FoodGuard-1 Food Screening System Based on NaI(Tl) Radiaiton Detectors

The ORTEC FoodGuard-1 Sodium Iodide Food Screening system is designed for the rapid screening of foodstuffs, both solids and liquids, for radioactive isotope contamination. Primarily designed for "front line" response for food producers, traders, import, and export agencies, etc., FoodGuard-1 is an out of the box solution developed specifically to get you up and testing samples in a matter of minutes.

  • High efficiency counting and easy sample loading using 3” x 3” NaI Radiation detector in bench-top lead shield.
  • Simple to assemble with USB connected digiBASE that contains all required electronics: miniaturized preamplifier and detector high voltage with powerful digital signal processing and multichannel analyzer.
  • Intuitive software display, high degree of automation and results storage or printing.
  • Clear results with calculations such as percentage of maximum permitted concentration (MPC).
  • Immediate feedback with audible alarms to warn of sample activities that exceed a user-set percent of MPC limit.
  • Light enough to be transported to the place of use, such as a port for food market.
  • Supplied pre-calibrated and ready to use with sample containers and a check source.
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    • A simple-to-use answer to the screening of foodstuffs for radioactive contamination, now further enhanced.
    • Suitable for counting of a wide variety of sample types.
    • Meets regulatory detection limit requirements:
      • Clear results with calculations such as percentage of maximum permitted concentration (MPC).
      • Immediate feedback with audible alarms to warn of sample activities that exceed a user-set percent of MPC limit.
    • Ready for immediate use “out-of-the-box” including standard sample containers. Check sample included.
    • Intuitive software for data collection, display, and storage.
    • Transportable and easily deployed cart option.

    Hardware Features

    • High efficiency counting and easy sample loading using 3” x 3” NaI detector in bench-top low background lead shield, optionally mounted on easy-to-maneuver wheeled cart .
    • Simple setup with USB-connected ORTEC digiBASE all-in-one digital preamplifier and detector high voltage and powerful digital signal processing multichannel analyzer.
    • Digitally stabilized against temperature variations.

    The ORTEC FoodGuard-1 Foodstuffs Monitoring system can rapidly and accurately screen foodstuffs for the radionuclides expected from release events from nuclear power plants: for example 131I, 103Ru, 134Cs and 137Cs. Total Cesium (the sum of 134Cs and 137Cs activities) can also be reported. The system is battery operated, portable, and low power so it can be used where the foodstuffs are gathered, imported, sold or consumed. It is easily transportable and a cart mounted option allows the system to be used in places such as food markets where the system is easily brought to the product. 

    The FoodGuard-1 system hardware consists of a sodium iodide (NaI(Tl)) spectroscopic gamma-detector in a lead shield, an ORTEC digiBASE all-in-one spectrometer, a laptop PC and laser printer. The digiBASE supplies the multichannel analyzer function, the high voltage for the NaI detector, and all the signal processing electronics. Internal stabilization electronics and internal check source allow the system to be used over a wide range of environmental conditions. 

    Principle of Operation
    Sample material is placed in a Marinelli beaker (supplied). The beaker is then placed on the detector in the shield. The operator starts the process using the FoodGuard software and is guided through a series of questions. The software collects the data, analyzes the spectrum, checks the results against allowable limits, and prints the report. The spectra and reports are also saved on the laptop hard disk. Samples that exceed defined limits are clearly marked on the report for quick results reporting that can easily be shared.

    The spectrum analysis uses an "interference ROI matrix" method, approved by the US FDA for the monitoring of foodstuffs.

    The matrix operations are based on Numerical Recipes.

    Calibration
    The system is delivered pre-calibrated for gain and efficiency. The fixed efficiency calibration is pre-determined by the dimensions of the detector crystal and the sample containers used. Gain calibration is adjustable and once set is stabilized against temperature drift. Standard 1-liter Marinelli beaker containers are included with the system, and the factory calibration ensures accurate results if these containers are used. The naturally occurring isotope, 40K, is also reported and can be used to monitor system performance as well as providing the reference peak for gain stabilization. 

    Lower MDC and Increased Customization with FoodGuard-2 HPGe System
    FoodGuard-1 is designed for rapid analysis of the most common radionuclides expected from nuclear power plant events. For lower MDC, more advanced reports, and customizable nuclide libraries, ORTEC has developed the FoodGuard-2 High Resolution Germanium system.  
  • Specifications +


