Abstract:
A sensor interface system interfaces a collection of one or more sensors that can sense chemical, biological, radiation, nuclear, and explosives (CBRNE) materials. The system includes one or more digital and/or analog sensor interfaces for communicating with one or more sensors including: chemical sensors, biological sensors, radiation sensors, nuclear sensors, and explosives sensors. A processor is configured to receive and process signals from the one or more digital and/or analog sensor interfaces, and when the one or more sensors include a radiation sensor and/or nuclear sensor, the processor differentiates between gamma pulses and neutron pulses, by: receiving a signal from an output of a neutron detector; analyzing a pulse shape of the signal; differentiating the pulse shape between gamma pulses and neutron pulses; and determining that the pulse shape of the signal is one of a gamma pulse and a neutron pulse.

Description:
CROSS-REFERENCE TO RELATED APPLICATIONS 
       [0001]    This application is a continuation of co-pending U.S. patent application Ser. No. 11/931,370, filed on Oct. 31, 2007, which is a continuation of U.S. patent application Ser. No. 11/564,193, filed on Nov. 28, 2006, which is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/759,332, filed on Jan. 17, 2006, by inventor David L. FRANK, and entitled “Sensor Interface Unit And Method For Automated Support Functions For CBRNE Sensors”; and further which is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/759,331, filed on Jan. 17, 2006, by inventor David L. FRANK, and entitled “Method For Determination Of Constituents Present From Radiation Spectra And, If Available, Neutron And Alpha Occurrences”; and further which is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/759,373, filed on Jan. 17, 2006, by inventor David L. FRANK, and entitled “Distributed Sensor Network with Common Platform for CBRNE Devices; and further which is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/759,375, filed on Jan. 17, 2006, by inventor David L. FRANK, and entitled Advanced Container Verification System; and furthermore which is a continuation-in-part of, and claims priority from, prior co-pending U.S. patent application Ser. No. 11/291,574, filed on Dec. 1, 2005, which is a continuation-in-part of, and claims priority from, prior co-pending U.S. patent application Ser. No. 10/280,255, filed on Oct. 25, 2002, now U.S. Pat. No. 7,005,982 issued Feb. 28, 2006, that was based on prior U.S. Provisional Patent Application No. 60/347,997, filed on Oct. 26, 2001, now expired, and which further is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/631,865, filed on Dec. 1, 2004, now expired, and which furthermore is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/655,245, filed on Feb. 23, 2005, now expired, and which furthermore is based on, and claims priority from, prior co-pending U.S. Provisional Patent Application No. 60/849,350, filed on Oct. 4, 2006, and which furthermore is based on, and claims priority from, prior co-pending U.S. patent application Ser. No. 11/363,594 filed on Feb. 27, 2006, now U.S. Pat. No. 7,142,109 issued Nov. 28, 2006; the collective entire disclosure of the above-identified applications being hereby incorporated by reference. This application claims priority to co-pending U.S. patent application Ser. No. 12/472,707, filed on May 27, 2009, which is based on and claims priority to co-pending provisional U.S. Patent Application No. 61/128,947, entitled “Floating Intelligent Perimeter Sensor”, filed on May 27, 2008, and is also a continuation-in-part of and claims priority from, prior co-pending U.S. patent application Ser. No. 11/564,193 entitled “Multi-Stage System for Verification of Container Contents”, filed on Nov. 28, 2006, which is a continuation-in-part of, and claims priority from, prior co-pending U.S. patent application Ser. No. 11/291,574, filed on Dec. 1, 2005, which is a continuation-in-part of, and claims priority from, prior co-pending U.S. patent application Ser. No. 10/280,255, filed on Oct. 25, 2002, now U.S. Pat. No. 7,005,982 issued on Feb. 28, 2006, and that was based on prior U.S. Provisional Patent Application No. 60/347,997, filed on Oct. 26, 2001, now expired; and this application is also a continuation-in-part of and claims priority from, prior co-pending U.S. patent application Ser. No. 11/852,835 entitled “Distributed Sensor Network With A Common Processing Platform For CBMRNE Devices And Novel Applications”, filed on Nov. 28, 2006, which is a continuation-in-part of U.S. patent application No. 11/624,089 filed on Jan. 17, 2007, entitled “System Integration Module For CBRNE Sensors”, now U.S. Pat. No. 7,269,527; the collective entire disclosure of which being hereby incorporated by reference. 
