WO2006056133A1 - Backscatter security inspection method for liquid by radiation source and its device - Google Patents

Backscatter security inspection method for liquid by radiation source and its device Download PDF

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Publication number
WO2006056133A1
WO2006056133A1 PCT/CN2005/001997 CN2005001997W WO2006056133A1 WO 2006056133 A1 WO2006056133 A1 WO 2006056133A1 CN 2005001997 W CN2005001997 W CN 2005001997W WO 2006056133 A1 WO2006056133 A1 WO 2006056133A1
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Prior art keywords
liquid
detector
density
data
collimator
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English (en)
French (fr)
Inventor
Yulan Li
Haifeng Hu
Yinong Liu
Zhiqiang Chen
Kejun Kang
Li Zhang
Wanlong Wu
Yuanjing Li
Yi Wang
Wenjun He
Mingrui Qi
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Tsinghua University
Nuctech Co Ltd
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Tsinghua University
Nuctech Co Ltd
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
    • G01N23/20066—Measuring inelastic scatter of gamma rays, e.g. Compton effect
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N23/00—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00
    • G01N23/20—Investigating or analysing materials by the use of wave or particle radiation, e.g. X-rays or neutrons, not covered by groups G01N3/00 – G01N17/00, G01N21/00 or G01N22/00 by using diffraction of the radiation by the materials, e.g. for investigating crystal structure; by using scattering of the radiation by the materials, e.g. for investigating non-crystalline materials; by using reflection of the radiation by the materials
    • G01N23/203—Measuring back scattering
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
    • G01V5/00—Prospecting or detecting by the use of ionising radiation, e.g. of natural or induced radioactivity
    • G01V5/20—Detecting prohibited goods, e.g. weapons, explosives, hazardous substances, contraband or smuggled objects
    • G01V5/22—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays
    • G01V5/222—Active interrogation, i.e. by irradiating objects or goods using external radiation sources, e.g. using gamma rays or cosmic rays measuring scattered radiation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N2223/00—Investigating materials by wave or particle radiation
    • G01N2223/60—Specific applications or type of materials
    • G01N2223/637—Specific applications or type of materials liquid

