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

*t-******* LAKE MICHIGAN RADIOLOGICAL SURVEY ****-*****
Table-A-21 (Cont'd.)
RADIOACTIVITY IN BENTHOS

1
SAMPLE SAMi'PLE VWEIGiHT COLLECTION
STATION NU'-H EP (I R A VS) DATE

ACTIVITY IN PCI/GRAM
CESIUM-137 ZINC-65

2
(% ERROR)
GROSS BETA'4

E-2***
E - 24;:
E F-2**
E F -4 44:
F- 5***
F-5*
K E '::4 -PAL* 4*
P T,,
Z I ON 4*
7 ION'*
Z I ON -'

41
58
2 7
304
43
48
297
39
42
61
301
34
55
289
46
52
37
47
292
308

0.0 349
3." 373
1 9i 37
2.68 18
0.3063
0.6229
0.7049
0.25B1
0.0264
3.8336
2.1045
0.2970
1.2250
1.9398
0.0396
1.4 152
0. 8 6 3
4. 3584
1. 6252
4.2351

08-25-69
10-30-69
05-15-70
05-16-70
08-26-69
10-31-69
05-16-70
09-02-69
09-01-69
11-02-69
05-19-70
09-06-69
11-04-69
05 -22-70
10-04-69
11-10-69
09 -07-69
10-14 -69
05-03-70
06-09-70

0.0 0%)
5.0 (34 )
4.0 (62%)
8.9 (30%)
0.0 ( 0%)
0.0 0%
0.0( T0%
0.0( 0%)
0.0 ( 0
6.3 (22%)
5.2 (68'
0.0( 0%)
0.0 0%)
6.7 (44i'')
0.0 ( 0%)
0.0 ( 0%)
0.0 ( 0 )
0.0( 0%)
4.9 (74%)
5.9 (28%)

0.0
0.0
0.0
11.9
58.8
0.0
0.0
0.0
0.0
0.0
0.0
0.0
0.0
10.3
429.3
0.0
0.0
0.0
9.8
8.7

t0O) 55.5 (30%)
0%) 182.0 2%)
0%) 123.2 3% )
(50%) 220.0 2%)
(68%) 39.7 (11%)
0t b) 81.9 5%)
0%) 125.8 4'')
0%) 50.3 (10%)
( %) 258.5 (12%)
0%) 214.0 ( 1%)
0%) 188. 4 2%)
0%) 48.3 (10%)
0( ) 67.7 5%)
(64%) 156.9 ( 2g )
(74%) 43.6 (33' )
0%) 36.1 6%)
( 0) 51.3 6%)
I 0 ) 24.4 ( 5%)
(84%) 177.8 ( 2%)
(44o) 172.7 ( 2%)

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
(July-August 1970).
4. 0.0 (0%) signifies that the activity in the sample was less than the minimum
detectable limit.

A-52