     
    
     BACKGROUND OF THE INVENTION 
       [0002]    1. Field of the Invention 
         [0003]    This invention relates in general to sensor interface systems such as for sensors for detection of shipping container contents to detect and identify hazardous materials within containers, such as radiation and/or neutron emitting materials, explosives, and special materials such as highly enriched uranium, and further to identify the normally occurring radiological materials within containers. 
         [0004]    2. Description of Related Art 
         [0005]    Current attempts at providing radiation, neutron, explosives, and special materials, detection systems to verify shipping containers, such as those that have been mounted on the gantry crane arms, have a limited time to identify the isotopes present. Radiation sensor systems for detecting and identifying radiological materials held within shipping containers may not have the exposure time required to specifically identify all of the isotope types that may be present. The limited time to detect and identify the isotopes present may affect the ability to evaluate the validity of the contents. The limited time for interval provided by current shipping container detection systems, such as for use with gantry cranes, detrimentally affect the commercial viability of radiation, neutron, explosives, and special materials, detection systems and cause the containers to be manually interrogated which results in negative impacts to the flow of commerce. 
         [0006]    Therefore a need exists to overcome the problems with the prior art as discussed above. 
       SUMMARY OF THE INVENTION 
       [0007]    According to an embodiment of the present invention, a security system detects gamma and neutron radiation and hazardous materials inside shipping containers. The system detects and identifies radiation, explosives, and unauthorized hazardous materials within a shipping container. The sensors are configured as nodes on a network. The system collects data, such as radiation data, from one or more sensors. The system spectrally analyzes the collected radiation data. The system identifies one or more isotopes based on the spectrally analyzed radiation data. A central monitoring station can monitor radiation data and other data received from the sensors. Communication of sensor data can be done using TCP/IP communication over a data network. 
         [0008]    In order to verify whether radioactive materials are concealed within a shipping container, isotope sensing and identification systems can be deployed in association with a container, such as with a crane assembly used to lift shipping and transfer containers. An isotope sensing and identification system would consist of one or more gamma and neutron detectors that provide detailed radiation spectral data to an information processing system performing spectral analysis for the detection and identification of isotope(s) that are present in the containers. 
         [0009]    By identifying the specific isotope(s) that are present, according to one embodiment, it allows a security system to identify the types of goods or materials that the isotopes represent. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0010]      FIG. 1  is a picture depicting a container in proximity to a crane arm assembly (or a spreader bar) with sensors in sensor housings, in accordance with an embodiment of the present invention. 
           [0011]      FIG. 2  is a simplified diagram of a secondary radiation verification position. 
           [0012]      FIG. 3  is a block diagram illustrating an example of a data collection and analysis system, in accordance with an embodiment of the present invention. 
           [0013]      FIG. 4  is a block diagram illustrating an example of a central monitoring system, in accordance with an embodiment of the present invention. 
           [0014]      FIG. 5  is a diagram illustrating radiation sensors deployed in a push pull bar configuration of a crane spreader bar, according to an embodiment of the present invention. 
           [0015]      FIG. 6  is a diagram illustrating radiation sensors deployed about the main body of a crane spreader bar, according to an embodiment of the present invention. 
           [0016]      FIG. 7  is a diagram illustrating multiple background radiation environment effects. 
           [0017]      FIG. 8  is a diagram illustrating dynamic background radiation effects compensation. 
           [0018]      FIG. 9  is a formula useful for dynamic background radiation effects compensation. 
       
    
    
     DETAILED DESCRIPTION 
       [0019]    While the specification concludes with claims defining the features of the invention that are regarded as novel, it is believed that the invention will be better understood from a consideration of the following description in conjunction with the drawing figures, in which like reference numerals are carried forward. It is to be understood that the disclosed embodiments are merely exemplary of the invention, which can be embodied in various forms. Therefore, specific structural and functional details disclosed herein are not to be interpreted as limiting, but merely as a basis for the claims and as a representative basis for teaching one of ordinary skill in the art to variously employ the present invention in virtually any appropriately detailed structure. Further, the terms and phrases used herein are not intended to be limiting; but rather, to provide an understandable description of the invention. 
