Borehole Gamma Spectrometer

DESCRIPTION

Borehole Gamma Spectrometer is used for:
  • Determination of underground orientation of transuranium ores in their natural beddings (headings, mines, boreholes)
  • High precision gamma-spectrometry of radionuclides at inspection of sea bed, water sealed mines, water filled boreholes, radionuclide migration in groundwater
  • Gamma-spectrometry at neutron-activation method of substance analysis

Description

Application

Borehole Gamma Spectrometer is used for:

  • Determination of underground orientation of transuranium ores in their natural beddings (headings, mines, boreholes)
  • High precision gamma-spectrometry of radionuclides for inspection of sea bed, water sealed mines, water filled boreholes, radionuclide migration in groundwater
  • Gamma-spectrometry using the neutron-activation method of substance analysis

COMPLETE SET

Borehole Gamma Spectrometer consists of: A. Spectrometric probe

  • Spectrometric gamma-radiation detection unit based on HPGe detector with built-in preamplifier of signals.
  • cooling system options:
    • Cryoaccumulator
    • Stirling cycle cryocooler
    • Liquid nitrogen
  • Spectrometric device
  • Protective housing
  • Well-logging borehole connection cable

B. Ground workstation

  • Data processing and analysis software SpectraLineGP
  • Personal computer
  • Borehole cable and connectors set

SPECIFICATION

Parameter Value (Cryoaccumulator) Value (Stirling cryocooler) Value (Liquid nitrogen)
Relative efficiency (with respect to 3’’ x 3’’ NaI detector and Co-60 source mounted 25 cm above the detector) at 1.33 MeV g-photon* 10 % 10 % 10 %
Resolution at 122 KeV at 103 s-1 Resolution at 1.33 MeV < 1000 eV < 1.9 keVo < 1.5 keV < 3.2 KeV < 1000 eV < 2.00 keV
Energy range of detector operation 100 keV – 3.5 MeV 100 keV – 3.5 MeV 100 keV – 3.5 MeV
Diameter of protective housing 65 mm 80 mm 70 mm
Length of Borehole Probe 1450 mm 1250 mm 1550 mm
Cooling time < 10 hours < 12 hours < 8 hours
Autonomous operation time > 8 hours > 15000 hours > 10 hours
* – Borehole detection unit could be equipped with HPGe detector with efficiency up to 40%.