@article{
 title = {Regional survey for He anomalies in Canadian shield lakes: sources of variation and implications for nuclear fuel waste management},
 type = {article},
 year = {1993},
 identifiers = {[object Object]},
 pages = {373-382},
 volume = {8},
 id = {77306fff-0208-3dc7-8f2b-c375b76a3e3b},
 created = {2019-07-12T15:07:46.365Z},
 file_attached = {true},
 profile_id = {3c181434-ae75-3e95-a723-2bfcc2f14c0b},
 group_id = {db3318bf-b2fb-3b86-9f1d-17188c0ddfa3},
 last_modified = {2019-07-23T20:09:08.628Z},
 read = {false},
 starred = {false},
 authored = {false},
 confirmed = {true},
 hidden = {false},
 citation_key = {Stephenson1993},
 private_publication = {false},
 abstract = {Bottom-water He concentration (=[He]) was measured in the late summers of 1989, 1990 and 1991 in the waters of lake basins at the Experimental Lakes Area in northwestern Ontario, Canada. A total of 32 basins were sampled every year. Helium concentrations were relatively stable from year to year, exhibiting a mean coefficient of variation of 34%. Total [He] ranged from values below the atmospheric equilibrium concentration of 47 nl He/l H2O to a maximum of 5364 nl/l measured in Lake 625 in 1991. Total [He] exhibited a two-phase distribution, with a large subpopulation of basins having only modest He enrichment (geometric mean G.M. = 77 nl/l, geometric standard deviation G.S.D. = 1.65, n = 39), and a small subpopulation of basins, including Lakes 625, 634 and 615, with large He anomalies (G.M. = 692 nl/l, G.S.D. = 3.08, n = 6). Using hydrological, morphometric and physical data for each lake, bottom-water [He] was predicted. A model including lake order and lake width accounted for 22% of the total variance in [He]. These results support the hypothesis that excess He in lake-bottom-water originates with deep groundwater discharge via fractures in the underlying granite. © 1993.},
 bibtype = {article},
 author = {Stephenson, M. and Schwartz, W. J. and Motycka, M. F.},
 journal = {Applied Geochemistry},
 number = {4}
}

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A total of 32 basins were sampled every year. Helium concentrations were relatively stable from year to year, exhibiting a mean coefficient of variation of 34%. Total [He] ranged from values below the atmospheric equilibrium concentration of 47 nl He/l H2O to a maximum of 5364 nl/l measured in Lake 625 in 1991. Total [He] exhibited a two-phase distribution, with a large subpopulation of basins having only modest He enrichment (geometric mean G.M. = 77 nl/l, geometric standard deviation G.S.D. = 1.65, n = 39), and a small subpopulation of basins, including Lakes 625, 634 and 615, with large He anomalies (G.M. = 692 nl/l, G.S.D. = 3.08, n = 6). Using hydrological, morphometric and physical data for each lake, bottom-water [He] was predicted. A model including lake order and lake width accounted for 22% of the total variance in [He]. These results support the hypothesis that excess He in lake-bottom-water originates with deep groundwater discharge via fractures in the underlying granite. © 1993.","bibtype":"article","author":"Stephenson, M. and Schwartz, W. J. and Motycka, M. F.","journal":"Applied Geochemistry","number":"4","bibtex":"@article{\n title = {Regional survey for He anomalies in Canadian shield lakes: sources of variation and implications for nuclear fuel waste management},\n type = {article},\n year = {1993},\n identifiers = {[object Object]},\n pages = {373-382},\n volume = {8},\n id = {77306fff-0208-3dc7-8f2b-c375b76a3e3b},\n created = {2019-07-12T15:07:46.365Z},\n file_attached = {true},\n profile_id = {3c181434-ae75-3e95-a723-2bfcc2f14c0b},\n group_id = {db3318bf-b2fb-3b86-9f1d-17188c0ddfa3},\n last_modified = {2019-07-23T20:09:08.628Z},\n read = {false},\n starred = {false},\n authored = {false},\n confirmed = {true},\n hidden = {false},\n citation_key = {Stephenson1993},\n private_publication = {false},\n abstract = {Bottom-water He concentration (=[He]) was measured in the late summers of 1989, 1990 and 1991 in the waters of lake basins at the Experimental Lakes Area in northwestern Ontario, Canada. A total of 32 basins were sampled every year. Helium concentrations were relatively stable from year to year, exhibiting a mean coefficient of variation of 34%. Total [He] ranged from values below the atmospheric equilibrium concentration of 47 nl He/l H2O to a maximum of 5364 nl/l measured in Lake 625 in 1991. Total [He] exhibited a two-phase distribution, with a large subpopulation of basins having only modest He enrichment (geometric mean G.M. = 77 nl/l, geometric standard deviation G.S.D. = 1.65, n = 39), and a small subpopulation of basins, including Lakes 625, 634 and 615, with large He anomalies (G.M. = 692 nl/l, G.S.D. = 3.08, n = 6). Using hydrological, morphometric and physical data for each lake, bottom-water [He] was predicted. A model including lake order and lake width accounted for 22% of the total variance in [He]. 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