Radon and radon-thoron ratios can help indicate distance of glacial transport of radioactive material.

  • Airborne and ground gamma-ray and gamma-ray spectrometer surveys find "boulder trains", trains of radioactive material transported "down-ice" from bedrock sources.
  • Boulders are commonly transported further than finer material. Also, as transport distance increases, finer material is mixed with other non-radioactive fine material. The radioactivity is diluted and not easily detected.
  • High values of radon and radon-thoron ratios are due to radioactivity in fine grained material (local).
    High gamma-ray values are more likely due to larger chunks and boulders (distant).
  • Just west of the Midwest Lake deposit boulders of radioactive pegmatite are exposed on the top of an esker. These boulders give an airborne gamma-ray anomaly that is unrelated to the Midwest deposit and far down ice from the bedrock source. The real boulder train, which led to the discovery, is immediately south, "down-ice" of the Midwest deposit. The radioactive boulders here are angular, friable and weathered, and visual inspection reveals that they have not travelled far. This valuable boulder train contains sufficient fine-grained radioactive material to give a strong radon anomaly, reinforcing the conclusion that the bedrock source was not far "up-ice".
  • When examining these glacial dispersion trains by soil geochemistry, we expect that, at least in the case of organic soils, radium would give a better indication of nearby uranium mineralization than would uranium. Radon in soil gas would, in turn, reflect the radium content of the soil.

  • 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 environmental protection, health physics, earthquake prediction, and evaluation of hydrocarbon and NAPL contamination.
  • In the radon business since 1968, our latest major instrument update was 2015.
  • Modern, low-power, field-rugged electronics. Some earlier versions still working after 35 years.
  • Continuous real-time monitoring and data recording.
  • Winter and summer, from the Sahara Desert to the Canadian Shield, our instruments have faced up to severe field conditions.
  • Intrinsically safe functions.
  • 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.
  • EPA compliant.
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  • Technical specification sheets and pictures of our instruments provided on request.
  • Multilingual consulting and training (if required).
For instruments contact
R.H. Morse & Associates Ltd.
skype: robert.morse.toronto

Robert H. Morse, Ph.D., P.Eng.
January 27, 2010
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