Trans-SPEC-N Battery Powered, Portable HPGe Gamma Spectrometer

trans-SPEC-N Battery Powered, Portable HPGe Gamma SpectrometerIn-Situ High Purity Germanium Gamma Spectroscopy for Portable Isotopic Neutron Spectroscopy Systems.”  

The trans-SPEC-N is an N-type HPGe gamma-ray spectrometer with everything needed in a single easy-to-handle package. There is no requirement for liquid nitrogen and no long cables. Everything is complete in one package and ready for use.

  • No LN2 — Miniature, high-reliability, "run for ever" Stirling-cycle cooler eliminates the need for LIQUID NITROGEN; detector element is encapsulated in high reliability, low loss, all-metal sealed cryostat.
  • Neutron Damage Resistance — N-type HPGe detector.
  • Large Energy Range — 40 keV to 11 MeV energy range for higher energy prompt gammas from neutron interactions.
  • High Sensitivity — Large (>40% relative efficiency) HPGe detector.
  • High Stability — Digital electronics give you the solution for the toughest analysis in the toughest conditions.
  • Bright and Clear — VGA resolution display with touch sensitive operator screen.
  • All-in-one Integrated Package — Rugged and compact with no interconnections — easy to setup and go.
  • Smart — Nuclide ID and activity calculation for nine Regions of Interest (ROI).
  • Well Connected — USB 2.0 and Wireless 802.11 Communications, built-in GPS, and Secure Digital Input/Output (SDIO) storage of acquired spectra.
  • Flexible — A variety of power sources can be used, including internal battery, supplemental external battery, automobile battery (any 12 V dc), and line power; all with automatic switchover.

trans-SPEC-N Applications

  • Neutron Gamma Spectroscopy
  • Chemical Waste Assay
  • Chemical Warfare Identification
  • Explosives Identification 
  • Specifications +

    Peak Shape 1.9 typical (FWTM/FWHM)
    Cryostat and Cooler Hardened” cryostat with high reliability, low power Stirling cooler. The cryostat design is such that the trans-SPEC-N may be switched off at any time and power subsequently re-applied without waiting for a full thermal cycle (complete warm up before cool down), as is normal practice with a HPGe detector system. This feature greatly increases system availability during measurement campaigns.
    Digital Noise Suppression LFR Filter

    Digital MCA and Data Processor

    Display VGA 640 x 480 TFT sunlight readable touch sensitive, operate with finger or stylus.
    Data Processor Marvel 806 MHz XScale.
    Data Storage To internal RAM and removable SD card.
    Computer Interfacing
    USB connection to laptop. Spectral transfer by Microsoft® ActiveSync. Remote control via Microsoft “remotedsp.exe” (supplied). Wi-fi (802.11) communication software optionally available.
    Internal NMEA compliant WAAS capable.
    Digital MCA
    with Internal Storage of Multiple Spectral Data.
    Digital Noise Suppression
    "LFR Filter" ORTEC (Patent Pending).
    Conversion Gain
    16k channel.
    Maximum Number of Stored Spectra
    Unlimited on removable media.
    Full Display and Zoom Modes
    Display of multiple ROIs.
    Main Display Configurable Status Line
    User-configurable parameter display allows two parameter choices from the following selection: cursor energy, location, live time, live time remaining, real time remaining, battery life remaining, count rate, count rate in ROI, and counts.
    Energy Calibration
    Quadratic fit of energy versus channel.
    On Line Activity Calculation
    Activity and uncertainty are calculated and reported on-screen, on-line for up to 9 user-defined regions. Activity is calculated as net count rate divided by user supplied efficiency factor.
    Multiple Presets Live time, real time, integral peak count, peak count, uncertainty and Multi-Nuclide MDA. Up to 20 nuclide ROIs may be specified. Acquisition halts when all MDA requirements have been satisfied. Real/Live Time in multiples of 1 sec.

    System Hardware Settings

    Coarse Gain 1, 2, 4, 8, 16, or 32
    Fine Gain 0.45 to 1

    With the available range of gain settings, the following FULL SCALE energy range is achievable ~40 keV to ~11 MeV.
    Conversion Gain
    The trans-SPEC-N conversion gain is software controlled from 512 to 16k channels.
    Dead-Time Correction
    Extended live-time correction according to Gedcke-Hale method. Accuracy: Area of reference peak changes ±3% from 0 to 50,000 counts per second.
    Integral Nonlinearity: <±0.025% over top 99.5% of spectrum, measured with a mixed source.
    Differential Nonlinearity: <±1%.
    Digital Spectrum Stabilizer: Controlled via computer, stabilizes gain and zero errors.
    Temperature Coefficient
    Gain: <35 ppm/°C. [Typically 30 ppm/°C.]
    Offset: <3 ppm/°C.
    Overload Recovery
    At maximum gain, recovers to within 2% of rated output from X1000 overload in 2.5 non-overloaded pulse widths. (Measured using the MAESTRO InSight Oscilloscope.)
    Pulse Pile-Up Rejector
    Automatically set threshold. Pulse-pair resolution typically 500 ns.
    Digital Gated Baseline Restorer
    Computer controlled adjustment of the restorer rate (High, Low and Auto). 
    U.S. Patent No. 5,912,825.
    Digital lower level discriminator set in channels. Hard cutoff of data in channels below the LLD setting.
    Digital upper level discriminator set in channels. Hard cutoff of data in channels above the ULD setting.
    Count-rate display on MCA and/or PC screen.

    Physical Specifications

    Maximum Overall Dimensions (including handle, Ge detector endcap and shock absorbers)   39.4 cm L x 16.3 cm W x 34.9 cm H (15.5" L x 6.55" W x 13.75" H)
    Weight 24.4 lb (11.1 kg)
    Internal Battery Life
    >3 hours at 25°C with a cold detector on fully charged internal battery; battery lifetime may be extended indefinitely by the use of external battery packs which are available in "battery belt" formats. The unit is expected to be kept running once cold.
    Input Power
    10–17 V dc 30 Watt or via auto-sensing Mains powered Battery Charger.
    Temperature Operation Range/Humidity
    –10 to +40°C, Relative Humidity <90% at 35°C, non-condensing.
    Communications Ports
    External Connectivity to System
    • 1 SD (Secure Digital) card slot (3.3 V).
    • 1 USB connection for "ActiveSync" capability or MCA operation with external computer (ActiveSync and remote display software included).
    • WiFi 802.11 communication software optional.
    • 1 Audio headphone jack.
    Cool Down Time
    The high reliability cooler is designed for continuous operation. Between measurements the unit is powered from a dc supply, car battery or other high capacity device. Initial cool down time depends on ambient temperature, but is typically <12 hours at 25°C.
  • Literature +

  • Ordering Information +

    Model Description
    TRANS-SPEC-N Trans-SPEC-N Portable Spectrometer complete with universal mains supply and MAESTRO software.