- 2026-01-26
Medusa Radiometrics and Seequent: Advancing Radiometric Processing for Modern Gamma-Ray Sensors
(This article is based on and inspired by the radiometrics workflow update released by Seequent for Oasis montaj 2025.2.)
At Medusa Radiometrics, we design and manufacture lightweight, high-performance gamma-ray sensors for ground, airborne, and UAV-based surveys. As sensor technology evolves, the way radiometric data are processed must evolve as well. That is why we worked closely with Seequent on the development of the new radiometrics workflow introduced in Oasis montaj 2025.2.
Traditional radiometric processing tools were created for older detector systems with limited spectral resolution. Modern sensors now produce spectra with hundreds to thousands of channels, enabling more detailed analysis but also requiring more advanced and transparent processing methods. Our collaboration with Seequent focused on ensuring that Oasis montaj can fully support these modern datasets in a practical and scientifically sound way.
The new workflow provides a structured sequence of correction and quality-control steps, including energy calibration, background and cosmic corrections, radon and altitude adjustments, dead-time correction, spectral window definition, and the calculation of elemental concentrations. Each stage includes visual checks so users can assess data quality and processing effects as the workflow progresses.
An important addition to the workflow is NASVD (Noise-Adjusted Singular Value Decomposition) smoothing, which helps distinguish genuine geological signal from noise. This is particularly valuable for high-channel-count sensors and for datasets collected with UAV platforms, where signal-to-noise ratios can vary significantly.
These developments make it easier to process radiometric data consistently and reliably for applications such as mineral exploration, soil and regolith mapping, environmental monitoring, and contamination assessment. By aligning modern sensor capabilities with modern processing tools, users can extract more meaningful geological information from their surveys.
Our contribution to this collaboration was driven by our experience developing compact, robust gamma-ray sensors optimized for real-world field conditions. Working with Seequent has ensured that Oasis montaj now offers radiometric workflows that reflect the needs of today’s radiometric instrumentation and the users who rely on it.
