728
PELLETIER, WHIPPLE, AND WEDLICK
survey around the Fermi Reactor, except that the collection time was
only one week.
RESULTS
Table 2 shows the results of the measurements for both the Fermi
Reactor survey and the Tecumseh farm. For the purposes of analysis
of the data from the Fermi Reactor environmental survey, all nine air
concentrations, all ten deposition measurements, and all ten rainfall
measurements were averaged for each four-week collection period.
Each value in Table 1 therefore represents a four-week average over
an area of about 500 square miles.
When the ratios of deposition to air concentration were plotted
against rainfall, the points were scattered, but they showed an upward
trend with increasing rainfall. However, when the data were divided
into groups according to date, the scattering was almost eliminated,
and the data were found to follow three distinct curves as shown in
Table 2— RESULTS OF GROSS BETA MEASUREMENTSOF PRECIPITATION
AND AIRBORNE DUST COLLECTED IN THE NETWORK OF STATIONS FOR
THE ENVIRONMENTAL SURVEY OF THE ENRICO FERMI ATOMIC
POWER PLANT AND AT THE TECUMSEH STUDY FARM
Fermi environmental survey
End of
Depo-
Rain-
Air
sampling
interval
sition,:
pe/m*
fall,
concentration,
1963
Jan. 24
Feb, 21
Mar. 21
7.05104
4.61 x 104
15.5104
0,216
0.226
2.08
May 16
June 13
33.010!
31.0 x 104
3.53
3.96
3.1x104
0.03
5.76104
1.39
Oct. 31
Nov. 27
1.37% 104
3.04 x 104
1964
Jan. 23.
Feb, 20
Mar. 19
Apr. 16
June 11
Apr. 18
July11
Depo-
Rain-
Air
sition,
fall,
concentration,
7.57
5.57
5.67
8.5x 104
7.9x 104
17.8 x 104
0.316
0.498
1,54
6.28
7.70
6.83
9.10
7.30
30.2 x 104
16.5 x 104
2.84
1.64
9,38
8.48
10.9x 104
1.10
4.0
5.05 x 104
1.16
4.78
0.57
1.85
1.68
1.09
2.37 x 104
2.20104
1,07
1.43
2.00
1.07
1.55 x 104
1.69104
2.73 x 104
8.55 x 104
1.08
1.01
1.42
3.94
7.60104
2.28
17.1104
in.
1.52
Aug. 8
10.2104 1.81
Oct. 3
3.50 x 104
Sept.5
Dec, 26
May 14
Tecumseh study farm
1.27
1.18104 0.61
9.30104 4.50
pe/m?
7.29
8.85
6.10
2,20
0.81
'
pe/m?
20.6 x 104
in,
1.30
10.7x 104 2.59
2.96 x 104
1.06
pe/m?
8.38
9.48
9.88
3.25
1.09 x 104
0.511
0.94
1.12
1.22
1.45
1.68 x 104
1.12 x 104
3.40 x 104
7.16104
0.925
0.555
1.550
3,140
0.83
1.15
1.24
1.65
1.78
5.95 x 104
2,89
1.98
1.50
6.20 x 104
3.120
0.92
1.81