TABLE 29

CESIUM ACCUMULATION IN GREAT LAKES BIOTA -- PART II 137 Cs IN GREAT LAKES FISHES;
STUDIES AT HWR NUCLEAR GENERATING STATIONS
(adapted from operating reports of Ontario Hydro)

Year

Lake and
Station

Sample or
Substrate

Activity (Bq/L or Bq/kg)

137 Cs/ 40 K

Sample or
Substrate

Bioaccumulation
Factors

137 Cs     40 K 137 Cs 40 K
1992 Ontario
Darlington
(Provincial Park)
Trout
Whitefish
Sucker
Water
Sediments
1.07 0.15
0.56 0.15
0.18 0.15
<0.003
2.5 1.3
120 4
119 4
105 6
0.14 0.03
360 30
0.0089
0.0047
0.0017

0.0069
Trout/water
Whitefish/water
Sucker/water
Water/sediments
*
*
*
857
850
750
0.000389
1992 Ontario
Darlington
Trout
Whitefish
Sucker
Water
Sediments
0.96 0.18
0.48 0.18
0.23 0.11
<0.003
<1.2
124 6
126 6
109 4
0.14 0.04
410 30
0.0077
0.0038
0.0021
Trout/water
Whitefish/water
Sucker/water
Water/sediments
*
*
*
886
900
779
0.000342
1992 Ontario
Pickering
("A" Discharge)
Trout
Whitefish
Sucker
Water
Sediments
1.04 0.22
0.63 0.15
1.15 0.22
0.015 0.004
16.5 1.5
137 7
120 4
121 7
0.14 0.04
410 30
0.0076
0.0053
0.0095
0.107
0.0402
Trout/water
Whitefish/water
Sucker/water
Water/sediment
69.3
42.0
76.7
0.00091
979
857
864
0.000342
1992 Ontario
Pickering
("B" Discharge)
Trout
Whitefish
Sucker
Water
Sediments
0.92 0.18
0.85 0.22
1.00 0.22
<0.003
7.0 1.3
132 4
136 6
131 6
0.17 0.05
430 30
0.0069
0.0063
0.0076

0.0162
Trout/water
Whitefish/water
Sucker/water
Water/sediment
*
*
*
776
800
771
0.000395
1992




1992
Ontario
Pickering
(Duffins Creek)


Ontario
Pickering
(Coolwater Farms)
Trout
Whitefish
Sucker
Water
Sediments

Rainbow trout
Rainbow trout
1.00 0.15
0.74 0.22
0.96 0.18
<0.003
8.5 1.4

<0.15
0.2 0.1
104 3
133 6
153 4
0.17 0.04
390 20

128 4 (w)
117 4 (s)
0.0096
0.0056
0.0063

0.022


0.0017
Trout/water
Whitefish/water
Sucker/water

Water/sediment
0
*
0
612
783
900

0.00044
Limiting Values of Bioaccumulation Factors for 137 Cs in fishes
relative to water based on LLD of the radionuclide of 0.003 Bq/L
for Lake Ontario Nuclear Generating Stations
Trout/water
Trout/water
Trout/water
Trout/water
357 (Darlington: Prov. Park)
320 (Darlington: NGS)
307 (Pickering: B)
333 (Pickering: Duffins Creek)

Average geochemical ratios 137 Cs/ 40 K factors for species monitored at HWR facilities

Lake and Station Species 137 Cs/ 40 K Species 137 Cs/ 40 K Species 137 Cs/ 40 K Species 137 Cs/ 40 K
Lake Ontario:
    Darlington
    Pickering

Trout
Trout

0.0083
0.0083

Whitefish
Whitefish

0.0043
0.0053

Sucker
Sucker

0.0019
0.0078
Average for Lake Ontario fish:
sp;  Sucker    0.0048    All fishes    0.0060

Average Bioaccumulation factors for species monitored at HWR facilities on Lake Ontario

137 Cs 40 K 137 Cs 40 K
Darlington
Trout/water
Whitefish/water
Sucker/water
Average all fish/water

*
*
*
*

872
875
765
837
Pickering
Trout/water
Whitefish/water
Sucker/water
Average all fish/water

69
42
77
63

789
813
845
816

Average geochemical ratios for 137 Cs/ 40 K for species monitored at HWR facilities on Lake Huron

Station Species 137 Cs/ 40 K Species 137 Cs/ 40 K Species 137 Cs/ 40 K Species 137 Cs/ 40 K
Bruce Trout 0.0185 Walleye 0.0238 Bass 0.021 All fish 0.0194

Average Bioaccumulation factors for species monitored at HWR facilities on Lake Huron

Station Species 137 Cs 40 K
Bruce Walleye/water
Bass/water    
Trout/water
Average all fish/water
*
*
*
*
1063
1123
1318
1168

Comparisons of Lakes Ontario and Huron

Average geochemical ratios for 137 Cs/ 40 K     
Lake Ontario/Lake Huron
Average bioaccumulation factors 137 Cs and 40 K
Lake Ontario/Lake Huron
Trout 0.45 All fish 0.31 All fish/water * 1.41
Notes :    (1) Sediment data are dry weight; fish data are wet weight
    (2) Symbols: (w) samples taken in winter-spring period (January to June); (s) samples taken in summer-autumn period (July to December); (*) cannot calculate the number from information given.
    (3) Averages of bioaccumulation factors are calculated when there are two or more results for a given species of fish. The overall average bioaccumulation factor for fishes in a lake averages all data from that lake without regard to the number of entries per species.
    (4) Bioaccumulation factors reported for 137 Cs based on one data set only.
    (5) Ratio of bioaccumulation factors for 40 K for Lake Ontario and Lake Huron comparison obtained by taking the ratio of the averages of all of the bioaccumulation factors for the fishes of each lake.

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