Definitions

  • the invention relates to the field of radiation detection technology, in particular to a method and a device for backscattering safety detection of a liquid by a radiation source.
  • the inspection methods used in the prior art mainly include: chemical methods, electromagnetic methods, and neutron detection methods.
  • the chemical detection method is further divided into the odor recognition method and the ion scanning explosive detection method. These methods are often unable to realize the detection because the liquid articles are sealed and packaged in practical applications, and the chemical detection method has high sensitivity and high false detection rate. Disadvantages. Electromagnetic detection methods are susceptible to electromagnetic interference due to weak signals, and liquid objects packaged in metal cannot be detected.
  • the use of the neutron detection method will cause radiation residual to the liquid to be tested due to "neutron activation", and the radiation shielding is complicated, the stability is poor, the equipment is large, and the investment is high, which is not suitable for large-scale use in the civil aviation security inspection system.
  • the conventional X-ray scanning detection system X-rays transmitted through the object to be inspected are passed into the detector, and the density distribution in the object to be inspected is reflected according to the change in intensity, and the intensity of the image is converted into image gradation, thereby obtaining A perspective image of the item being inspected.
  • This X-ray scanning detection method of imaging by discriminating the density difference of the object to be inspected cannot achieve imaging detection of a liquid article having a uniform density distribution.
  • the present invention provides a method and apparatus for backscattering safe detection of liquids using a source of radiation.
  • the device does not need to open the packaging of the liquid article during use, and the backscattering detection of the liquid article by the radiation source can obtain the density information of the measured liquid, and the device of the invention has Small size, easy to use, fast and accurate detection, strong anti-interference, safe and reliable, easy to protect. Applicable to the security system of civil aviation and other important places.
  • a method for backscattering safety detection of a liquid using a radioactive source comprising using a radioactive source, a collimator, a detector, a data collector, and a computer data processor, the main steps of which are:
  • the detector transmits the received data to the data collector
  • the data collector transmits the amplified data to a computer data processor for processing and obtains the liquid density of the measured object, and compares the result with the density of the dangerous goods in the existing database, and if found to be consistent with the density of the dangerous goods, Call the police.
  • a device for implementing the above method for backscattering safety detection of a liquid by a radioactive source comprising a radioactive source, a collimator, a detector, a data collector with an amplifying forming circuit, and a computer data processor with a density substance density database .
  • the structural feature is that the radiation source is placed on the side of the rotating platform mechanism on which the liquid object to be inspected can be placed, and the detector is placed on the same side as the radiation source and faces the Compton scattered light beam of the liquid object to be inspected. . Place the collimator in front of the detector.
  • the data output lead of the detector is connected to the data collector, and the data collector is connected to the computer data processor.
  • the source is an X-ray machine or an isotope.
  • the detector employs a solid detector array composed of a scintillation crystal coupled photodiode.
  • the invention provides a device for backscattering safety detection of a liquid by using a radioactive source, which comprises a radioactive source, a collimator, a detector, and a data acquisition circuit with an amplification forming circuit.
  • a radioactive source which comprises a radioactive source, a collimator, a detector, and a data acquisition circuit with an amplification forming circuit.
  • a collector and a computer data processor with a database of dangerous substance density characterized in that the source is placed on the side of a rotating platform mechanism on which a liquid item to be inspected can be placed, the detector being placed on the same side as the source And facing the Compton scattered beam of the liquid object to be inspected, a collimator is placed in front of the detector, the data output wire of the detector is connected to the data collector, and the data collector is connected to the computer data processor.
  • the device according to the invention is characterized in that said source (1) is an X-ray machine or an isotope.
  • the device according to the invention is characterized in that said detector (3) employs a solid detector array consisting of a scintillation crystal coupled photodiode.
  • the present invention also provides a method for backscattering safety detection of a liquid using a radiation source, comprising using a radiation source, a collimator, a detector, a data collector, and a computer data processor, the main steps of which are :
  • the detector transmits the received data to the data collector
  • the data collector transmits the amplified data to a computer data processor for processing and obtains the liquid density of the measured object, and compares the result with the density of the dangerous goods in the existing database, and if found to be consistent with the density of the dangerous goods, Call the police.
  • the present invention adopts the above method and device, and uses a radioactive source to perform backscatter detection on a packaged liquid article whose rotation can be controlled, obtains density information of the measured liquid article, and stores the density information of the measured liquid and the database.
  • the dangerous liquid density values are compared to determine if the measured liquid is a dangerous product.
  • the invention has the advantages of convenient use, rapid and accurate detection, strong anti-interference, safety and reliability, and easy protection.
  • Figure 1 is a schematic structural view of the present invention
  • FIG. 2 is a partial enlarged view of the backscattering safety detection of the present invention.
  • the present invention includes a radioactive source using an X-ray machine or an isotope, a collimator 2, a detector 3 comprising a scintillation crystal coupled photodiode, a solid detector array, a data collector 4 with an amplifying forming circuit, and a strip Computer Data Processor 5 of the Dangerous Goods Substance Database.
  • the radiation source 1 is placed on the side of the rotating platform mechanism 6 on which the liquid object to be inspected can be placed, and the detector 3 is placed on the same side as the radiation source 1 and faces the Compton scattered light beam of the liquid object to be inspected.
  • the data output lead of the detector 3 is connected to the data collector 4, and the data collector 4 is connected to the computer data processor 5.
  • the detector 3 transmits the received data to the data collector 4.
  • the data collector 4 transmits the amplified data to the computer data processor 5 for processing and obtains the liquid density of the measured object, and compares the result with the density of the dangerous goods in the existing database, if the density of the dangerous goods is found. If it is consistent, it will alarm.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Geophysics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • High Energy & Nuclear Physics (AREA)
  • Analysing Materials By The Use Of Radiation (AREA)
  • Measurement Of Radiation (AREA)
  • Geophysics And Detection Of Objects (AREA)

