In civil engineering, gamma-ray mapping is used to characterise subsurface conditions and detect material variability before and during construction. This reduces risk, improves planning accuracy, and can lower costs compared to extensive drilling or trenching programmes.
Typical civil engineering applications include:
- Road and railway corridor surveys – Identifying zones of varying soil composition, peat layers, or clay pockets that affect load-bearing capacity.
- Embankment and levee assessment – Mapping soil variability to detect weaknesses or seepage pathways.
- Dredging and sediment characterisation – Mapping the composition of sediments in ports, waterways, or coastal zones.
- Site investigation support – Using gamma-ray data to guide borehole placement and optimise sampling programmes.
The technique is particularly valuable in linear infrastructure projects where rapid, continuous coverage of long corridors is needed. Surveys can be completed in a fraction of the time required by conventional ground investigation methods.