         [0020]    The terms “a” or “an”, as used herein, are defined as one, or more than one. The term “plurality”, as used herein, is defined as two, or more than two. The term “another”, as used herein, is defined as at least a second or more. The terms “including” and/or “having”, as used herein, are defined as comprising (i.e., open language). The term “coupled”, as used herein, is defined as connected, although not necessarily directly, and not necessarily mechanically. The terms “program”, “computer program”, “software application”, and the like as used herein, are defined as a sequence of instructions designed for execution on a computer system. A program, computer program, or software application may include a subroutine, a function, a procedure, an object method, an object implementation, an executable application, an applet, a servlet, a source code, an object code, a shared library/dynamic load library and/or other sequence of instructions designed for execution on a computer system. A data storage means, as defined herein, includes many different types of computer readable media that allow a computer to read data therefrom and that maintain the data stored for the computer to be able to read the data again. Such data storage means can include, for example, non-volatile memory, such as ROM, Flash memory, battery backed-up RAM, Disk drive memory, CD-ROM, DVD, and other permanent storage media. However, even volatile storage such as RAM, buffers, cache memory, and network circuits are contemplated to serve as such data storage means according to different embodiments of the present invention. 
         [0021]    The present invention, according to an embodiment, overcomes problems with the prior art by providing a multi-stage radiation verification process for the contents of a shipping container. The radiation sensor data collected at each stage of the verification process is used to enable detection and identification of the specific isotopes that are present in a container under examination. 
         [0022]    A noninvasive container contents detection and verification system, according to an embodiment of the present invention, operates without having to enter the cavity of a container under examination. The system can include multiple radiation sensor systems that use integrated digital sensors for Gamma and neutron detection, and with a spectral analysis capability to identify the specific isotope(s) of materials in containers. The multi-stage system provides for monitoring and tracking of targeted containers that are delivered to a secondary verification station. The multi-stage system provides for network connections between the spreader bar position and the secondary verification position to enable information integration. Such a multi-stage system can also include detection and identification of explosives and special materials in containers. These special materials may include highly enriched uranium. 
         [0023]    An embodiment of the invention includes radiation sensors deployed on the spreader bar of a gantry crane to provide radiation detection and isotope identification for the contents of the shipping container. The spreader bar is connected to the shipping container for approximately 30 seconds as the container is moved to or from the vessel at a port. The multi-stage radiation verification system enables radiation detection and analysis of the contents within the shipping container within the normal 30 seconds while the spreader bar is connected to the shipping container. The multi-stage system also allows for an extended time-period for the spreader bar to stay connected to the shipping container when radiological materials have been detected that the initial 30 second analysis does not allow adequate time for the identification of the isotopes present. In addition, the multi-stage radiation verification system uses a secondary sensor position for continued analysis of the shipping container if additional time is needed beyond the extended time provided at the spreader bar. The shipping container may be tracked as it moves from the spreader bar position to the secondary position. An example of tracking and monitoring devices include CCTV cameras and wireless tracking technologies such as radio frequency identification devices. 
         [0024]    According to an embodiment of the present invention, a crane arm assembly mounted sensor system may comprise a node within a distributed network of radiation sensor positions. An example of such a system is described in U.S. Patent Application No. 60/759,373, Filed on Jan. 17, 2006, and entitled “Distributed Sensor Network With Common Platform For CBRNE Devices”, the entire teachings of which being incorporated by reference. 
         [0025]    According to an embodiment of the present invention, a crane arm (spreader bar) mounted radiation sensor system, as described in patent application Ser. No. 11/363,594 filed on Feb. 27, 2006 is used for the detection and first stage of isotope identification for detected radiological material within a shipping container. 
         [0026]    A sensor concentrator unit may be used to connect multiple sensors in a group and enable efficient connection to the central processor for spectral analysis. This configuration could utilize a sensor interface unit (SIU) that is comprised of an integrated multi-channel analyzer, high voltage power supply, voltage system and communications interface. This SIU configuration uses a concentrator unit to combine multiple sensors into a concentrated communications channel for connection to the central processor. The communications concentrator provides individual IP addressed for each sensor group. An example of the concentrator unit is a device that provides multiple USB ports for sensor connection and concentrates the USB ports into an Ethernet connection for backhaul. 
         [0027]    An embedded processor unit may be used to connect multiple sensors in a group and enable efficient connection to the central processor for spectral analysis. This configuration could utilize a sensor interface unit (SIU) that is comprised of an integrated multi-channel analyzer, high voltage power supply, voltage system and communications interface. This SIU configuration is connected to an embedded processor supporting multiple sensors and providing one or more communications channel(s) for connection to the central processor. The embedded processor provides individual IP addressed for each sensor. 
