D epending on the source of the radiation, barometric pressure might be a variable. Radon can influence radiometric readings such that high pressure might suppress gamma counts or low pressure might enhance the number of counts. I deally radiometric surveys should be run over flat featureless terrain or areas with few outcrops or lithologic changes. Difficulty of interpretation is proportional to the ruggedness of the topography making it harder to discern seepage anomalies from those related to lithology. Changes in radiometric response can also be attributed to road surface changes, outcrops, drainages, road cuts, and road fill.
Keen observation is the key to culling the false anomalies from the seepage anomalies.
R adiometric surveys can be run as a continuous profile or as discrete points. Traverses run as continuous data can yield a considerable amount of detail with regard to signal character by showing the location of faults and fractures, radiation halos, and traditional seepage anomalies. Though the character of the signature is missing, the discrete points yield a more visual interpretation of the spatial extent of the radiometric highs and lows. As with any survey, the greater the sample density the better the interpretation. R adiometrics is a first wave culling tool for reconnaissance geochemical surveys.