A new era for radiometric data processing in Oasis montaj

Modern airborne and drone radiometric surveys are producing increasingly rich spectral datasets, yet many geoscientists still face the same practical challenge: how do you move confidently from raw spectral measurements to reliable, interpretation-ready products?

This hands-on SAGA workshop introduces a modern, structured approach to radiometric data processing in Oasis montaj, aligned with industry best practice and designed for today’s high-resolution datasets. Participants will follow a complete end-to-end workflow, transforming raw spectral data into robust geological products suitable for interpretation, modelling, and reporting.

Developed through a collaboration between Seequent and Medusa Radiometrics, this next-generation workflow addresses the increasing complexity of modern radiometric surveys. Rather than focusing on software buttons and black-box processing, the workshop emphasizes understanding the reasoning behind each step so that participants can make informed decisions throughout the processing chain.

Radiometric processing is often treated as a collection of isolated correction steps, which can make it difficult to understand how decisions made early in the workflow influence final interpretation of products. This workshop is designed to help participants:

• Build confidence in processing radiometric datasets from raw spectra through to final deliverables.
• Understand why each correction is applied and the consequences of applying corrections incorrectly.
• Learn how to preserve valuable spectral information while reducing noise.
• Produce quality-controlled, traceable, and reproducible outputs suitable for reporting and future reprocessing.
• Gain exposure to practical implementation in Oasis montaj, supported by scientific insight from Medusa Radiometrics.

A highlight of the workshop is a guest expert session by Han Limburg, Principal Scientist and Founder of Medusa Radiometrics, who will share perspectives on modern radiometric processing, calibration philosophy, industry best practice, and future trends in airborne and drone radiometrics.

By the end of the workshop, participants will be able to:

1. Understand the complete radiometric workflow Follow the full processing pathway from raw spectra to interpretation-ready products and understand how each stage influences the final result.

2. Prepare and quality-control radiometric data Import, validate, inspect, and assess radiometric datasets to identify acquisition and survey issues early in the workflow.

3. Apply spectral smoothing using NASVD Use Noise-Adjusted Singular Value Decomposition and eigenvalue analysis to reduce noise while preserving meaningful geological signal.

4. Extract radioelement products Generate potassium, uranium, thorium, and total count products while understanding the impact of spectral quality on the extracted results.

5. Apply filtering and stabilisation workflows Implement filtering approaches that improve data quality while preserving geological integrity.

6. Apply corrections in the correct sequence Work through aircraft and cosmic background, atmospheric radon, altitude, dead-time, and Compton stripping corrections.

7. Generate interpretation-ready products Create %K, eU, eTh, ratio products, and ternary images suitable for exploration and geological interpretation.

8. Apply continuous quality control Use QC as a diagnostic tool throughout the workflow rather than as a final validation step.

9. Create traceable and reproducible deliverables Produce datasets and workflows that can be revisited, audited, and reprocessed with confidence.

• Geophysicists working with airborne, ground, or drone radiometric surveys.
• Exploration geologists who use radiometric products to support mapping and targeting.
• Data processors seeking a more structured and defensible radiometric workflow.
• Researchers and students interested in modern gamma-ray spectrometry applications.
• Geoscience professionals looking to improve confidence in radiometric interpretation and data quality.

• A laptop that meets the Oasis montaj system requirements. View system requirements

Provided by Seequent

• Temporary Oasis montaj training licences
• Radiometric training datasets
• Guided exercises and workflow materials

Basic familiarity with Oasis montaj is recommended but not essential. The workshop is designed to guide participants through the workflow step by step.