         [0028]    According to another embodiment of the present invention, the time that the spreader bar is connected to the shipping container may be extended to enable further analysis and radiological data acquisition. 
         [0029]    According to another embodiment of the present invention, the time that the spreader bar is connected to the shipping container may be extended to enable further analysis and radiological data acquisition. 
         [0030]    According to another embodiment of the present invention, a secondary radiation verification system could be deployed as another node of the radiation verification system to enable further analysis and radiological data acquisition. 
         [0031]    According to another embodiment of the present invention, the targeted shipping container may be tracked and or monitored as it moves to the secondary radiation verification system. 
         [0032]    Described now is an example of a multi-stage radiation detection and identification system with one node mounted on a spreader bar of a crane assembly and another node deployed as a secondary radiation verification position. An example of a process for operation of the system is also discussed. 
         [0033]    A radiation detection and identification system deployed on a crane arm (or spreader bar)  102 , such as illustrated in  FIG. 1 , provides the first and second stages of a multi-stage radiation verification system.  FIG. 1  illustrates example installation positions for various sensor housings  101 ,  110 . Certain inventive features and advantages of exemplary embodiments of a radiation detection and identification system, such as deployed in connection with a crane assembly or other shipping container handling operation, will be discussed below. However, it is assumed that the reader has an understanding of radiation and sensor technologies. 
         [0034]    Referring to  FIGS. 1 and 2 , an example of a multi-node radiation verification system is shown. The system includes a spreader bar node (as shown in  FIG. 1 ) and a secondary radiation verification node  202  as shown in  FIG. 2 . A truck  220  carries a container  222  that contains cargo  215  inside the container  222 . Multiple radiation sensors  202  are deployed on either or both sides of the container  222  to enable further analysis of the contents  215 . A power distribution station  203  provides power to the sensors. A communication distribution module  204  couple signals between the multiple radiation sensors  202  and a distribution network  210  of which is further described in  FIG. 3 . Once a container cargo  215  is identified at the spreader bar stage as suspect, the container  222  is tracked and moved from the spreader bar position (as shown in  FIG. 1 ) to the secondary verification position (as shown in  FIG. 2 ) for further analysis. In this example, the secondary verification position includes positioning the container  222  by using a truck to move the container  222  to the multiple radiation sensors  202  deployed on either or both sides of the container  222 . 
         [0035]    With reference to  FIG. 3 , a data collection system  310 , in this example, is communicatively coupled via cabling, wireless communication link, and/or other communication link  305  with each of the gamma radiation sensor devices  301  and neutron sensor devices  302  in each sensor unit, and with each of the neutron pulse sensor device(s)  303 . The data collection system  310  includes an information processing system with data communication interfaces  324  that collect signals from the radiation sensor units  301 ,  302 , and from the neutron pulse device(s)  303 . The collected signals, in this example, represent detailed spectral data from each sensor device that has detected radiation. 
         [0036]    The data collection system  310  is modular in design and can be used specifically for radiation detection and identification, or for data collection for explosives and special materials detection and identification. 
         [0037]    The data collection system  310  is communicatively coupled with a local controller and monitor system  312 . The local system  312  comprises an information processing system that includes a computer, memory, storage, and a user interface  314  such a display on a monitor and a keyboard, or other user input/output device. In this example, the local system  312  also includes a multi-channel analyzer  330  and a spectral analyzer  340 . 
         [0038]    The multi-channel analyzer (MCA)  330  comprises a device composed of many single channel analyzers (SCA). The single channel analyzer interrogates analog signals received from the individual radiation detectors  301 ,  302 , and determines whether the specific energy range of the received signal is equal to the range identified by the single channel. If the energy received is within the SCA the SCA counter is updated. Over time, the SCA counts are accumulated. At a specific time interval, a multi-channel analyzer  330  includes a number of SCA counts, which result in the creation of a histogram. The histogram represents the spectral image of the radiation that is present. The MCA  330 , according to one example, uses analog to digital converters combined with computer memory that is equivalent to thousands of SCAB and counters and is dramatically more powerful and cheaper. 
