/ Nuclear radiation detectors

PURPOSE           Measurement of gamma radiation energy and accumulation of the registered information as statistical distribution of energy (spectra) and its wire or wireless transfer to a computer for further processing. APPLICATION           Building of spectrometric systems for laboratory and industrial application for qualitative and quantitative analysis of gamma emitting radionuclides. COMPONENTS Detector: NaI(Tl) or LaBr3(Ce)* crystal; Photomultiplier tube (PMT); Spectrometric path with signal digital processing; LED system for path stabilization; Voltage converters for power supply of electronics and PMT; Processor and spectrum memory; RS-485 and RS-232 interface for connection with computer, modification with Bluetooth air channel; Embedded battery and charger. FEATURES Digital processing of analog signal ensures increase of intensity and stability of the device parameters; Application of LaBr3(Ce) crystals allows manufacturing of scintillation spectrometers with high energy resolution; Power supply of the device from external power converter or embedded battery; Wireless option for connection with a controlling computer. TYPE AND SIZE OF DETECTOR           Standard UDS-GCA models use Ø40х40 and Ø63х63 mm3 NaI(Tl) scintillation crystals, as well as Ø38х38 mm3 LaBr3(Ce) crystals.* BASIC SPECIFICATIONS Parameter NaI(Tl) LaBr3(Ce) Range of detected energies, MeV ( 0.05 – 3) Relative energy resolution for the 662-keV line (137Cs) , %, not exceeding 8 3.5 Integral non-linearity, %, not exceeding 1 Parameters of digital filter kernel, μsec Front 0.8 Flat top 0.2 Number of accumulated spectrum channels 1024 Accumulated spectrum channel capacity 232 - 1 LLD adjustment range, spectrum channels 1-1000 LLD adjustment step, spectrum channels 1 Maximum input statistic intensity, cps, not less than 1,5*105 2,5*105 Relative change of the resolution for the 662-keV (137Cs) line at the maximum intensity, %, not exceeding 15 Relative displacement of the 662-keV (137Cs) peak at the maximum intensity, %, not exceeding 1 Time instability over 24 hours of continuous operation, %, not exceeding 1 Additional conversion characteristic instability due to temperature variation, %/ 0С, not exceeding 0.1 Power supply voltage, V External 5 ± 10% Internal battery (rated) 3.6 Max consumed power, W With internal power supply 0.7 With external power supply 1.3 Battery parameters Type NiMH (3шт. АА) Capacity, mAh, not less than 2500 Time of continuous operation when powered by battery, h, not less than 8 Ingress protection IP54 Range of operating temperatures, 0С ** +5 to + 40 PARAMETERS OF UDS-GCA INTERFACES FOR CONNECTION TO A COMPUTER RS-232/485 Interface Protocol for serial data transmission ModBus RS-485 serial transmission rate, bit/s 9600-115200 Number of devices connected to one RS-485 bus, not more 31 Type of connector for connection to a computer DB-9 Type of connection Connector Galvanic isolation No Bluetooth wireless interface Compliance with Bluetooth specification version 1.2 Range, m, not less than 10 Typical range within direct visibility, m 30 DESIGN MODIFICATIONS, DESIGNATIONS AND TYPICAL OVERALL DIMENSIONS Name Crystal Interface Length Diameter Weight UDS-GCA–40x40–RS NaI(Tl) Ø40х40 RS-485/232 390 mm 79 mm 1.7 kg UDS-GCA –40x40–RS/BT1 NaI(Tl) Ø40х40 RS-485/232/BT 390 mm 79 mm 1.7 kg UDS-GCA –63x63–RS NaI(Tl) Ø63х63 RS-485/232 440 mm 88 mm 2.8 kg UDS-GCA –63x63–RS/BT1 NaI(Tl) Ø63х63 RS-485/232/BT 440 mm 88 mm 2.8 kg UDS-GCA –В380–38x38–RS LaBr3(Ce) Ø38х38 RS-485/232 390 mm 79 mm 1.7 kg UDS-GCA –В380–38x38–RS/BT1 LaBr3(Ce) Ø38х38 RS-485/232/BT 390 mm 79 mm 1.7 kg NOTES           *Upon request, other detecting devices with scintillation crystals of other types and sizes can be manufactured.           **Upon request, detecting units with a wider temperature range can be manufactured.

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