Exploration Technique: Radiometrics
|Exploration Technique Information|
|Exploration Group:||Remote Sensing Techniques|
|Exploration Sub Group:||Passive Sensors|
|Parent Exploration Technique:||Passive Sensors|
|Information Provided by Technique|
|Lithology:||Primary use is in mapping potassium alterations|
|Low-End Estimate (USD):|| 8.04804 centUSD |
8.04e-9 TUSD / mile
|Median Estimate (USD):|| 4,609.55460,955 centUSD |
4.60955e-6 TUSD / mile
|High-End Estimate (USD):|| 16,000.001,600,000 centUSD |
1.6e-5 TUSD / mile
|Low-End Estimate:|| 0.05 days1.368925e-4 years |
0.00164 months / 10 mile
|Median Estimate:|| 1.12 days0.00307 years |
0.0368 months / 10 mile
|High-End Estimate:|| 4.02 days0.011 years |
0.132 months / 10 mile
|Cost/Time Dependency:||Location, Size, Resolution, Terrain, Weather, Permitting Restrictions|
Radiometric Surveying is widely used in geologic mapping, soil surveying, mineral exploration, and lithologic studies. It is a surface mapping technique, penetrating only the top 50 cm or so of the earth's surface. The basic purpose of radiometric surveys is to determine either the absolute or relative amounts of U, Th., and K in the surface rocks and soils.
Radiometric surveys can be used for a number of applications. In geothermal exploration, two types of of maps are typically created:
- geological mapping (mineral, water features, paleodrainage systems)
- potassium alteration mapping
- Data can be processed to produce maps of K, eU and eTH
- Because this techniques maps surface feature, it is important to have a solid understanding of surface processes (e.g. weathering) and the interaction of these processes with bedrock.
- Disequilibrium in the U decay series can be a significant source of error. Estimates of U concentrations are based on the assumptions of equilibrium conditions, which is not necessarily the case.
- The environment can also affect fluence rates. Gamma rays attenuate exponentially with distance from the source. Vegetation and soil moisture can adversely affect the estimates of the surface concentrations of the radioelements.
- "[http://www-pub.iaea.org/mtcd/publications/pdf/te_1363_web.pdf Guidelines for Radioelement Mapping Using Gamma Ray Spectrometry Data]"
- Chena Geothermal Area
- Fort Bliss Area
- Lightning Dock Geothermal Area
- Reese River Area
- Roosevelt Hot Springs Geothermal Area
- Salt Wells Geothermal Area
- Salt Wells Area
- Silver Peak Area