         [0039]    The histogram is used by the spectral analysis system  340  to identify isotopes that are present in materials contained in the container under examination. One of the functions performed by the information processing system  312  is spectral analysis, performed by the spectral analyzer  340 , to identify the one or more isotopes, explosives or special materials contained in a container under examination. With respect to radiation detection, the spectral analyzer  340  compares one or more spectral images of the radiation present to known isotopes that are represented by one or more spectral images  350  stored in the isotope database  322 . By capturing multiple variations of spectral data for each isotope there are numerous images that can be compared to one or more spectral images of the radiation present. The isotope database  322  holds the one or more spectral images  350  of each isotope to be identified. These multiple spectral images represent various levels of acquisition of spectral radiation data so isotopes can be compared and identified using various amounts of spectral data available from the one or more sensors. Whether there are small amounts (or large amounts) of data acquired from the sensor, the spectral analysis system  340  compares the acquired radiation data from the sensor to one or more spectral images for each isotope to be identified. This significantly enhances the reliability and efficiency of matching acquired spectral image data from the sensor to spectral image data of each possible isotope to be identified. Once the one or more possible isotopes are determined present in the radiation detected by the sensor(s), the information processing system  312  can compare the isotope mix against possible materials, goods, and/or products, that may be present in the container under examination. Additionally, a manifest database  315  includes a detailed description of the contents of each container that is to be examined. The manifest  315  can be referred to by the information processing system  312  to determine whether the possible materials, goods, and/or products, contained in the container match the expected authorized materials, goods, and/or products, described in the manifest for the particular container under examination. This matching process, according to an embodiment of the present invention, is significantly more efficient and reliable than any container contents monitoring process in the past. 
         [0040]    The spectral analysis system  340 , according to an embodiment, includes an information processing system and software that analyzes the data collected and identifies the isotopes that are present. The spectral analysis software consists of more that one method to provide multi-confirmation of the isotopes identified. Should more than one isotope be present, the system identifies the ratio of each isotope present. Examples of methods that can be used for spectral analysis such as in the spectral analysis software according to an embodiment of a container contents verification system, include: 1) a margin setting method as described in U.S. Pat. No. 6,847,731; and 2) a LINSCAN method (a linear analysis of spectra method) as described in U.S. Provisional Patent Application No. 60/759,331, filed on Jan. 17, 2006, by inventor David L. Frank, and entitled “Method For Determination Of Constituents Present From Radiation Spectra And, If Available, Neutron And Alpha Occurrences”; the collective entire teachings of which being herein incorporated by reference. 
         [0041]    With respect to analysis of collected data pertaining to explosives and/or special materials, the spectral analyzer  340  and the information processing system  312  compare identified possible explosives and/or special materials to the manifest  315  by converting the stored manifest data relating to the shipping container under examination to expected explosives and/or radiological materials and then by comparing the identified possible explosives and/or special materials with the expected explosives and/or radiological materials. If the system determines that there is no match to the manifest for the container then the identified possible explosives and/or special materials are unauthorized. The system can then provide information to system supervisory personnel to alert them to the alarm condition and to take appropriate action. 
       Removal of Background Radiation Effects 
     Dynamic Background 
       [0042]    The background radiation at a seaport and more specifically the changing background associated with a moving container across land, sea, vessels and at different heights, poses a specific challenge to radiation detection and isotope identification. According to one embodiment of the present invention, this issue is addressed through the use of a dynamic background method used to compensate for the changing background effects. This method applies continuous background updates against the main background data. Different weights and intervals can be varied for the background updates to achieve the appropriate dynamic background for the specific application. An example formula is provided below, and also shown in  FIG. 9 . 
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         [0043]    As shown in  FIG. 7 , background radiation effects can vary depending on a varying background environment that can be experienced by the sensors, such as the sensors located at the spreader bar and/or sensors located at locations relative to changing background environments. For example, the sensors at the spreader bar can be over water, over a ship, high over the ground, low over the ground, or inside the ship. These different background environments can affect the radiation detection and isotope identification. Radiation from the sky should typically be predominant and remain normal during spreader bar movement. Also, sensors at the spreader bar should typically be protected by the container under examination and the spreader bar from most of the background radiation coming from the ground, water, and over the ship. Accordingly, a new and novel approach to compensate for the changing background effects applies continuous background updates against the main background data. 
