front of working face - geoelectric prospecting method
- gamma-gamma density logging
- gamma-gamma log
- gamma-gamma logging
- gamma-neutron log
- gamma-radiation detection
- gamma-ray counting rate
- gamma-ray data
- gamma-ray density log
- gamma-ray density logging
- gamma-ray detection
- gamma-ray detector
- gamma-ray device
- gamma-ray energy
- gamma-ray log
- gamma-ray logging
- gamma-ray logging instrument
- gamma-ray logging tool
- gamma-ray radiation
- gamma-ray sensor
- gamma-ray source