Radon anomalies above deeply buried uranium ore deposits: a model for long-distance vertical transport of radionuclides

This model can explain the claimed radon anomalies in soil gas above deeply buried uranium ore deposits.
  • Upward migration of formation fluids is a feature of sedimentary basins.

  • These formation fluids can carry in solution various members of the uranium decay series, including uranium, radium and radon.

  • Some of these members have very long half-lives (uranium-238 is 4.5 billion years, radium-226 is 1622 years), time to migrate in anomalous quantities to surface, where radon anomalies can develop.

  • In addition, in a two-phase system of water and a non-aqueous liquid (hydrocarbon), any radon present will partition preferentially into the non-aqueous phase. This phase is lighter than the water and, therefore, floats upwards and migrates to the surface faster, carrying the radon with it.

  • A major advantage of using radon is that is easy to measure quickly in the field.

  • We measure: radon - radium - thoron - radon daughters - alpha radiation.
  • The Lucas cell is recognized as the most sensitive and reliable method for these elements.
  • Intrinsically safe functions.
  • Sensitive to geochemical trace levels necessary for radon in lake water and for radon-thoron isotope ratios.
  • immune to beta and gamma radiation.
  • one monitor works with a number of (less expensive) detectors.
  • Our instruments are used around the world in exploration for uranium, oil & gas, groundwater and hydrothermal, and in environmental protection, health physics, earthquake prediction, and evaluation of hydrocarbon and NAPL contamination etc.
  • Same instruments used for radon and radium in soil, sediment, plant parts, rocks, water, soil gas, air, snow, food, and for radon and thoron daughters in air.
  • Winter and summer, from the Sahara Desert to the Canadian Shield, our instruments have faced up to severe field conditions.
  • In the radon business since 1968, our instruments are updated regularly with the most recent major re-design in 2015. Modern, low-power, field-rugged electronics. Some earlier versions still working after 40 years.
  • Continuous real-time monitoring and data recording.
  • RS232 port/pc software.
  • User programmable measurement intervals, sample and count periods and alarm level settings.
  • Can work in a tent without electricity or be carried from point to point in the field.
  • 50 readings per day. Results available immediately.
  • Portable. Rechargeable battery pack good for a long day in the field and recharges in a few hours.
  • Can be operated by junior personnel if carefully supervised.
  • EPA and CE Mark compliant.
  • Click here (www.finderschoice.com/rn) for more details of our radon instruments, and for other instruments, components and accessories we provide.
  • Technical specification sheets and pictures of our instruments provided on request.
  • Multilingual consulting and training (if required).
For instruments contact

Robert H. Morse, Ph.D., P.Eng.
September 15, 2008
Click here for technical details and other applications of our radon instruments.

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