Table 1.
Radioactivity of Marsh Samples
Plankton values in disintegrations per minute per gram of wet sample
Water
_
Filter paper "
"
Surface
Stn.
W.
fp.
Ww.
1
14356
2859
6
8064
8
fp.
w.
fp.
150m
fp.
w.
fp.
v.
fp.
35
21
9
370
166
58
-1228
29
4
-#306
35
692
27
453
3738
281
4346
261
472
48
178
96
11683
5460
1343
3020
218
5172
276
552
128
308
30
12604
10
3072
1323
664
36
284
18
186
10
2122
18
713
11
12
13
14
15
1834
2926
3286
1650
1886
548
8329
779
2353
256
16
17
18
19
20
1824
1450
1606
1354
1378
502
214
380
108
5428
9
1786
2096
* Sample from 500m
1112
88
666
140
27
41
93
388
188
648
670
214
434
10
22
46
=22
37
106
106
104
100
234
248
200
1690
2ejk
302
15
#418
18
18
©8662
1
194
1124
14
56
6
68
=i
82
158
1252
164
598
672
468
528
27
42
AT
8947
38-459
250
190
250
238
222
«24
116
3922
=—1T
8638
1184
46
20
31
34
16
15
#4156
#174
40
50
4s
:
483
796
1065
1448
14788
3426
3692
10
18
20
22
27
8348
3313
2065
886
596
3
122
36—COT
8
16
2
-8
4
66
4S0
459
382
466
612
88
72
90
#110
84
}
Plankton
226
168
126
5310
136~=6#(1
12 74%
=56 -6
298 46
252*
400m
8059
54
12
124
1582
1306
100m
}
:
.
277
634
98
w.
E
“ liter
for the residue from 1 liter of water
4O4
2860
294
2080
10838
5140
6706
6552
302
50m
"
"
1766
7
\ \.\
25m
"
"
8022
3117
1510
588
2
3
i
5
Ge~
"
"
ie