Description

一种用放射源对液体进行背散射
安全检测的方法及其装置 技术领域
本发明涉及辐射检测技术领域， 特别是用放射源对液体进行 背散射安全检测的方法及其装置。
背景技术
民航的安检体系中， 需要对乘客随身携带的液体物品在不开 封的情况下进行检查。 现有技术中使用的检查方法主要有： 化学 方法、 电磁方法和中子检测方法。 化学检测方法中又分为气味识 别法和离子扫描炸药探测法等， 这些方法在实际应用中常常因为 液体物品被密封包装而无法实现检测， 而且化学检测方法具有敏 感性强、 误检率高的缺点。 电磁检测方法由于信号微弱容易受到 电磁干扰， 而且不能检测用金属包装的液体物品。 中子检测方法 的使用会因 "中子活化" 对被检液体造成辐射残留， 而且辐射屏 蔽复杂、 稳定性差、 设备占地面积大、 投资高， 不适合在民航的 安检体系中大规模使用。 现有的 X射线扫描检测系统是将透过被 检物品的 X射线穿到探测器中， 根据其强度变化， 反映被检物品 中的密度分布， 并将射线强度变换成图像灰度， 从而获得被检物 品的透视图像。 这种通过分辨被检物品密度差异进行成像的 X射 线扫描检测方法无法实现对密度分布均匀的液体物品的成像检 测。
发明内容
为了克服上述现有技术中存在的不足， 本发明的目的是提供 一种用放射源对液体进行背散射安全检测的方法及其装置。 本装 置在使用时无需打开液体物品的包装， 利用放射源对液体物品进 行背散射检测， 即可获得所测液体的密度信息， 本发明装置具有 体积小、 使用方便、 检测迅速准确、 抗干扰性强、 安全可靠、 易 于防护的优点。 适用于民航和其它重要场所的安检体系。
为了达到上述的发明目的， 本发明的技术方案以如下方式实 现：
一种用放射源对液体进行背散射安全检测的方法， 它包括使 用放射源、 准直器、 探测器、 数据采集器及计算机数据处理器， 其主要步驟为：
1 )将被检的液体物品放置在可转动的平台上；
2 )由放射源发出射线穿透液体物品的包装层后在液体表层发 生康普顿散射；
3 )散射光子经过准直器后被探测器接收；
4 )探测器将接收的数据传输到数据采集器；
5 )数据采集器将放大成形的数据传输到计算机数据处理器进 行处理并得到所测物品的液体密度， 再将结果与现有数据库中危 险品的密度作比较， 若发现与危险品密度一致则报警。
实现上述的用放射源对液体进行背散射安全检测的方法的装 置， 它包括放射源、 准直器、 探测器、 带放大成形电路的数据采 集器及带危险品物质密度数据库的计算机数据处理器。 其结构特 点是， 所述放射源置于可放置被检的液体物品的旋转平台机构一 侧， 所述探测器与放射源置于同侧并正对被检的液体物品的康普 顿散射光束。 探测器前面放置准直器。 探测器的数据输出导线与 数据采集器连接， 数据采集器与计算机数据处理器连接。
在上述的装置中， 所述放射源采用 X光机或者同位素。 在上述的装置中， 所述探测器采用闪烁晶体耦合光电二极管 组成的固体探测器阵列。
本发明提供一种用放射源对液体进行背散射安全检测的装 置， 它包括放射源、 准直器、 探测器、 带放大成形电路的数据采 集器及带危险品物质密度数据库的计算机数据处理器， 其特征在 于，所述放射源置于可放置被检的液体物品的旋转平台机构一侧， 所述探测器与放射源置于同侧并正对被检的液体物品的康普顿散 射光束， 探测器前面放置准直器， 探测器的数据输出导线与数据 采集器连接， 数据釆集器与计算机数据处理器连接。
按照本发明所述的装置， 其特征在于， 所述放射源（1 )采用 X光机或者同位素。
按照本发明所述的装置， 其特征在于， 所述探测器（3 )采用 闪烁晶体耦合光电二极管组成的固体探测器阵列。
本发明还提供一种利用所述的装置用放射源对液体进行背散 射安全检测的方法， 它包括使用放射源、 准直器、 探测器、 数据 采集器及计算机数据处理器， 其主要步骤为：
1 )将被检的液体物品放置在可转动的平台上；
2 )由放射源发出射线穿透液体物品的包装层后在液体表层发 生康普顿散射；
3 )散射光子经过准直器后被探测器接收；
4 )探测器将接收的数据传输到数据采集器；
5 )数据采集器将放大成形的数据传输到计算机数据处理器进 行处理并得到所测物品的液体密度， 再将结果与现有数据库中危 险品的密度作比较， 若发现与危险品密度一致则报警。
本发明由于采用了上述的方法和装置， 利用放射源对封装的 可控制其旋转的液体物品进行背散射检测， 得到所测液体物品的 密度信息， 再将所测液体的密度信息与数据库中存储的危险液体 密度值进行比较， 从而判断所测液体是否为危险品。 同现有技术 相比， 本发明使用方便、 检测迅速准确、 抗干扰性强、 安全可靠、 易于防护。
下面结合附图和具体的实施方式对本发明做进一步的说明。 附图说明
图 1为本发明的结构示意图；
图 2为本发明背散射安全检测的局部放大图。
具体实施方式
参看图 1， 本发明包括采用 X光机或者同位素的放射源 1、 准直器 2、 采用闪烁晶体耦合光电二极管組成固体探测器阵列的 探测器 3、 带放大成形电路的数据采集器 4及带危险品物质密度 数据库的计算机数据处理器 5。 放射源 1置于可放置被检的液体 物品的旋转平台机构 6—侧， 探测器 3与放射源 1置于同侧并正 对被检的液体物品的康普顿散射光束。 探测器 3前面放置准直器 2。 探测器 3的数据输出导线与数据采集器 4连接， 数据采集器 4 与计算机数据处理器 5连接。
本发明装置应用中的步骤为：
1 ) 将被检的液体物品放置在可转动的旋转平台机构 6上。
2 )由放射源 1发出射线穿透液体物品的包装层后在液体表层 发生康普顿散射。
3 )散射光子经过准直器 2后被探测器 3接收。
4 )探测器 3将接收的数据传输到数据采集器 4。
5 )数据采集器 4将放大成形的数据传输到计算机数据处理器 5 进行处理并得到所测物品的液体密度， 再将结果与现有数据库 中危险品的密度作比较， 若发现与危险品密度一致则报警。

