CN205594172U - Lung's internal contamination detector of anti - compton scatter and background ray - Google Patents
Lung's internal contamination detector of anti - compton scatter and background ray Download PDFInfo
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- CN205594172U CN205594172U CN201620425519.9U CN201620425519U CN205594172U CN 205594172 U CN205594172 U CN 205594172U CN 201620425519 U CN201620425519 U CN 201620425519U CN 205594172 U CN205594172 U CN 205594172U
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Abstract
The utility model discloses a lung's internal contamination detector of anti - compton scatter and background ray, including detector, ADC, shaping circuit, compton scatter and background incident discrimination circuit, DAC, filter circuit, the detector is including the central detector and the several rejection detector that lie in the coplanar, and its detection method is: when central detector has output nuclear pulse signal, judge whether the rejection detector has nuclear pulse signal to judge whether the signal that central detector detected is compton scatter and background incident. The utility model discloses utilize central detector and peripheral rejection detector to develop the measurement simultaneously, examine out compton scatter and environmental background ray through the logical decision to showing and falling the background of measuring in the energy spectrum, improvement energy resolving rate of detector, peak well -being compare, help reducing the minimum observable activity to lung's internal contamination, improve measuring sensitivity. This detector has advantages such as small, light in weight, is convenient for develop the in -site measurement.
Description
Technical field
This utility model relates to a kind of nuclear pollution detector, particularly relates to the scattering of a kind of anti-Compton and pulmonary's internal contamination detector of background ray.
Background technology
Relating to core working space and nuclear accident region, some radionuclides, such as I-131, Cs-137 etc., after once being sucked by human body, meeting is in pulmonary deposition.Now for the detection of pulmonary's internal contamination deposit, generally using enumerator alignment human lung to measure the gamma-rays of pulmonary deposition nucleic release to estimate the nucleic deposition in pulmonary, Compton scattering and natural background are the principal elements affecting detection limit.At present, the measures such as the lead screen that pulmonary's internal contamination is taked in measuring, although there is certain environmental exact details shield effectiveness, add the weight of detection system simultaneously, and be difficult to reduce the background that Compton scattering is formed.This patent then can significantly decrease environmental exact details and Compton scattering background simultaneously.
Summary of the invention
The purpose of this utility model is that offer one solves the problems referred to above, can effectively screen the background ray to environment and Compton scattering ray, thus background significantly drops, improves the energy resolution of detector and detects activity, the anti-Compton scattering of sensitivity and pulmonary's internal contamination detector of background ray and detection method.
To achieve these goals, the technical solution adopted in the utility model is such that the scattering of a kind of anti-Compton and pulmonary's internal contamination detector of background ray, including detector, described detector includes a central detector being generally aligned in the same plane and several rejection detector, wherein rejection detector is connected around peripheral one week of central detector fixing with central detector side, and adjacent rejection detector fits tightly；
The outfan of described central detector connects one by the ADC of its core pulse signal analog digital conversion；
Described rejection detector outfan connects the shaping circuit that the core pulse signal of rejection detector is converted into square-wave signal one by one；
The outfan of described ADC and shaping circuit is also connected with a Compton scattering and this bottom event judging circuit；
Described Compton scattering and this bottom event judging circuit include:
It is connected with ADC outfan, identifies the threshold detection circuit of the time window of central detector output signal according to its output；
It is connected with threshold detection circuit outfan, the ping-pong buffer of the digital core pulse signal of storage center detector output,
Be connected with shaping circuit outfan, in the time window of central detector output signal to shaping circuit output signal ask successively or ask or circuit；
With the differentiation output circuit asked or the outfan of circuit and ping-pong buffer is connected；
Described Compton scattering and this bottom event judging circuit outfan are also connected with DAC and filter circuit in turn.
As preferably: described central detector and rejection detector are square or circular, and wherein central detector is Nal detector, and rejection detector is Nal detector or plastic resistor.
