The spectrometer AirSPEC is a monoblock unit, comprising connectors, outputs and hardware for data transfer. Inside of the spectrometer housing has scintillation detector NaI(Tl) inside, photoelectronic multiplier (PMT), spectrometric stabilization system, HV converter, amplifier, multichannel pulses analyzer (MCA) and processor unit. The spectrometer is placed into thermostabilising and damp proof housing.
AirSPEC measurement system is autonomous and automated. Operator is able to access the spectrometer remotely through Ethernet, able to execute the analysis of the measured spectra using modern and full-featured software.
Example of order code : "AirSPEC-N76-M-A"
[N76] – type and size of detector : ‘N’ – NaI(Tl) ; ‘76’ - Ø76x76mm.
Types of detectors: ‘N’ – NaI(Tl); ‘L’ – LaBr3(Ce); ‘C’ – CeBr.
[M] – monitor.
[W] – winch.
[A] – alarm console.
|Detector type||NaI(Tl) Ø51x51mm|
|Measured energies range, keV||50 - 3000|
|Relative energy resolution on the line 661,7 keV, measuring with radionuclide source 137Cs, %, no more than||8|
|Detection efficiency of the gamma-radiation in the full energy peak of radionuclide 137Cs, with energy 661,7 keV at a distance of 50 mm from the upper surface of detector, %, at least:||1,2|
|Integral nonlinearity in the gamma energy range from 50 to 3000 keV,%, not more then||± 1|
|Maximum throughput, cps, no less than||5∙104|
|Range of the measurements of specific effective activity for NORM, Bq/kg Expanded uncertainty U=20 %, k=2||50 - 20000|
|Range of the measurements of mass fractions of NORM in rocks, % 40K U (226Ra) 232Th Expanded uncertainty U=30 %, k=2|
0,5 – 15%
0,0005 – 0,05 %
0,0005 – 0,10 %
|Range of the measurements of surface activity of 137Cs, kBq/m2 Expanded uncertainty U=20 %, k=2||2 - 5000|
|Channels quantity in the spectrum||1024, 2048|
|Operation conditions Ambient air temperature, 0С Air relative humidity, % Atm.pressure in the range, kPа Intensity of magnetic fields of the permanent and variable grid frequencies, А/m|
-30 ÷ +60
up to 100
84 ÷ 106,7
up to 40
|Data transfer interfaces||Ethernet, RS-485, USB|
|Overall dimensions, mm : spectrometer interface unit||Ø140x330 40x130x150|
|Shell protection level||IP68|
|Inner Software functions: spectra measurement and record; identification of radionuclides in accordance to the library list; calculation of activity, volumetric activity, MDA, dose rate; count rate measurement in regions of interest (ROI); sensors polling and obtained parameters record; indicators response for the specified conditions is provided.|