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

**-**** ** ' LAKE MICHIGAN RADIOLOGICAL SURVEY **_*******
Table A-18 (Cont'd.)
RADIOACTIVITY IN SEDIMENT - 1969

SAMPLE SAMPLE 'EIGHT
STATI N NUiMBER (GRAMS)

COLLECTION
DATE

ACTIVITY
CESIUM-137

IN PCI/GRAM
RADIUM-226

(% ERROR)2
POTASSIUM-403

F-5 * '**
F - 6 * i:'4
iK E W 4'::-'
K EW4 " '
P A L;:' ',: "',
I A L;','ZI ON'

268
154
159
235
282
241
242
158
280

366-.0
740. 0
575.0
609. 0
4 75.0
544.0
576,0
631.0
553.0

1 1-02-69
09-01-69
09-06-69
11-04-69
11-04-69
10-04-69
11-10-69
09-07-69
10-14-69

0. 2 (90% )
0.1 (58%)
0.7 (14 )
0.2 (38%)
0. 9 ( 12" )
0.2 (58%)
0.1 (56%)
0.2 (30%)
0.2 (58%)

1.7
0.4
0.7
0.6
0.8
1.4
0.5
0.5
1. 7

(22%)
(24 %)
(22%)
(22%)
(2 Q%)
(20%)
(22 % )
(22 )
(20%)

28.3
4.5
8.2
6.2
14.0
7. 1
5.4
9.6

( 16%)
(1 8% )
( 16%)
(16%)
( 1 6 )
( 1620)
(20?).'.

1. Dried weight.
2. Number'in parentheses is percent error (two standard deviations) of total
radioactivity content in sample.
3. Radioactivity levels were corrected for_ decay back to the date of collection.

A-44