Laboratory apparatus for measuring radon emanation from solids

Abstract The rates, J, at which materials emit radon are of interest in studies of the sources of radon in mines, buildings, soils overburden and other places where it may indicate the location of ore or be a health hazard. Here J values were determined by measuring the radon concentrations by means of scintillation counters or alpha-particle track detectors in chambers in which specimens were sealed. Errors in the measurements due to leakage from the chambers, lack of secular equilibrium in the decay series of the radon measured, or the limited rate of diffusion of radon from powders or within the chambers were shown to be insignificant or could be corrected. Scintillation counter measurements are highly reproducible; track detector measurements also appear useable and may be made on many small samples using small, simple chambers. J measurements were made for uranium ores, drill cores, standard CANMET pulps, concrete and gypsum board. Powdering of ores had little effect on their J values.
Keywords: Radon, Emanation rates, Scintillation counters, Track detectors, Uranium, Exploration, Environmental control.
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Summary: A test apparatus has been developed for obtaining the relations among confining stress, porosity and percolation rate for hydraulic sand backfills. The apparatus can also be used to evaluate internal drainage characteristics and the effects of partial saturation on percolation rates. The test apparatus, test procedures and typical test data are presented in this paper.
Publication: CIM Bulletin
Author(s): R.J. MITCHELL, J.D. SMITH
Keywords: Underground mining, Compression, Percolation, Tailings, Backfilling, Hydraulic mining.
Issue: 833
Volume: 74
Year: 1981
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Summary: All ten Canadian provinces have now tabled their 1981/82 budgets. Only the provinces of Ontario, Quebec and British Columbia made more than minor modifications to their tax structures, with both Ontario and Quebec imposing major tax increases. In the past year, the federal budget was also released in the spring. Not so this year: we have that to look forward to in the fall!This month, Tax Notes presents a brief summary of the more significant tax changes introduced at the provincial levels in...
Publication: CIM Bulletin
Author(s): ROBERT D. BROWN
Issue: 833
Volume: 74
Year: 1981
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Summary: A fast, reliable and accurate method for radium-226 determination in environmental water samples has been devised, using an alpha spectroscopic technique. The correlation between barium-133 and radium-226 in the barium-radium sulphate precipitation mechanism was studied and in the limited experimental recovery range, the coefficient of correlation was r = 0.986. A self-absorption study for various barium carrier concentrations was also undertaken to obtain the least broadening of alpha energy...
Publication: CIM Bulletin
Author(s): T.P. LIM, N.K. DAVE
Keywords: Radium, Analysis, Water, Spectroscopy, Environmental control, Barium, Precipitation, Ryan Lake, Nordic Lake.
Issue: 833
Volume: 74
Year: 1981
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Summary: To properly operate a mineral beneficiation plant it is often necessary to have systematic evaluations of the performances of apiece of machinery, of one of the processes or of the plant as a whole. The state of a process can be described from a collection of data: flow-rate values, particle-size distributions and chemical compositions of the various streams of the circuit studied.However, the obtained raw data are generally redundant and inconsistent from a material balance viewpoint, due to...
Publication: CIM Bulletin
Author(s): D. HODOUIN, T. KASONGO, E. KOUAME, M.D. EVERELL
Keywords: BILMAT, Mineral processing, Material balances, Algorithms, Comminution, Desliming, Flotation, Computers, Cyclones, Grinding circuits, Niobec.
Issue: 833
Volume: 74
Year: 1981
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Summary: The behaviour of minerals during flotation of a fine-grained pyrite-rich base metal ore was investigated by studying the feeds, concentrate and tailings from every flotation cell in the mill of Brunswick Mining and Smelting Corp. Ltd., Bathurst, New Brunswick. The samples were analyzed for Zn, Pb, Cu, Fe, Ag, Sb, Sn, Bi, In, Hg, Mo and As. Mass balances were computed and recoveries of all metals from each cell, from each circuit and from the mill were calculated. The percentages of sphalerite...
Publication: CIM Bulletin
Author(s): WILLIAM PETRUK, J.R. SCHNARR
Keywords: Mineral processing, Concentrators, Brunswick Mining and Smelting, Mass balances, Screen analyses, Zinc, Lead, Copper, Sphalerite, Galena, Chalcopyrite, Milling, Flotation.
Issue: 833
Volume: 74
Year: 1981
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Summary: The Cash is one of the largest porphyry copper-molybdenum deposits found in Yukon to date. It is 80 km northwest of Car-macks, within the unglaciated portion of the Dawson Range, and is associated with the Big Creek fault, an important tectonic feature. Part of the mineralized zone is blanketed by up to 70 m of alluvial drift. The remainder is covered by a relatively thin residual soil layer. The mineralized zone, however, was not detected by conventional stream-sediment sampling because...
Publication: CIM Bulletin
Author(s): W.D. SINCLAIR, R.J. CATHRO
Keywords: Cash deposit, Copper, Molybdenum, Dawson Range, Yukon, Porphyry deposits, Geochemical exploration, Soil analysis, Alteration.
Issue: 833
Volume: 74
Year: 1981
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Summary: Noranda's Lyon Lake property in the Sturgeon Lake area of Northwestern Ontario was staked by Mattagami Lake Mines Limited in May 1969 to cover airborne Input anomalies. Subsequent ground geophysical and diamond drilling programs resulted in the discovery of the Boundary Extension, Lake and Creek ore zones. As of December 31, 1978, ore reserves were estimated at 3,945,000 tons assaying 6.53 per cent Zn, 1.24 per cent Cu, 0.63 per cent Pb, 3.42 oz/ton Ag and 0.010 oz/ton Au. These deposits are...
Publication: CIM Bulletin
Author(s): J.D. HARVEY, J.B. HINZER
Keywords: Lyon Lake deposits, Sturgeon Lake area, Zinc, Copper, Exploration, Geophysical exploration, Alteration, Ore deposits.
Issue: 833
Volume: 74
Year: 1981
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