or
F.3
CALCULATION OF MATERIAL BALANCE
The fallout pattern was evaluated out to the 100 r/hr at 1 hr
contour by measuring the areas between contours in sq em and assuming
the arithmotical average of the perinheral contours as the average level
of activity for the area segment batween the contours. There is some
indication that the average value of activity between ccntours is not
arithmetical,
However, existing field data do not indicate any one
continuous function that describes it precisely.
for Shot 1 are given in Table F.1.
Material balance data
TABLE F.1 - Material Balance, Shot 1
Contours considered
in determination of
areas (Fig. 6.6)
(rfnr at 1 hr)
300C to center of
A&verere levels
between contours
at 0+ 9 days
(r/nr)
~
A
( rea )
sq om
Total
rat
(n ot s/s
photons/sec
20
pattern
3.42
5.3 x 1013
1.87 x 10
2000 to 3900
2.85
7.5 x10'3
2,2 x 1020
1000 to 2000
1.71
1.0 x 10/4
1.76 x 10°°
1.56x 104
1,38 x 10°?
3.35 x 104
43.38 x 1020
500 to 1000
100 to 500
0,96
0.342
ee go. 2
)
Therefore, within the 100 r/hr at 1 hr contour 2.39 x 10° photons per
sec are accounted for at 0 + 9 days.
8439 x 1029 . 0.57.
1.47 x 10°
Thus, 57 per cent of the device activity is accounted for.
Fe4
FRACTION OF THE DEVICE COLLECTED IN TOTAL COLLECTOR, STATICN 251,03
A radiochemical analysis+® on the fallout collected at Station
251.03, where the gamma field reading was 1 r/hr at 0+ 9 deys, yielded a
value of the bomb fraction over a 1 sa ft area to be 1.3 x 107 3.
V6
This
VR
‘NO
4
i
1 rfhnr at 0 + 9 days is produced by an infinitely contaminated
plane of uniformly denosited activity of 1.03 x 10° photons per
sec per sq Cm.