         [0044]    As shown in  FIG. 8 , the dynamic background is comprised of the primary background and the incremental background. As radiation data is collected and processed for analysis, according to one embodiment of the present invention, the background environment effects can be subtracted from the collected data using continuous background updates against a main background data. This dynamic background compensation approach has the advantages of increased speed and sensitivity for dynamic background capture, memory efficiency in processing collected data, and flexibility to adjust to variable system parameters and to address specific applications. Further, an information processing system can learn a particular process used in locating sensors during data collection, such as to anticipate the changes in background effects in a normal operation and movement of the spreader bar. Additionally, the dynamic background compensation approach can provide a continuous differential subtraction of the effects of varying background environment. This approach enhances the quality of the analyzed data leading to better and more reliable radiation detection and isotope identification. 
         [0045]    According to an alternative embodiment of the present invention, a multiple background analysis approach can be used to remove varying background effects on the collected data. In one example, a GPS detector is mechanically coupled to the structure supporting the moving sensors, such as the crane spreader bar, and provides continuous location data (of the spreader bar) to an information processing system that is processing the collected data. The location of the spreader bar, for example, can indicate the type of background environment that is being experienced by the sensors at the spreader bar. The GPS detector operates in a well known manner and can provide both geographic location information and elevation information. Knowing the elevation of the spreader bar above, say, ground or sea level, can indicate the type of background effects that are experienced by the sensors at the spreader bar. The elevation information, and/or the geographic location information, can be, for example, compared against an expected map of structures and background environments in proximity to the spreader bar. These expected background environments correspond to background effects that can, for example, be subtracted from the collected data to provide better and more reliable data for analysis leading to better and more reliable radiation detection and isotope identification. Alternative location detection devices, including mechanical devices and/or electrical devices and/or manual data entry, can be used by the system to track changing backgrounds and corresponding background effects on collected data. 
         [0046]    Another use of the elevation information and the geographic location information by an information processing system is for controlling the triggers and effects of devices used to collect the radiation data. For example, a neutron pulse may be generated by a neutron pulse device that is included in the sensor system deployed at the spreader bar or on the gantry crane to provide an active analysis whereby gamma feedback following the neutron pulse can identify shielded radiological materials such as highly enriched uranium, explosives or illicit drugs, inside containers. However, a particular system implementation may limit the activation of the neutron pulse device to particular geographic areas and/or elevations above ground and/or sea level. For example, a neutron pulse device can be controlled to remain inactive while the crane and/or spreader bar are in close proximity to a crane operator&#39;s cabin or to a protected area such as one normally occupied by people. The flexibility and dynamic adjustment to different operational environments while enhancing the speed and reliability of data analysis, as discussed above, is a significant advantage of the present inventive system that was not available in the past. 
         [0047]    The user interface  314  allows service or supervisory personnel to operate the local system  312  and to monitor the status of radiation detection and identification of isotopes and/or the detection of RF signals by the collection of sensor units  301 ,  302  and  303  deployed on the frame structure, such as on the crane arm assembly (or spreader bar). 
         [0048]    The user interface  314 , for example, can present to a user a representation of the collected received returning signals, or the identified possible explosives and/or special materials in the shipping container under examination, or any system identified unauthorized explosives and/or special materials contained within the shipping container under examination, or any combination thereof. 
         [0049]    The data collection system can also be communicatively coupled with a remote control and monitoring system  318  such as via a network  316 . The remote system  318  comprises an information processing system that has a computer, memory, storage, and a user interface  320  such as a display on a monitor and a keyboard, or other user input/output device. The network  316  comprises any number of local area networks and/or wide area networks. It can include wired and/or wireless communication networks. This network communication technology is well known in the art. The user interface  320  allows remotely located service or supervisory personnel to operate the local system  312  and to monitor the status of shipping container verification by the collection of sensor units  301 ,  302  and  303  deployed on the frame structure, such as on the crane arm assembly (or spreader bar). The central monitoring system can display the position of the shipping container as it is moved to the secondary position through the use of CCTV cameras ( 350 ) or shipping container tracking systems ( 355 ). 
         [0050]    A neutron pulse device can be included in the sensor system deployed on the spreader bar or on the gantry crane to provide an active analysis whereby gamma feedback identifies shielded radiological materials such as highly enriched uranium, explosives or illicit drugs. 
         [0051]    Referring to  FIG. 4 , an example of a multi-node radiation verification system includes multiple spreader bar radiation verification systems ( 401 ) and secondary radiation verification nodes ( 404 ), operations center ( 408 ), container tracking system ( 410 ) and CCTV ( 402 ) cameras that are interconnected by a data network ( 405 ). In some cases a forklift truck is used to move the containers around the terminal. The forklift truck ( 420 ) is equipped with a spreader bar and can be configured as a wireless radiation verification node. 
