Ground GeophysicsRadiometrics

In late 2008 GPX Surveys introduced a ground radiometric system. The system uses a Pico Envirotec GRS-2 portable spectrometer which is similar to the GRS-10+ spectrometer used in our airborne systems. The unit is mounted on a quad bike and has full data acquisition with real-time monitoring and GPS navigation and positioning.

Please click here for a flyer about ground radiometric surveys.

APPLICATIONS

Ground radiometric surveys can be used to rapidly map and target radioactive elements. The system is designed for detailed surveying with high resolution results provided by the large NaI crystal detector volume (4 litres) and a short detector-to-ground separation (1 metre). This makes it ideal for the acquisition of fast and reliable ground surveys or monitoring of larger areas where radioactive materials may be buried. Please click here for a flyer about our uranium exploration techniques.

TECHNIQUE

Areas of interest are identified from airborne radiometric data in conjunction with geological investigations. A grid survey is created which the quad bike drives over to map the total radiometric count, potassium, uranium and thorium concentrations.

EQUIPMENT SPECIFICATIONS

The spectrometer used is a Pico Envirotec GRS-2 portable spectrometer (PGIS-SP) with a 4 litre crystal pack.

Specifications
Recorded Spectra:	256/512 channel individual detector spectra
Data Sampling:	1 second sample rate
Energy Spectra	36 keV to 3 MeV
Cosmic:	Energies above 3 MeV are detected as Cosmic Rays
Max. count rate:	1,000,000 per second (65,535 per channel)
Spectra Correction	Automatic gain control on individual detectors
Dead time:	Negligible for normal detection rates
Configuration:	4 litres