Hand_held_HPGe_NitroSpec.doc

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Handy HPGe Detector
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  1.APLICATION The NitroSPEC is intended for Gamma and X-radiation registration and analysis used in theradiological control of environmental objects, materials and products of industry and farming, objectsof nuclear industry enterprises dealing with storage and processing of radioactive wastes.The NitroSPEC is the world's smallest liquid nitrogen cooled Spectrometer which consists of HPGe detector, Dewar vessel for liquid nitrogen, MCA with software package and visualizationmonitor integrated in one miniature monounit to provide easy and comfortable use. 2.FEATURES ã All in one solution; ã Minimal sizes and weight; ã Ready for operation in short time; ã Long autonomous operational time; ã Simple and cheap in maintenance and service. 3.COMPLETE SET ã HPGe coaxial detector GCD-10180 with preamplifier and Dewar vessel; ã Built-in Digital 16K Multi Channel Analyzer; ã Analytical software package; ã Touch screen display; ã Built-in GPS module; ã Communication interface (USB, wireless); ã Removable Tungsten alloy collimators. ã Documentation set in English; Head Management:Dr. Gostilo Vladimir Dr. Sokolov Alexander Mr. Moshak Vladimir  Bank details:Nordea Bank Finland PLC Latvia branchBank code: NDEALV2XIBAN account: LV13 NDEA00000802 26011Commercial registration number: 40003176361VAT Registration No. LV40003176361Place of registration: Riga, Latvia Hand-held Spectrometer based onHigh-Purity Germanium Coaxial DetectorNitroSPEC  ã Accessories: o Spare battery; o Adaptor for charging; o Funnel for liquid nitrogen filling; o Hard-sided transport case; 4.TECHNICAL CHARACTERISTICS4.1Technical characteristics of spectrometer№Parameters nameValue1. Detector dimensions: ã diameter, mm ã thickness, mm50252.Relative efficiency (with respect to 3 ′′ x 3 ′′ NaI detector and Co-60source mounted 25 cm above the detector) at 1.33 MeV g-photon≥ 10%3.Energy resolution* ã for energy 122 keV, eV ã for energy 1.33 MeV, eV *  shaping time constant τ= 6   µ   s,   measurements with MCA 527 at input count rate 1000 cps ≤ 825≤ 18004.Peak shape ã FWTM/FWHM ã FW.02M/FWHM≤ 1.9≤ 2.655.Energy range of detector operation40 keV – 3 MeV6.Cooling time≤ 1.5 hours7.Dewar vessel volume0.6 l8.Battery operation time~ 8 hours9.Autonomous operation time at filled Dewar≥ 20 hours10.Touch screen ã Resolution, pixels ã Diagonal, cm800x40010.811.Overall dimensions, mm154 × 324 × 21712.Weight~ 5 kg13.The range of the operating temperatures ,° С from 0 to +4014.Preamplifier with resistive feed back with cooled FET.15.Preamplifier power ±12V with 9 pin connectors compatible with NIM standards.16.Alarm signal to shut down the HV: ã detector warm -0V; ã detector cold +5V. 4.2Built-in digital spectrometric device technical characteristicsAmplifier ã Coarse amplifier pre-filter with amplification in steps of 2-5-10-20-50, corresponding to a fullscale; ã ADC input range from 12V to 500mV; ã Input DC coupled, offset adjustable and depending on polarity of input signal; ã Linearity is better than 0.1 %.  Baltic Scientific Instruments 2 |  Page  ADC ã 14bit, 10 MSps; ã Integral nonlinearity is better than 0.05 %; ã Temperature stability TK 50. Digital signal processing ã Double differential trigger filter, or single differential low energy low count rate trigger filter; ã Pile-up-suppression, pulse pair resolution ~ 400 ns, depending on trigger filter; ã Automatic and manual adjustment of trigger threshold; ã Shaping time (Integration time / rise time of filter divided by 2) adjustable in the range 0.1 – 25µs; ã Flat top adjustable 0 – 5 µs; ã Fine adjustment of amplification in steps of ≤ 0.05 %; ã Channel splitting 128, 256, 512, 1k, 2k, 4k, 8k and16k; ã Differential non-linearity ≤ 1% for 4k channels and 1 µs shaping time; ã Base Line restorer with adjustable averaging; ã Optimum spectroscopic performance for 50 µs preamp decay time constant; ã PZC adjustment, detector decay time constants from 40µs to 1 ms can be compensated. 4.3Basic Spectrometry software  In search mode of operation a measurement of continuous spectrum is happening upon pushinga single button, information is updated every second. Dose rate is calculated from integral spectrumand is visualized on a display in μSv/h. In case of excess of dose rate over user defined thresholdinstrument produce visual and acoustic alarm. Energy calibration is available from a touch screen.Identification of radionuclides is performed according to library of radionuclides automatically. List of identified radionuclides and corresponding count rates with background deduction appears on thescreen. Depending on the categories each identified radionuclide is marked by different index andcolor: ã  Natural radionuclides are marked by N index, for example Th-232…N, and have green color; ã Industrial radionuclides are marked by I index, for example Co-60…I, and have blue color; ã Radionuclides used in medicine are marked by M index, for example F-18…M, and have redcolor; ã Illicit trafficking radionuclides are marked by UPu index, for example Am-241…UPu, andhave black color; ã Other radionuclides are not marked, for example Eu-152, and have grey-50% color.In advanced mode of operation user can select regions of interest in the spectrum or ratios of regions of interests and could calculate corresponding areas or ratios of areas.Energy calibration of NitroSPEC spectrometer, automatic radionuclides identification withcorresponding count rates and ROIs selection could be performed using touch screen.  Baltic Scientific Instruments 3 |  Page   Fig.1.   Operating window screen shot. 4.4SpectraLineGP analytical gamma spectrometry software The NitroSPEC could be easily connected to Laptop via wireless or wired communication for operation with SpectaLineGP software for analysis of spectra, identification of radionuclides anddetermination of their activities by commonly used methods. Software functions: ã Automatic peaks search with the required sensitivity level; ã Energy, and peak shape calibration; ã Peaks parameters determination — position, FWHM, area; ã Automatic radionuclides identification; ã Registration efficiency curves creation and radionuclides activities calculation; ã Saving of the measured spectra and processing results to database; ã Repeated measurements analysis; ã Simultaneous processing of several spectra, using several spectrum peaks from differentenergy intervals for the calibration by peaks shape; ã Calibration control by values and visually; ã User processing scenarios; ã Interactive processing of spectra intervals; ã Library of radionuclides; ã User-friendly interface. 4.5Tungsten alloy collimators Tungsten alloy is the composite of tungsten (90%), nickel (6%) and copper (4%). Collimation setrepresents a cup made from Tungsten alloy lined with 1.5 mm Cu mounted on the detection unit endcup. Internal diameter of cup is 64 mm. Cup has front window with diameter of 40 mm. Four removable collimators of same composition and thickness as a cup could be easily screwed up intocup. Collimators have windows with diameters of 5, 10, 15 and 25 mm. Thickness of cup walls is 7mm.Collimators are used for U enrichment measurements in UF6 cylinders.  Baltic Scientific Instruments 4 |  Page
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