Portable Borehole Loggers

Borehole Logging
Borehole Geophysical Logging

Geophysical Borehole Logging



  • Uranium Exploration and Evaluation
  • Groundwater Exploration and Development
  • Environmental and Geotechnical Studies
  • General Geologic Studies

Precise, Portable, Rugged, Versatile The Delta Epsilon family of portable borehole logging systems offers a combination of uncommon capability, ruggedness of design and ease of operation. Based on a legacy of building loggers in use around the world for more than four decades, a DEI borehole logging instrument is a superior working tool for the earth scientist and explorationist.

The Delta Epsilon portable borehole logging systems are available in two basic configurations, either as a 300 meter (1000’) depth capacity system or 600 meter ((2000’) depth capacity system. Both are complete Portable Borehole Logging Systems, and are supplied with permanent shipping and storage cases. As delivered, they are complete and ready to log including DELogger log acquisition software.

Either system features an integral data acquisition and uphole power unit. A PC laptop or notebook computer serves as the operator interface and to acquire, display in real time, store and playback borehole data as a function of the supplied DELogger software.

Computers are normally supplied by the purchaser, but DEI can provide a quote for an appropriate computer with DELogger software installed if desired.

The uphole data acquisition system supports an extensive group of digital downhole probes that facilitate the efficient and economical exploration of drill holes. These are particularly useful in both uranium exploration and groundwater development applications as Delta Epsilon is able to offer capabilities in these areas that are not available on competing systems.

For Uranium exploration applications Delta Epsilon offers calibrated gamma probes for the quantitative determination of %eU308. DEI is uniquely situated to provide calibration of gamma tools by virtue of our field office located at the Grand Junction, Colorado US Department of Energy borehole calibration models.

The use of total count gamma ray logging probes to determine Uranium resources in the ground is a long established practice. Gamma probes used for this objective must be properly calibrated to determine their efficiency and be assigned appropriate K or other calibration factors to determine an ore grade expressed as %eU308. DELogger software features the capability to automatically calculate and display %eU308 in real time from gamma logs.

Calibration is based on the assumption that observed count rate is proportional to ore grade when ore is expressed as a weight fraction of its host rock. This proportionality is valid only if a gamma probe is properly calibrated and appropriate correction factors are applied to the observed count rate.

DEI gamma tools have the unique capability to automatically correct for two major factors that otherwise introduce substantial error in ore grade assays from gamma logs. The first is deadtime and the second is for “Z-effect,” with soon to be introduced filtered gamma tools for applications requiring the assay of Uranium ores above .5%eU308.

Find out more about the 300 Series Logger or the 600 Series Logger, or read the rest of the details in our printable PDF Portable Borehole Loggers brochure

Please conact Delta Epsilon if you have questions or require additional information about our Portable Borehole Logging Systems or Water well logging equipment.