SPECTRA - Search dosimeter-radiometer MKS-11

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MKS-11 “Spectra” search dosimeter-radiometer is designed to measure ambient dose equivalent rate of gamma and X-ray radiation (hereinafter called photon-ionizing radiation DER), to determine neutron radiation intensity, as well as to identify gamma radionuclides. The device provides accumulation, saving in the non-volatile memory and identification of amplitude gamma spectra.

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The device is used to detect and localize radioactive and nuclear materials relative to their gamma and neutron radiation with the aim to prevent illicit transfer of these materials. It is also used at enterprises and organizations dealing with gamma and neutron radiation sources.


  • High sensitivity gamma scintillation (CsJ) detector, Geiger-Muller counter, scintillation (LiJ) detector of neutron radiation.
  • Mode of indication and automatic testing of batteries residual capacity.
  • Data communication between the detecting device (DD), the control and indication device (CID) and the PC is done via Bluetooth wireless technology.
  • Option to save and transfer to personal computer 128 full gamma radiation spectra.
  • Identification of radionuclides with indication of the category that they belong to (in compliance with IAEA requirements):
  • medical radionuclides: 18F, 67Ga, 99mTc, 111In, 123I, 131I, 201Tl;
  • industrial radionuclides: 57Co, 60Co, 133Ba, 137Cs, 192Ir, 152Eu and 241Am;
  • special nuclear materials: 233U, 235U, Pu [reactor-grade plutonium (more than 6%240Pu)];
  • naturally occurring radioactive materials: 40K, 226Ra, 232Th and daughters, 238U and daughters.

Note: The list of nuclides that can be detected by the device can be enlarged if needed.

  • Threshold alarm system with three independent threshold levels:
    • search threshold level (threshold level of pulse count rate from the detector of photon-ionizing radiation);
    • safety threshold level (threshold level of photon-ionizing radiation DER);
    • threshold level of pulse count rate from the detector of neutron radiation.


- Gamma radiation sensitivity for 137Cs, not less than (pulse/s)/(µSv/h) 100±15
- Neutron radiation sensitivity for: 
- fast neutrons, not less than 
- thermal neutrons, not less than
pulse*centimeter² / neutron
- Measurement range of photon-ionizing radiation DER µSv/h 0,05 - 9999
- Indication range of photon-ionizing radiation count rate pulse/s 1 - 9999
- Indication range of neutron radiation count rate pulse/s 0,01 - 9999,00
- Main relative permissible error limit of photon-ionizing radiation DER measurement (137Cs) % ±(15+1/H*(10)), where H*(10) - is a measured value of DER, equivalent to µSv/h
- Energy range of detected photon-ionizing radiation MeV 0,033 - 3,000
- Energy dependence of the device readings at photon-ionizing radiation DER measurement in the energy range from 0.05 to 1.25 MeV relative to 0.662 MeV energy (137Cs) % ±25
- Energy range of detected neutron radiation MeV from thermal neutrons to 14.00
- Number of channels of amplitude gamma spectrum channel 1024
- Time of operating mode setting of the device, not more than min 1
- Calibration time relative to gamma background s 2 - 60
- Time of continuous operation when powered from charged storage batteries under normal gamma background (not more than 0.5 ?Sv/h), with switched off display backlight and no alarm, not less than h 30
- Operating temperature range °ะก - 20 ... + 50
- Dimensions of the detecting device (DD), not more than mm 110x36x83
- Weight of the DD, not more than kg 0,4
- Dimensions of the control and indication device (CID) without strap, not more than mm 70x80x32
- Weight of the CID, not more than kg 0.13
- Weight of the device kit in packing case, not more than kg 1,5



  • Control and indication device
  • Detecting device
  • NiMH storage battery of AA size
  • NiMH storage batteries of AAA size (2 pcs.)
  • Battery charger
  • Leather case
  • Screwdriver
  • Operating manual
  • Packing


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