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.
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  • More Information +


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

    The many ORTEC trans-SPEC and Detective instruments already in the field are demonstrating the reliability of the basic design and of the revolutionary miniature Stirling-cycle cooler which ensures reliable and efficient cooling of the integral HPGe detector. 

    HPGe Detector and Cooler
    The trans-SPEC-N HPGe detector is an ORTEC GMX Series N-type crystal that is 67 mm in diameter x 69 mm in length and >50% relative efficiency.

    The large HPGe crystal increases sensitivity and reduces time-to-MDA. The “over-square” geometry means best absolute efficiency up to in excess of 2 MeV. 

    The crystal is housed in an all-metal-sealed, ruggedized cryostat, and cooled by a highly reliable miniature Stirling-cycle cooler. This cooler is capable of approximately 1 W of heat lift at 100°K, and draws less than 25 W when operating.

    Digital Electronics
    Detector signal processing is achieved by advanced digital electronics. An active digital noise reduction filter (LFR) implemented in the digital spectrometer reduces the effect of mechanically generated microphonic noise on the detector output signal, resulting in good energy resolution. Full control of the electronics parameter settings is allowed from the user interface, under password control.

    Display and Control
    The trans-SPEC-N model features a bright and clear VGA resolution display with a touch sensitive operator screen. Menu navigation is highly intuitive. 
    The live radionuclide gamma-ray spectrum may be displayed and manipulated (e.g., vertical scale, zoom) similar to a conventional multichannel analyzer in both log and linear display modes.

    There are three rows of buttons that are logically grouped together. The top row is used for ROI manipulation and navigation, the second row is used for spectrum display control and the bottom row is for hardware control, storing spectra, and navigation into the Menu Mode.

    Real Time Activity Calculations . . .  NO PC Required!

    A trans-SPEC-N can perform simple nuclide activity calculations using internally stored calibration information, at the touch of a button, and all without the use of an attached PC. Everything is easily managed:  the library for analysis, displayed peak labels, unit labels and calibration parameters. 

    The parameters are all easily created and downloaded by MAESTRO (MCA emulation software) to the trans-SPEC-N, or entered directly. The parameters can be changed in the field to adapt to changing needs. Activity is calculated for the list of up to 9 nuclides. The spectral data can be saved and later re-analyzed in more detail using a more sophisticated PC-based analysis package such as GammaVision.

    Peak Info Function
    A peak information function allows the user to easily check that all is well with the data.

    Data Security
    MCA Data Security is an important consideration. The MENU has numeric password or PIN protection. The operations are separated into two groups: USER and ADMINISTRATOR. The USER password protects the instrument from unauthorized use, allowing the user to protect data stored in the internal memory. The ADMIN or Setup functions are protected by a different administrator password. The ADMIN functions can only be changed by the Administrator ensuring that your results are based on the correct parameters.

    Full Settings Control
    Full control of all relevant instrument settings is available under password protection.

    Instrument State-of-Health and Status
    The trans-SPEC-N HPGe detector incorporates "SMART-1™" diagnostics, which verify that the instrument is operating properly. State-of-health and instrument status is available at a glance.

    CONNECTIONS programs, such as MAESTRO which is included with the trans-SPEC-N, can read the state-of-health status parameters, and display them on a laptop, if connected, or they may be displayed on the trans-SPEC-N status screen. User-developed packages may read the status register through the trans-SPEC-N for maintaining the spectrum QA.

    Flexibility in Choice of Power Sources
    The trans-SPEC-N can draw power from a variety of sources. For initial cool down from ambient temperature, it is placed on the docking station, or attached to the compact AC/Power Adapter/Charger (PAC). The docking station provides small air movers to assist with initial cool down in conditions of high ambient temperature (>40°C).

    MCA Emulation and Spectral Analysis. . . MAESTRO MCA Emulator Included
    The latest version MAESTRO MCA software is included to run on your PC or laptop. It provides a standard graphical user interface and can be used to control all system parameters from the convenient larger screen. 

    MAESTRO is a member of the ORTEC CONNECTIONS family of products, and provides full networking with other ORTEC spectrometers and supporting computers. MAESTRO includes features for identifying peaks, editing libraries, and creating, printing and saving Regions of Interest (ROI), performing energy calibrations, automating tasks via using simple “Job Streams,” AND MORE!

    Create Your Own Custom Software with the Optional A11 Toolkit
    The A11 CONNECTIONS Programmer’s Toolkit is also optionally available for those who wish to integrate the trans-SPEC-N into their own software systems. The Toolkit offers ActiveX Controls to simplify programming with LabVIEW, Visual C++, and Visual Basic. For more information on the Toolkit, ask for the A11 Programmer’s Toolkit brochure.
  • 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.
    GPS
    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.
    Linearity
    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.
    LLD
    Digital lower level discriminator set in channels. Hard cutoff of data in channels below the LLD setting.
    ULD
    Digital upper level discriminator set in channels. Hard cutoff of data in channels above the ULD setting.
    Ratemeter
    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.
  • Ordering Information +


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