Radium Geochemistry in Sediments Responds to Uranium Mineralization at Bancroft
- 95 sediment samples from streams and lakes.
- Clastic and organic sediment. 38 locations have both types, clearly separate and distinct.
- When both types present radium is higher in organic type.
- Radium values in the two types rationalized on a curve and plotted and contoured on the same map (shown).
- Uranium mineralization is concentrated along the belt of syenitic rocks and nepheline gneiss which occupies the contact between plutonic rocks to the northwest and metasedimentary to the southeast.
- Note the high values associated with the mineralization and contact
- Samples downstream from Faraday Mine also high but left off the map because possibly contaminated.
- Published in Canadian Mining Journal, May 1969, p. 75-76
- 258 sediment samples.
- See notes above.
- From Ph.D. thesis, Queen's University, 1970
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- Ideally use 20 grams of sample but we have worked with less than a gram of fines.
- Cover the sample with water, let the radon grow it to equilibrium, and measure radon in the water in the normal way.
- Half-life to reach equilibrium is 3.8 days.
- Fine sediments collected wet and kept under water remain pretty well in equilibrium.
- In the same way you can also measure radium in plant parts, soil, crushed rock etc.
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- We measure: radon - radium - thoron - radon daughters - alpha radiation.
- The Lucas cell is recognized as the most sensitive and reliable method for these elements.
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Robert H. Morse, Ph.D., P.Eng. June 29, 2007