         [0052]    Referring to  FIG. 5 , an example of a spreader bar with radiation sensors installed in the push pull bars is shown. In  FIG. 5 , one or more radiation sensors are integrated within the push pull bar  501 . The radiation sensors are enclosed in a box with shock absorbing connectors  511 . The gamma sensors  512  are shock mounted within the box on the lower side of the unit. The one or more gamma sensors comprise sensor resolution of 7% or better at 662 kev. The neutron sensors  514  and the supporting electronics  513  are mounted on the top side of the box. Alternative mounting arrangements of the one or more radiation sensors, the gamma sensors  512 , the neutron sensors  514 , and the supporting electronics  513 , relative to the push pull bar  501  should become obvious to those of ordinary skill in the art in view of the present discussion. 
         [0053]    Referring to  FIG. 6 , an example of a spreader bar with radiation sensors installed in the main unit  601  is shown. In the example of  FIG. 6 , the radiation sensors are integrated within the main unit  601 . The radiation sensors are enclosed in a box with shock absorbing connectors  611 . The gamma sensors  612  are shock mounted within the box on the lower side of the unit. The neutron sensors  613  and the supporting electronics  614  are mounted on the top side of the box. Alternative mounting arrangements of the one or more radiation sensors, the gamma sensors  612 , the neutron sensors  613 , and the supporting electronics  614 , relative to the main unit  601  should become obvious to those of ordinary skill in the art in view of the present discussion. 
         [0054]    By operating the system remotely, such as from a central monitoring location, a larger number of sites can be safely monitored by a limited number of supervisory personnel. Besides monitoring container handling operations such as from crane arm assemblies, as illustrated in the example of  FIG. 1 , it should be clear that many different applications can be deployed for the initial detection and identification stages for container analysis. For example, fork lift truck mounted sensor units communicating with a remote monitoring system allow radiation detection and identification where large amounts of cargo are moved and handled, such as at ports, railway, and intermodal stations, and at ships, airplanes, trucks, warehouses, and other carrier environments, and at such other places that have large amounts of cargo to handle as should be understood by those of ordinary skill in the art in view of the present discussion. 
         [0055]    Additionally, the system monitoring function can be combined to monitor more than radiation and explosives. Other types of hazardous elements can be monitored in combination with the radiation detection by combining appropriate sensors and detectors for these other types of hazardous elements with the radiation sensor units and monitoring system according to alternative embodiments of the present invention. 
         [0056]    The preferred embodiments of the present invention can be realized in hardware, software, or a combination of hardware and software. A system according to a preferred embodiment of the present invention can be realized in a centralized fashion in one computer system, or in a distributed fashion where different elements are spread across several interconnected computer systems. Any kind of computer system—or other apparatus adapted for carrying out the methods described herein—is suited. A typical combination of hardware and software could be a general purpose computer system with a computer program that, when being loaded and executed, controls the computer system such that it carries out the methods described herein. 
         [0057]    An embodiment according to present invention can also be embedded in a computer program product, which comprises all the features enabling the implementation of the methods described herein, and which—when loaded in a computer system—is able to carry out these methods. Computer program means or computer program in the present context mean any expression, in any language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following a) conversion to another language, code or, notation; and b) reproduction in a different material form. 
         [0058]    Each computer system may include one or more computers and at least a computer readable medium allowing a computer to read data, instructions, messages or message packets, and other computer readable information from the computer readable medium. The computer readable medium may include non-volatile memory, such as ROM, Flash memory, Disk drive memory, CD-ROM, and other permanent storage. Additionally, a computer readable medium may include, for example, volatile storage such as RAM, buffers, cache memory, and network circuits. Furthermore, the computer readable medium may comprise computer readable information in a transitory state medium such as a network link and/or a network interface, including a wired network or a wireless network, that allow a computer to read such computer readable information. 
         [0059]    Although specific embodiments of the invention have been disclosed, those having ordinary skill in the art will understand that changes can be made to the specific embodiments without departing from the spirit and scope of the invention. The scope of the invention is not to be restricted, therefore, to the specific embodiments, and it is intended that the appended claims cover any and all such applications, modifications, and embodiments within the scope of the present invention.