Portable geological survey with EGS-T200

Field teams running mineral and environmental radiometric surveys make their best decisions while they are still standing on the anomaly. When every spectrum has to come home for lab analysis, interpretation lags the survey by days — and ambiguous spots mean repeat visits to the same site, sometimes hours from the road.

The team needed laboratory-grade answers in the field: K, U and Th concentrations immediately after each acquisition, tagged with position, from an instrument that survives a full survey day on battery and does not wear the operator down on foot traverses.

The EGS-T200 integrates a 3″ × 3″ NaI(Tl) scintillation detector with integrated PMT, acquisition electronics, display, GPS, battery and storage into one field unit. Operators acquire on site and read K (%), U (ppm) and Th (ppm) immediately — each reading geotagged for direct transfer onto the survey map.

Energy resolution below 8% at 662 keV keeps the radio-element windows clean, and calibration survives the field: built-in Cs-137 reference with external K-40 source support, in both automatic and manual modes. At ≤4.0 kg with 8 hours of battery, it is genuinely a foot-survey instrument.