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150-1450
100-1050
1.€
& 110-1050]2.4
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considered to be uncertain, or where the gap between points was so
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90-1050] 2.5 1050-2300
100-1050 2.5
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great as to cause difficulty in perceiving the continuity of the curve.
§
*
a
;
From the original graphs the curves were copied over
onto tracing paper.
A somewhat natural sequence of subject matter
was arranged, progressing from soil
kingdoms.
a light-table
through the plant and animal
Each graph was oriented by means of the 1000-day verti-
cal line.
Thus, the position of the curve in the series is no index of the
amount of radioactivity involved.
Absolute levels may be computed
960-2300
-97§-1050/2.2
1050-1450]
|
by referring to the column of Table 1 headed "Plate count, 1000 days."
For example, if for curve 25, the value of the plate count at 2300 days
were required, then reference to Table 1 would show a plate count at
1000 days of 700, while the ordinates as scaled from Figure 1 on days
1000 and 2300 were 18 and 2.4 respectively.
The ratio, 2.4/18, is
multiplied by 700 to give a result of about 93 c/m, which is reasonably
close to the actual value, 90 c/m (original data, not shown here).
Slopes of curves were scaled from the finished drawings of Figures
1-6, using a transparent slope-scaler calibrated in tenths from slope
1050-2300
1050-2300
-O.1 to -2.0 and by greater increments from -2.0 to -5.
For each
100-1050) 1.0
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1050-2300
280-2300
200-2300"
176-1050] 2.3
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7O-1050' 2.2
100-1050! 2.5
1050-2300
1050-2300
thus necessitating subjective interpretations as to what constituted a change
70-1L000i~2
100-1050/ 2.2
1000-2 300
1050-2300
of slope.
100-1050]
180-1050;
.@ 1050-2300
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2.1
100-1100) 2.2
130-10£0/ 2.5
200-1000] 1.3
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200-1160/ 2.7
7O1050/ 2.5
100-_960/2.2
2.3
2.3
100-1050: 2.2
100-1050, 1,0
1050-2300
1100-2300
1050-2300
1000-2300
1160-2300
1160-2300
1050-2300
960-2300
1050-2300
1050-2300
1050-2300
1050-2300
ae wwe me get
.
curve, the portions of markedly different slope were measured separately,