The detection method of pulmonary's internal contamination detector of the scattering of a kind of anti-Compton and background ray, comprises the following steps:
(1) set rejection detector as N number of, by carrying out 1,2,3 clockwise ..., N number, central detector numbered 0, by detector front just to human lung；
(2) ADC carries out Real-time Collection to center detector output signal, obtains the digital core pulse signal of central detector outputP c, meanwhile, the core pulse signal shaping pulse squaring signal S that each rejection detector is exported by shaping circuiti(i=1,2,3 ..., N)；
(3) Compton scattering and this bottom event judging circuit judge during Pc,S iWhether it is low level；
If SiIt is low level, then by this PcExport through digital to analog converter and filter circuit, otherwise then abandon.
As preferably: described step (3) particularly as follows:
(31) threshold detection circuit identifies the time window of central detector output signal according to threshold value；
(32) at this moment between square-wave signal S in window, to shaping circuit outputiAsk successively or, and this Pc is stored in ping-pong buffer；
(33) differentiate that output circuit judges, if asking or result is 0, then by this digital core pulse signal from ping-pong bufferP cExport through digital to analog converter and filter circuit, otherwise then abandon this digital core pulse signalP c。
As preferably: described ping-pong buffer is made up of 2 FIFO buffers, core pulse signal Pc distinguishes stored interleaved successively in 2 FIFO buffers.
Compared with prior art, the utility model has the advantage of: this utility model utilizes central detector to carry out measurement with peripheral rejection detector simultaneously, Compton scattering and environmental exact details ray is screened out by logical judgment, thus the background during significantly fall measures power spectrum, improve the energy resolution of detector, peak Kombi, contribute to reducing the minimum detectable activity to pulmonary's internal contamination, improve the sensitivity measured.The advantages such as it is little that the detector constructed by this patent has volume, lightweight, it is simple to carry out in-site measurement.
Operation principle of the present utility model is: central detector and rejection detector are respectively adopted the core pulse signal of pulmonary front and surrounding, by the signal mode number conversion of central detector, the signal of rejection detector is changed into square-wave signal, and identified the time window of central detector output signal according to threshold value by a threshold detection circuit, and between at this moment in window, to shaping circuit output square-wave signal Si ask successively or；If asking or result being 0, the signal retaining central detector exports through digital to analog converter and filter circuit, otherwise then abandons this signal.Signal, in signal acquisition stage, is just screened by this utility model, it is not necessary to rely on subsequent conditioning circuit, widely applicable.
Accompanying drawing explanation
Fig. 1 is this utility model schematic block circuit diagram；
Fig. 2 is a kind of structural representation of detector；
Fig. 3 is the another kind of structural representation of detector.
In figure: 1, central detector；2, rejection detector.
Detailed description of the invention
Below in conjunction with accompanying drawing, the utility model is described in further detail.
Embodiment 1: see Fig. 1 to Fig. 3, set up a kind of anti-Compton scattering as shown in Figure 1 and pulmonary's internal contamination panel detector structure of background ray, this structure includes detector, described detector includes a central detector 1 being generally aligned in the same plane and several rejection detector 2, wherein rejection detector 2 is connected around peripheral one week of central detector 1 fixing with central detector 1 side, and adjacent rejection detector 2 fits tightly；
The outfan of described central detector 1 connects one by the ADC of its core pulse signal analog digital conversion；
Described rejection detector 2 outfan connects the shaping circuit that the core pulse signal of rejection detector 2 is converted into square-wave signal one by one；
The outfan of described ADC and shaping circuit is also connected with a Compton scattering and this bottom event judging circuit；
Described Compton scattering and this bottom event judging circuit include:
It is connected with ADC outfan, according to the threshold detection circuit of the time window of its output signal identification central detector 1 output signal；
It is connected with threshold detection circuit outfan, the ping-pong buffer of the digital core pulse signal of storage center detector 1 output,
Be connected with shaping circuit outfan, in the time window of central detector 1 output signal to shaping circuit output signal ask successively or ask or circuit；
With the differentiation output circuit asked or the outfan of circuit and ping-pong buffer is connected；
Described Compton scattering and this bottom event judging circuit outfan are also connected with DAC and filter circuit in turn.
See Fig. 2 and Fig. 3, in the present embodiment: described central detector 1 and rejection detector 2 are square or circular, and central detector 1 is Nal detector, and rejection detector 2 is Nal detector or plastic resistor.