    Hardware
    Detector
    3” x 3” NaI detector with ORTEC digiBASE: 14-Pin PMT base with integrated bias supply, preamplifier, and MCA (with digital signal processing). Typical resolution 8% for 137Cs 662 keV gamma ray. 
    Spectrum Stabilizer Spectrum Stabilizer  The digiBASE features built-in gain stabilization circuitry. Stabilization is performed by “locking onto” a reference peak in the spectrum, supplied by the 40K gamma ray from a small potassium chloride sample inside the shield.
    Interface to PC Full-speed (12 Mbps) USB 2.0 Interface. The ultra-low power digiBASE is powered from the USB cable.
    Lead Shield Bench-top, low-background lead shield which can accommodate a one liter Marinelli beaker (individual lead shield designs may differ).
    1-Liter Marinelli Beakers Commonly available beakers, model GA-MA 133N-E including lid. Six included with system.
    Calibration Check Source A calibration check source, comprising ~2 kg of KCl (contains 40K) is provided
    Transport Cart The transport cart makes the system easy to use in areas such as vegetable markets, food packing plants and production facilities. It is easily maneuvered and has locking wheels. Cart dimensions: 24 in. x 24 in. base x 36 in. height

    Software
    FG-1-BW  FoodGuard-1 version 2.0 Food Monitoring Package provides easy-to-use routines for system calibration and operation, including peak overlap correction, MPC calculations and audible alarm facility. 131I, 103Ru, 134Cs, and 137Cs are the monitored nuclides. The naturally-occurring isotope 40K is also reported and can be used to monitor system performance. 
    MAESTRO MCA Software is used for spectrum display and system adjustment and calibration prior to sample measurements. It is a highly versatile “smart” MCA program which allows the FoodGuard-1 system hardware to be used for a number of other radiation measurement tasks such

    Computer Requirements
    PC capable of operating Microsoft® Windows® XP Professional SP3 or Windows 7 and a CD-ROM drive (software is supplied on CD). A printer is required for hard copy output.
  • Ordering Information +


    Model Description
    FOODGUARD-1-PC-CART Complete NaI-based food monitoring system with computer and transport cart. Includes:
    • ORTEC 905-4 3” x 3” integral NaI detector and photomultiplier
    • ORTEC G5-FOODGUARD-1 low-background lead shield (30 mm thick)
    • ORTEC digiBASE all-in-one high performance digital electronics, MCA and high voltage supply
    • FG-1-BW FoodGuard-1 V2.0 food monitoring software
    • 6 each GA-MA 133N-E 1L marinelli beakers with lids
    • 40K (KCl) ring source for stabilization
    • Marinelli beaker calibration check source: ~2 kg of KCl 
    • ORTEC PC-L-FG standard laptop
    • ORTEC PC-PRT-1 LaserJet printer
    • FGCART transport cart
    FOODGUARD-1-CART Complete NaI-based food monitoring system with transport cart. Includes:
    • ORTEC 905-4 3” x 3” integral NaI detector and photomultiplier
    • ORTEC G5-FOODGUARD-1 low-background lead shield (30 mm thick)
    • ORTEC digiBASE all-in-one high performance digital electronics, MCA and high voltage supply
    • FG-1-BW FoodGuard-1 V2.0 food monitoring software
    • 6 each GA-MA 133N-E 1L marinelli beakers with lids
    • 40K (KCl) ring source for stabilization
    • Marinelli beaker calibration check source: ~2 kg of KCl 
    • FGCART transport cart
    FOODGUARD-1-PC  Complete NaI-based food monitoring system with computer. Includes:
    • ORTEC 905-4 3” x 3” integral NaI detector and photomultiplier
    • ORTEC G5-FOODGUARD-1 low-background lead shield (30 mm thick)
    • ORTEC digiBASE all-in-one high performance digital electronics, MCA and high voltage supply
    • FG-1-BW FoodGuard-1 V2.0 food monitoring software
    • 6 each GA-MA 133N-E 1L marinelli beakers with lids
    • 40K (KCl) ring source for stabilization
    • Marinelli beaker calibration check source: ~2 kg of KCl 
    • ORTEC PC-L-FG standard laptop
    • ORTEC PC-PRT-1 LaserJet printer
    FOODGUARD-1 NaI-based food monitoring system. Includes:
    • ORTEC 905-4 3” x 3” integral NaI detector and photomultiplier
    • ORTEC G5-FOODGUARD-1 low-background lead shield (30 mm thick)
    • ORTEC digiBASE all-in-one high performance digital electronics, MCA and high voltage supply
    • FG-1-BW FoodGuard-1 V2.0 food monitoring software
    • 6 each GA-MA 133N-E 1L marinelli beakers with lids
    • 40K (KCl) ring source for stabilization
    • Marinelli beaker calibration check source: ~2 kg of KCl
    Options
    FGCART Transport Cart. Securely carries the shielded detector, and provides a convenient shelf mount for the system laptop computer.
    Cart dimensions: 24 in. x 24 in. base x 36 in. height.
    1L-MARINELLI-CASE
    Full case (33) of additional GA-MA 133N-E 1L Marinelli beakers with lids.