Midwest Lake
Radon in surface water

  • Note the high radon values near the orebody and low values elsewhere.
  • The radon anomaly was confirmed in 3 different summers by 3 different operators, all before the orebody was discovered by drilling.
  • First (1969), Bondar-Clegg carried out a water survey at a spacing of one sample per square mile. This survey included only one sample near the orebody and it ran 19 pCi/L in radon, which they identified as "probably anomalous". This sample was not anomalous in uranium.
  • Later (1972), in a more detailed survey, I collected water samples by canoe from shallow water around the edge and analysed them for radon in a tent. My results are shown in the figure.
  • Several years later the orebody was discovered by the drill (shown in solid black on the figure)
  • All the lakes in the region should be sampled like this, and in favourable areas bottom samples should be tested as well.
INSTRUMENTS
  • 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
1-416-269-9979
morse@finderschoice.com
www.finderschoice.com/radon


Robert H. Morse, Ph.D., P.Eng.
January 23, 2010

If the water in Midwest Lake had been a few feet higher, the radioactive boulder train would have been submerged, but the orebody could have been found with a radon survey.
We have similar results from Kiggavik.

radon anomaly over Midwest Lake uranium deposit

For drill-target location we can run a grid and collect lake bottom waters and sediments, either from a boat, or by drilling through the ice.

Click here for technical details and other applications of our radon instruments.

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