What are Soil Radiometrics and how do I use them?
Soil radiometrics refers to the measurement and analysis of naturally occurring radioactive isotopes in soil. The three most common isotopes used in soil radiometrics are potassium-40 (K-40), uranium-238 (U-238), and thorium-232 (Th-232). These isotopes emit gamma radiation that can be detected using a gamma-ray spectrometer.
Geoscience Australia and the State and Northern Territory Geological Surveys have systematically surveyed most of Australia over the past 40 years using gamma-ray spectrometry in combination with airborne magnetic surveys. These surveys have been combined into a Radiometric Map of Australia, consisting of potassium, uranium and thorium grids of the continent at 100 metre resolution.
The calculation of soil radiometrics involves measuring the intensity of gamma radiation emitted by the soil and converting these measurements into estimates of the concentrations of the radioactive isotopes in the soil. This information can be used to create maps of the spatial distribution of these isotopes, which can provide valuable information about soil properties and processes.
Soil radiometrics can be used for a variety of purposes, including:
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Soil mapping: Soil radiometrics can be used to create maps of the distribution of different soil types and properties, such as clay content or soil moisture.
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Environmental monitoring: Soil radiometrics can be used to monitor changes in soil properties and processes, such as erosion or changes in soil moisture, which can be indicators of environmental change or degradation.
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Agriculture: Soil radiometrics can be used to assess soil fertility and nutrient content, which can inform decisions about fertilisation and other management practices.
Overall, soil radiometrics can provide valuable information about soil properties and processes, which can be used for a variety of applications in agriculture, mineral exploration, and environmental monitoring.