The detection method of above-mentioned detector comprises the following steps:
(1) it is N number of for setting rejection detector 2, by carrying out 1,2,3 clockwise ..., N numbers, and central detector 1 numbered 0, by detector front just to human lung；
(2) ADC carries out Real-time Collection to central detector 1 output signal, obtains the digital core pulse signal of central detector 1 outputP c, meanwhile, the core pulse signal shaping pulse squaring signal S that each rejection detector 2 is exported by shaping circuiti(i=1,2,3 ..., N)；
(3) Compton scattering and this bottom event judging circuit judge during Pc,S iWhether it is low level；
If SiIt is low level, then by this PcExport through digital to analog converter and filter circuit, otherwise then abandon.
Wherein: described step (3) particularly as follows:
(31) threshold detection circuit identifies the time window of central detector 1 output signal according to threshold value；
(32) at this moment between square-wave signal S in window, to shaping circuit outputiAsk successively or, and this Pc is stored in ping-pong buffer；
(33) differentiate that output circuit judges, if asking or result is 0, then by this digital core pulse signal from ping-pong bufferP cExport through digital to analog converter and filter circuit, otherwise then abandon this digital core pulse signalP c。
In the present embodiment: described ping-pong buffer is made up of 2 FIFO buffers, core pulse signal Pc distinguishes stored interleaved successively in 2 FIFO buffers.
In order to study the difference of this utility model detector and the common detector, the result obtained by Theoretical Calculation is as shown in table 1.
Table 1 this utility model detector and the common detector are in MDA and the comparison of lower background count interested
Annotation: the common detector is NaI detector, and its size is as central detector 1 size of this patent.
From table 1 it follows that this utility model detector can be greatly lowered interested under background and the minimum detectable activity (MDA) to point source can be effectively reduced in radioactivity background field.
Claims (2)
1. an anti-Compton scattering and pulmonary's internal contamination detector of background ray, it is characterized in that: include detector, described detector includes a central detector being generally aligned in the same plane and several rejection detector, wherein rejection detector is connected around peripheral one week of central detector fixing with central detector side, and adjacent rejection detector fits tightly；
The outfan of described central detector connects one by the ADC of its core pulse signal analog digital conversion；
Described rejection detector outfan connects the shaping circuit that the core pulse signal of rejection detector is converted into square-wave signal one by one；
The outfan of described ADC and shaping circuit is also connected with a Compton scattering and this bottom event judging circuit；
Described Compton scattering and this bottom event judging circuit include:
It is connected with ADC outfan, identifies the threshold detection circuit of the time window of central detector output signal according to its output；
It is connected with threshold detection circuit outfan, the ping-pong buffer of the digital core pulse signal of storage center detector output,
Be connected with shaping circuit outfan, in the time window of central detector output signal to shaping circuit output signal ask successively or ask or circuit；
With the differentiation output circuit asked or the outfan of circuit and ping-pong buffer is connected；
Described Compton scattering and this bottom event judging circuit outfan are also connected with DAC and filter circuit in turn.
Anti-Compton the most according to claim 1 scattering and pulmonary's internal contamination detector of background ray, it is characterized in that: described central detector and rejection detector are square or circular, wherein central detector is Nal detector, and rejection detector is Nal detector or plastic resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620425519.9U CN205594172U (en) | 2016-05-12 | 2016-05-12 | Lung's internal contamination detector of anti - compton scatter and background ray |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201620425519.9U CN205594172U (en) | 2016-05-12 | 2016-05-12 | Lung's internal contamination detector of anti - compton scatter and background ray |
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| CN205594172U true CN205594172U (en) | 2016-09-21 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974459A (en) * | 2016-05-12 | 2016-09-28 | 成都理工大学 | Reverse Compton scattering and background ray lung pollution detection device and method |
| CN107367752A (en) * | 2017-07-28 | 2017-11-21 | 成都理工大学 | Measure the horizontal device of ventilation filter frame radiative |
-
2016
- 2016-05-12 CN CN201620425519.9U patent/CN205594172U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105974459A (en) * | 2016-05-12 | 2016-09-28 | 成都理工大学 | Reverse Compton scattering and background ray lung pollution detection device and method |
| CN107367752A (en) * | 2017-07-28 | 2017-11-21 | 成都理工大学 | Measure the horizontal device of ventilation filter frame radiative |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20160921 Termination date: 20210512 |