Soil and snow radon anomaly over Faraday Mine, Bancroft, Ontario

  • The anomaly is shifted downhill, as is normal in geochemical soil surveys.
  • Going downhill from the ore (pegmatite) the first response is shown by radon in snow.
  • The next response is shown by radium in the A and B horizons, and by uranium in the B horizon.
  • The response of uranium in the A horizon is further downhill.
  • At the bottom of the hill in a swampy area at the spring all indicators are high. High radon values in snow here are due to high radium values in the underlying soil.
  • Our instruments have the advantage of instant results at the sample site, with the possibility of immediate follow-up and checking.
  • Our instruments also determine thoron, and the Rn/Tn ratio is important in recognising false anomalies due to soil permeability.

  • 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 ( 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.
June 11, 2012
soil geochemistry and radon in snow, 
Faraday Mine, Bancroft
Click here for technical details and other applications of our radon instruments.

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