/ Nuclear radiation spectrometers

PURPOSE Qualitative and quantitave analysis of samples for gamma-emittinf radionyclides APPLICATION At dosimetric laboratories, environmental services, radiological laboratories of different ministries and departments – to analyze various environmental samples for presence of gamma-emitting radionuclides At radiochemical laboratories – to control technological processes At nuclear-physics centers – to carry out research in various fields of fundamental and applied physics OPERATION Operation of the spectrometer is based on conversion of the gamma quantum energy in the sensitive volume of the semiconductor detector into electric pulses of a proportional height with their subsequent recording and analysis by the multichannel pulse-height analyzer. The spectrometer allows selective and highly sensitive measurement of gamma radiation spectra in a wide energy range with a high resolution The spectrometer software allows: configuring of the system for various types of detectors control of the analyzer parameters, data collecting visualization of spectra and their processing results on the computer display energy, peak-shape, and efficiency calibration automatic processing of gamma spectra with identification of isotopes (by libraries) and determination of their activity storage of spectra and their processing results in files on any information carrier TECHNICAL DATA AND CHARACTERISTICS Detectable energies, MeV 0,05 - 10 Number of channels 8192 Integral nonlinearity, % 0,05 Maximal statistical input intensity, pulse/s 5 104 Energy resolution of the spectrometer (depending on the resolution of the detector used) for the 60Со 1332-keV gamma line, keV 1,8 - 3,5 Relative detection efficiency at the total gamma absorption peak for the 1332-keV line for a point 60Co nuclide at the source-detector distance 25 cm (depending on the volume of the detector used), % 10 Lowest 137Cs activity measured in a sample for 1 hour with using a protection screen, Bq 2 Activity measurement error for point geometry when a protection screen is used, % 20 Power consumption (220V, 50Hz), W 300 Operating temperature, oС 10...35 Protection screen wall thickness: steel 4 mm, lead 82 mm, copper 1,5 mm, cadmium 1 mm OVERALL DIMENSIONS AND WEIGHT OF MAIN SPECTROMETER COMPONENTS Complete component Overall dimensions, mm Weight, kg Shielding screen and detector with a Dewar vessel 650х570х1100 600 Pulse analyzer (computer, ADC, printer) Depending on the computer model Spectrometric device SU-03P (single unit) 375х350х85 4,6 Spectrometric device SU-04P (NIM crate with modules) 320х315х235 8,9 Spectrometric device SU-05P (Euromechanics crate with modules) 260х250х130 4,5 FEATURES The spectrometer hardware and software are easily configured and adapted for the work with various types of detectors (germanium ones of various energy ranges, resolutions, and efficiencies; silicon-lithium and silicon ones for detection of low-energy gamma radiation etc.). COMPONENTS Semiconductor germanium detector (HPGe or Ge(Li)) Charge-sensitive spectrometric preamplifier PUG-01 (external, for the Ge(Li) detector) Spectrometric device including a spectrometric amplifier, a high-voltage power supply, and a low-voltage power supply; one of the options below: Spectrometric device, standard Components Detector output voltage ratings Preamplifier output voltage ratings Input signal parameters Output signal parameters SU-03P, single unit   Polarity (+/–) 50 – 4000 V, 100 mА Automatic step-up/ step-down no more than 15 V/s ± 24 V ± 12 V Polarity (+/–) Rise time <200 ns Decay time constant >50 ms Polarity (+) Maximum amplitude 10 V Forming time constants 0,5; 1; 2; 4; 6; 10 ms SU-04P, NIM BNN-01 UIS-02 BNV-05 (or BNV-08) Polarity (+/–) 50 – 4000 V, 100 mА; (or 25 – 1000, 100 mA) Automatic step-up/ step-down no more than 15 V/s ± 24 V ± 12 V Polarity (+/–) Rise time <200 ns Decay time constant >50 ms Polarity (+) Maximum amplitude 10 V Forming time constants 0,5; 1; 2; 4; 6; 10 ms SU-05P, Euromechanics BNN-03 UIS-04 BNV-07 (or BNV-09) Polarity (+/–) 50 – 4000 V, 100 mА; (or 5 – 100 V, 100 mA) or 50 – 1000 V, 100 mA) Automatic step-up/ step-down no more than 15 V/s ± 24 V ± 12 V Polarity (+/–) Rise time <200 ns Decay time constant >50 ms Polarity (+) Maximum amplitude 8,2 V Forming time constants 2,6 ms Spectrometric amplitude-to-digital converter (ADC) selected for the type of interface and required characteristics from among the following: Type of ADC Design Interface Conversion method Conversion frequency, MHz (time, μs) Number of inputs Number of converters ADC-8К-2М PC circuit card ISA (16 bit) Wilkinson's 100 2 1 ADC-8К-W1 PC circuit card PCI Wilkinson's 100 1 1 ADC-8К-W2 2 2 ADC-8К-P1 PC circuit card PCI Successive approximations (3,5) 1 1 ADC-8К-P2 2 2 BPA-04 Euromechanics RS-232 RS-485 USB Wilkinson's 100 1 1 BPA-04N NIM RS-232 RS-485 USB ADC-USB-8К-W Stand-alone USB Wilkinson's 100 1 1 ADC-USB-8К-P Stand-alone USB Successive approximations (3,5) 1 1 ADC-RS-8К-W Stand-alone RS232/485 Wilkinson's 100 1 1 ADC-RS-8К-P Successive approximations (3,5) Personal computer of the IBM PC type with a printer Low-background combined lead shielding screen Applied software for Windows LSRM2000. Upon request, the spectrometer can be supplied with the UZ-01 reffiling unit

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