Lake Michigan environmental survey : final report / [edited] by John C. Ayers.

** *'* *-* LA KE MICHIGAN RADIOLOGICAL_ S URVEY ***_*****_
Table A-23 (Cont'd.)
RADIOACTIVITY IN PHYTOPLANCTON

SAtPLE SAMPLE WEIGHT COLLECTION
STATION NUMBER (GRAMS) DATE

ACTIVITY IN PCI/GRAM
CESIUM-137 ZINC-65

(% ERROR)2
GROSS BETA3'4

E-2*6*
E -2*
E - 2 '*' -I*
E F - 2 *4
EF-2 4*
EF —244
EF-44*
F -54* '
F - 5 * ' *
KF-5**
K EW.....
P 1? * A -
Z I CN
Z I ON*4

100
315
326
108
127
330
103
318
101
126
321
104
111
325
121
125
324
107
112
313
322

0. 5503
0.7258
2.7979
0.2474
0.5287
2.2995
0. 12 48
1.5120
0.1254
0. 4548
2 6969
0.3544
2. 9450
2. 3047
0.7490
1.6633
2.6407
0.2923
2 3437
2.1188
1.6820

08-25-69
05-15-70
05-15-70
08-26-69
10-31-69
05-16-70
08-02-69
05-20-70
09-01-69
11-02-69
05-19-70
09-06-69
11-04-69
05-22-70
10-04-69
11-10-69
06-02-70
09-07-69
10-14-69
05-03-70
06-09-70

0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
3.0
0.0
4.1
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0

0( O%
0%)
0%)
0%)
0%)
0)
0%)
( O%)
0%
( 0 )
( 0 )
40%)
0%)
( 0%
0%)
( 0%)
0%)
0%)
( 0%)

45 4
0.0
0.0
165.7
68.1
0.0
0.0
0.0
0.0
59.4
0.0
81.8
6.5
0.0
0.0
21.0
0.0
0.0
0.0
15.1
0.0

(66%) 34.2 ( 9%)
( 0 ) 32.0 ( 9 %)
0%) 30.1 ( 5%)
(42%) 28.6 (14%)
(48%) 27.6 (10%)
0%) 31.8 ( 5%)
(0%) 81.8 (10%)
0%) 36.3 (6%)
0%) 29.1 (20%)
(66%) 16.5 (15%)
0%) 32.5 5%)
(62") 41.2 ( 9%)
(60%) 16.7 ( 4%)
( 0 ) 53.2 ( 4%)
0% ) 24.2 (10%)
(52%) 17.3 ( 9%)
( 0%) 42.2 5'Y)
( 0 ) 44.1 (10%)
( 0%) 18.1 ( 8%)
(44%) 30.9 ( 6%
0%) 29.0 ( 7%)

1. Ash weight.
2. Number in parentheses is percent error (two standard deviations) of total radioactivity
content in ash.
3. Cesium-137 and Zinc-65 radioactivity were corrected for decay back to the date of
collection. Gross beta radioactivity is given for the date of counting (JulyAugust 1970).
4. 0.0 (0%) signifies that the activity in the sample was less than the minimum
detectable limit.

A-56