Claims

权 利 要 求
1. 一种用放射源对液体进行背散射安全检测的方法， 它包括 使用放射源、 准直器、 探测器、 数据采集器及计算机数据处理器， 其主要步骤为：
1 )将被检的液体物品放置在可转动的平台上；
2)由放射源发出射线穿透液体物品的包装层后在液体表层发 生康普顿散射；
3)散射光子经过准直器后被探测器接收；
4)探测器将接收的数据传输到数据采集器；
5)数据采集器将放大成形的数据传输到计算机数据处理器进 行处理并得到所测物品的液体密度， 再将结果与现有数据库中危 险品的密度作比较， 若发现与危险品密度一致则报警。
2. 实现如权利要求 1所述的用放射源对液体进行背散射安全 检测的方法的装置， 它包括放射源（ 1 )、准直器 ( 2 )、探测器（ 3 )、 带放大成形电路的数据采集器（ 4 )及带危险品物质密度数据库的 计算机数据处理器（5), 其特征在于， 所述放射源 （1)置于可放 置被检的液体物品的旋转平台机构 （6) —侧， 所述探测器 （3) 与放射源（ 1 )置于同侧并正对被检的液体物品的康普顿散射光束， 探测器 （3)前面放置准直器 （2)， 探测器 （3) 的数据输出导线 与数据采集器 （4)连接， 数据采集器 （4) 与计算机数据处理器
(5) 连接。
3. 按照权利要求 2所述的装置，其特征在于，所述放射源（ 1 ) 采用 X光机或者同位素。
4. 按照权利要求 2或 3所述的装置， 其特征在于， 所述探测 器 （3) 采用闪烁晶体耦合光电二极管组成的固体探测器阵列。
5. 一种用放射源对液体进行背散射安全检测的装置， 它包括 放射源 （1)、 准直器 （2)、 探测器 （3)、 带放大成形电路的数据 釆集器（4)及带危险品物质密度数据库的计算机数据处理器（5)， 其特征在于， 所述放射源（1)置于可放置被检的液体物品的旋转 平台机构（6)—侧， 所述探测器（3)与放射源 （1)置于同侧并 正对被检的液体物品的康普顿散射光束， 探测器（3)前面放置准 直器（2), 探测器（3)的数据输出导线与数据采集器（4)连接， 数据采集器 （4) 与计算机数据处理器 （5) 连接。
6. 按照权利要求 5所述的装置，其特征在于，所述放射源 ( 1 ) 采用 X光机或者同位素。
7. 按照权利要求 5或 6所述的装置， 其特征在于， 所述探测 器 （3) 采用闪烁晶体耦合光电二极管组成的固体探测器阵列。
8. —种利用权利要求 5-7之一所述的装置用放射源对液体进 行背散射安全检测的方法， 它包括使用放射源、 准直器、探测器、 数据采集器及计算机数据处理器， 其主要步驟为：
1) 将被检的液体物品放置在可转动的平台上；
2 )由放射源发出射线穿透液体物品的包装层后在液体表层发 生康普顿散射；
3)散射光子经过准直器后被探测器接收；
4)探测器将接收的数据传输到数据采集器；
5)数据采集器将放大成形的数据传输到计算机数据处理器进 行处理并得到所测物品的液体密度， 再将结果与现有数据库中危 险品的密度作比较， 若发现与危险品密度一致则报警。
PCT/CN2005/001997 2004-11-26 2005-11-25 Backscatter security inspection method for liquid by radiation source and its device Ceased WO2006056133A1 (en)

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US7400706B2 (en) 2008-07-15
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