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

*****t**** LAKE MICHIGAN RADIOLOGICAL, SURVEY ** **.........
Table A-20 (Cont'd.)
RADIOACTIVITY IN SEDIMENT
Arranged by Increasing Depth of Sampling

SAMSAMPLESAMPLE
STATION DEPTH
NUMBER (FEET)

TYPE SAMPLE ACTIVITY IN 1,2
OF PICOCURIES PER GRAM (PERCENT ERROR)
SAMPLE CESIUM-137 POTASSIUM-40 RADIUM-2263

208 CD-3** 390 CLAY 2.75 (12%)
180 CD-3** 390 CLAY 5.41 ( 8%)
177 CD-3** 390 CLAY 1.23 (18%)
251 CD-3.** 390 _.,.CLAY...98 (26%).....
193 D-5*** 400 CLAY 2.44 (10%)
238 D-5*,:'* 400 CLAY 2.12 (16%)
157 D-5*-* 400 CLAY 0.44 (30%)
269 B-4*** 425 CLAY 2.59 (20%)
259 B —4*** 425 CLAY 2.87 (14%)
195 C —5'** 500 CLAY 1.31 (18%)
246 C-5,*'* 500 CLAY 1.09 (20%)
274 C —5`** 500 CLAY 1.73 (32%)
223 D —4':* 540 CLAY 0.61 (38%)
178 D —4*** 540 CLAY 0.87 (24%)
273 D-4*** 540 CLAY 1.40 (34%)
217 E —2*.** 550 SILT, 0.50 (20%)
228 D —3** 550 CLAY 3.91 (10%)
198 E-5*** 550 CLAY 0.0 0%)
161 E —5** 550 CLAY 0.0 0%)
175 D —3*** 550 CLAY 5.44 (12%)
252 D —3** 550 CLAY 3.10 (12%)
264 E —2*,* 550 SILT 0.77 (16%)
150 E —2'** 550 CLAY 0.60 (32%)
237 E —5*** 550 CLAY 0.57 (56%)
225 EF-3** 600 CLAY 0.0 ( 0%)
250 EF-3** 600 CLAY 0.0 0%)
179 EF-3** 600 CLAY 0.0 0%)
176 E-4-** 650 CLAY 0.22 (94%)
163 E —4** 650 SILT 0.25 (56%)
236 E-64** o50 CLAY 1.57 (18%)
222 E-3 ** 800 CLAY 1.02 (24%)
162 E —3** 300 CLAY 0.49 (52%)
266 E —3*:* 800 CLAY 0.0 0%)

24.57 (14%) 2.33 (20%)
16.43 (14%) 1.39 (22%)
23.17 (16%) 2.68 (18%)
28.07 (16%) __ 3.36 (18%).
17.32 (14%) 1.12 (24%)
17.93 (20%) 1.46 (30%)
15.75 (16%) 1.32 (20%)
29.88 (20%) 2.76 (28%)
22.64 (18%) 2.53 (22%)
24.51 (14%) 2.*40 (18%)
23.06 16%) 2.69 (18%)
24.88 (26%) 3.11 (28%)
30.20 (14%) 3.11 (18%)
25.58 (14%) 2.77 (18%)
26.20 (22%) 3.05 (26%)
14.22 (14%) _ 1.29 (18%)
28.58 (14%) 2.92 (20%)
28.68 (16%) 2.59 (22%)
24.06 (16%) 2.95 (18%)
44.57 (16%) 4.61 (20%)
26.06 (16%) 2.84 (20%)
11.57 (16%) 0.93 (22%)
14.12 (18%) 2.56 (18%)
29.00 (18%) 3.24 (22%)
33.89 (14%) 3.25 (18%)
28.86 (14%) 3.30 (18%)
28.77 (14%) 3.22 (18%)
30.46 (14%) _ 3.11 (18%)
15.38 (16%) 1.71 (20%)
24.17 (16%) 2.12 (22%)
31.57 (14%) 2.82 (20%)
28.99 (16%) 3.47 (18%)
32.55 (16%) 2.86 (22%)

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 —50