Radon in soil gas finds subsurface uranium mineralization in areas of over 99% outcrop

  • The Radiore deposit, near Rayrock, lies beneath a hilltop with almost 100% outcrop.
  • We were initially puzzled as to how to use radon in soil gas to explore through solid rock.
  • Making a hole in solid rock would be difficult, moreover, radon would not migrate from the rock into the sample hole, and would not migrate any distance from the target to the sample site.

  • Soils suitable for radon exploration are confined to gullies, which represent fractures in the rock which in turn are loci of uranium mineralization.
  • In all cases the soils are rocky and shallow and the survey was attended by some difficulty.
  • The maps are missing from the assessment files, but we can include a description here.
  • The strongest radon anomaly occurs in an area where where uranium mineralization was intersected in three adjacent diamond drill holes. At this point a radon value of 1004 counts per minute was observed along with several lower though still anomalous values.
  • A second anomaly, with two radon values over 100 cpm occurs over a different area of drill-intersected uranium.
  • These intersections detected by radon were 50 feet deep.
  • In no case were gamma (scintillometer) readings anomalous.
  • In surveys of this type it is important to separate out the thoron from the radon readings.

  • We measure: radon - radium - thoron - radon daughters - alpha radiation.
  • The Lucas cell is recognized as the most sensitive and reliable method for these elements.
  • Our instruments are used around the world in exploration for uranium, oil & gas, groundwater and hydrothermal, and in health physics, earthquake prediction, and evaluation of hydrocarbon and NAPL contamination.
  • In the radon business since 1968, our latest major instrument update was 2011.
  • Modern, low-power, field-rugged electronics. Some earlier versions still working after 35 years.
  • Winter and summer, from the Sahara Desert to the Canadian Shield, our instruments have faced up to severe field conditions.
  • Sensitive to geochemical trace levels necessary for radon in lake water and for radon-thoron isotope ratios.
  • Can work in a tent without electricity or be carried from point to point in the field.
  • 50 readings per day. Results available immediately.
  • 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.
  • Same instruments used for radon and radium in soil, sediment, plant parts, rocks, water, soil gas, air, and snow, and for radon daughters in air.
  • Click here for pictures of instruments.
  • Click here for or other instruments, components and assessories we provide
  • For instruments contact
    R.H. Morse & Associates Ltd.
    skype: robert.morse.toronto
  • Multilingual consulting and training (if required).
Robert H. Morse, Ph.D., P.Eng.
October 18, 2007
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