital signal acquisition and processing module; 4-Data recording and analysis unit; 5-Power supply. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0026] A digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector, see [link to documentation]. Figure 1 ;

[0027] It includes a position-sensitive zinc-cadmium telluride detection crystal 1, a multi-channel digital signal acquisition electronics module, and a data recording and analysis unit 4; the multi-channel digital signal acquisition electronics module includes a signal acquisition circuit 2 and a digital multichannel analyzer 3 connected in sequence; the signal acquisition circuit 2 includes a charge-sensitive preamplifier 21, a pole-zero cancellation circuit 22, and an inverting amplifier 23 connected in sequence; the digital multichannel analyzer 3 includes an impedance matching circuit 31, a gain circuit 32, and an ADC digital signal acquisition and processing module 33 connected in sequence.

[0028] The cathode 102 attached above the position-sensitive zinc cadmium telluride detector crystal 1 adopts a common cathode structure, and the anode 101 below it consists of multiple anodes arranged in an array.

[0029] The multi-channel digital signal acquisition electronics module is used to acquire the pulse signals generated on the anode 101 by the interaction between the incident gamma rays and the position-sensitive zinc cadmium telluride detector 1; the multi-channel digital signal acquisition electronics module is used to record the generation time, the detector unit where the pulse signal is located, and the intensity of the pulse signal;

[0030] Power supply 5 provides high voltage to the position-sensitive zinc-cadmium telluride detection crystal 1 and powers the multi-channel digital signal acquisition electronics module and data recording and analysis unit 4.

[0031] In this embodiment, the position-sensitive zinc cadmium telluride detector crystal 1 has a size of 22mm×22mm×15mm, and its crystal units are 121 in number and arranged in an 11×11 pattern.

[0032] Meanwhile, this embodiment also provides an energy spectrum detection method based on an integrated position-sensitive cadmium zinc telluride detector, using the aforementioned digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector, including the following steps:

[0033] Step 1: Gamma rays are incident on the position-sensitive zinc cadmium telluride detector crystal 1, where the photoelectric effect, Compton effect and pair production occur, generating a pulse signal;

[0034] Step 2: The multiple anodes 101 arranged in the array output corresponding pulse signals respectively;

[0035] Step 3: The multi-channel digital signal acquisition electronics module acquires the pulse signal to obtain the time of the gamma-ray interaction, the detection unit where it is located, and the intensity of the generated pulse signal;

[0036] Step 4: The data recording and analysis unit 4 sums the pulse signals generated by all detection units at the same timestamp and finally outputs the Compton summation energy spectrum after coincidence analysis.

[0037] The digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector provided in this embodiment has an energy resolution better than 2% (@662keV), which is higher than that of a typical scintillator detector.

Claims

1. A digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector, characterized in that, It includes a position-sensitive zinc-cadmium telluride detection crystal (1), a multi-channel digital signal acquisition electronics module, a data recording and analysis unit (4), and a power supply (5); The position-sensitive zinc cadmium telluride detector crystal (1) consists of multiple detector units arranged in an array, a cathode (102), and an anode (101); the cathode (102) is attached to the upper end of the multiple detector units arranged in an array, and adopts a common cathode array structure; the anode (101) is attached to the lower end of the multiple detector units arranged in an array, and includes multiple anodes arranged in an array that correspond one-to-one with the multiple detector units; The multi-channel digital signal acquisition electronics module is used to acquire the pulse signal generated on the anode (101) by the interaction between the incident γ-rays and the position-sensitive zinc cadmium telluride detector crystal (1). The data recording and analysis unit (4) is used to record the generation time of the pulse signal, the corresponding detection unit, and the pulse signal intensity; The power supply (5) is used to provide high voltage to the position-sensitive zinc cadmium telluride detection crystal (1) and to power the multi-channel digital signal acquisition electronics module and the data recording and analysis unit (4); The location-sensitive zinc cadmium telluride detector crystal (1) has a size of 22mm×22mm×15mm, and its crystal units are 121 in number and arranged in an 11×11 pattern.

2. The digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector according to claim 1, characterized in that: The multi-channel digital signal acquisition electronics module includes a signal acquisition circuit (2) and a digital multichannel analyzer (3) connected in sequence. The signal acquisition circuit (2) includes a charge-sensitive preamplifier (21), a pole-zero cancellation circuit (22), and an inverting amplifier (23) connected in sequence. The digital multichannel analyzer (3) includes an impedance matching circuit (31), a gain circuit (32), and an ADC digital signal acquisition and processing module (33) connected in sequence.

3. A method for energy spectrum detection based on an integrated position-sensitive cadmium zinc telluride detector, employing the digital Compton summation spectrometer based on an integrated position-sensitive cadmium zinc telluride detector as described in claim 1 or 2, characterized in that, Includes the following steps: Step 1: Gamma rays are incident on the position-sensitive zinc cadmium telluride detector crystal (1), where photoelectric effect, Compton effect and pair production occur to generate pulse signals; Step 2: The multiple anodes (101) arranged in the array output corresponding pulse signals respectively; Step 3: The multi-channel digital signal acquisition electronics module acquires the pulse signal to obtain the time of the gamma-ray interaction, the detection unit where it is located, and the intensity of the generated pulse signal; Step 4: The data recording and analysis unit (4) sums the pulse signals generated by all detection units at the same timestamp and finally outputs the Compton summation energy spectrum after coincidence analysis.

Images