Spectrometer SPECTROBOT
Serial number: S2AA3478
Crystal parameter: NaI(Tl) / Ø 76 mm х 76 mm
Energy resolution: $FWHM_{662 keV}$ $^{137}Cs$ = 43 keV
Detector type: scintillation detector with the PMT
Detector unit: SCIONIX 76B76/3M
PMT type: ETL 9305
Dimensions of the inner chamber: for a disk-shaped sample, the maximum dimensions are 133.5 mm in diameter and 48.3 mm in height
Energy resolution: not lower than 7.5% (ANSI/IEEE Std 325-1996)
Real energy resolution: 6.5%
Low-Background Detection Unit
The low-background detection unit is intended for measuring samples of the following types:
— samples “AFA Filter” made of analytical aerosol filters AFA with a diameter of 52 mm used in different ventilation systems of an NPP;
— samples “Water Sample” made of the samples of NPP liquid disposals packed in measuring containers, Marinelli vessels, with a capacity of 0.5 L.
The low-background detection unit comprises the spectrometer module and the low-background shielding chamber.
Spectrometer module
The spectrometer module is designed for measuring gamma-ray spectra of the “AFA Filter” and “Water Sample” samples.
The module consists of the scintillation detection unit integrated with the unit of the digital spectrometric processor and the source of PMT high-voltage supply. The power is supplied to the spectrometer module by a PC via the USB interface.
Unit of the digital spectrometric processor and the source of PMT high-voltage supply
Processor type: digital
Number of channels: 256–16384 (programmable)
Input power: $10^5$ pulses/sec
Availability of the digital flexibility filter
Availability of the “Digital Oscilloscope” mode
Possibility of detecting and imaging background spectra in the “Digital Oscilloscope” mode
Type of the interface for connection to the control unit: USB-2
The performance of the unit can be guaranteed, providing the length of the cable is no less than 4 m
PMT high-voltage supply: 750 V
Serial number: 17-08-26-02
Low-Background Shielding Chamber
The characteristics of the low-background shielding chamber should ensure the possibility of measuring the “AFA Filter” and “Water Sample” samples.
Main structural material: lead
Minimum thickness of the absorbing lead layer: 90 mm
Background counting rate in the energy range of 50–3000 keV with the dose rate indoors no more than 15 μR/h: no more than 3 pulses/sec
Mass: no more than 450 kg
Overall dimensions: no more than 500 x 500 x 750 mm
