Radiometrics Brochure

RADIOMETRICSTHE AEROQUEST AIRBORNE GAMMA RAY SPECTROMETER (AGRS) system consists of a RSX-5 sensor pack designed and manufactured byRadiation Solutions Inc. The system has 4 downwardlooking NaI crystals (16.8 Litres – 1024 cu.in.) used as the main sensors and 1 upward looking crystal (4.2 Litres – 256 cu.in.) for monitoring non-geologicsources. The system features automatic peak detectionand real-time calibration to ensure spectrum stabilityand a high quality final product. The full spectrum isrecorded at a sample rate of once per second (256 or512 channels) to allow for subsequent noise reductionprocessing such as NASVD. The data are processed toproduce the standard IAEA ROI channels – Total Count,Potassium, Uranium and Thorium. The potassium,and equivalent uranium and thorium concentrationsare also derived and ratios of these concentrationsare computed to enhance the interpretation of the survey results. The radiometric data provide information on the lithologic characteristics anddistribution of the overlying geologic materials. The depth of measurement is on the order of 30 cmand the circular area measured by the spectrometerhas a diameter equal to approximately four times the altitude of the helicopter above the ground.When combined with a magnetic sensor the AGRSsystem is even a more powerful mapping tool.Aeroquest has developed 3 generations ofAeroTEM systems and has been continuously refiningthe designs as an exploration tool that is optimized to provide the maximum amount of information onthe target application. The combination of resolution,conductance discrimination, and geometric informationresults in a system with a wide applicability.Airborne Gamma Ray Spectrometerfor Uranium and Gold Exploration and Geologic MappingRADIOMETRICSAirborne Gamma Ray Spectrometer for Uranium and Gold Exploration and Geologic MappingAeroquest International7687 Bath Road, Mississauga ON L4T3T1Phone +905 672 9129Toll free +866 693 9129Fax +905 672 7083Email sales@aeroquest.caWeb site www.aeroquest.caCalgary +1 403 450 9621Vancouver +1 604 676 9648Pretoria +27 12 332 3320Perth +61 8 9479 4232The AEROQUEST International Group of CompaniesSpectra Resolution: 256 or 512 channelsData Sampling: 1.0 seconds and longer, 0.5 seconds optionalEnergy Spectra:50 keV to 3 MeV with threshold adjustable from 50 keV to 300keV. All energiesabove 3 MeV are detected as cosmic raysAnticoincidence:To improve the peak-valley ratio on lower energies, coincidental pulses detectedamong neighbouring detectors are removed and placed in a special channelSpectra tracking: Individual detectors with recorded status of tuningTime to stabilization:Automatic on natural radio nuclei – usually less than 30 sec on the ground and lessthan 2 minutes in the air at 100 m altitudeSpectra linearization: Automatic after system calibrationWindows (ROIs):Additionally to the full spectra up to 22 special windows can be collected (4 areIAEA standard windows, 8 are optional activities altitude related )Signal sampling: 20 MHz by an internal 12bit A/D for each detectorPeak detector: Digital - time resolution 50 nsecDead time: Negligible for up to 60,000 pulses/sec/detectorPulse rate per detector: > 60,000 pulses per second with negligible dead timeChannel capacity:65,500 counts/sampling period