SOLUTION:
Align the hairline with the 7-hour tick mark on the Soil
Type III scale (Figure 5-8) and equal values of the left
and right reference lines.
Pivot the hairline about its
point of intersection with the index scale to the 300 cGyph
point on the R1 scale. Read the dose rate as 50 cGyph at
the point of intersection with the Rt scale.
ANSWER:
50 cGyph.
Problem 3.
GIVEN:
R1 = 280 cGyph.
FIND :
Time when Rt = 90 cGyph.
SOLUTION:
Since the soil type is not indicated, Soil Type II (Figure
5-7) must be used for this calculation. Connect 280 cGyph
on the R1 scale and 90 cGyph on the Rt scale. Read time as
H + 15 hours on the Soil Type II (index) scale.
ANSWER:
H + 15 hours.
Problem 4.
GIVEN:
R1 = 200 cGyph.
FIND:
Time when Rt = 70 cGyph in Soil Type IV.
SOLUTION:
Connect 200 cGyph on the R1 scale and 70 cGyph on the
Rt
scale.
Holding the hairline firmly at its point
of
intersection with the index scale, align equal values
on
the left and right reference lines.
Read time as H +
10
hours at the point of intersection with the Soil Type
IV
scale (Figure 5-9).
ANSWER:
H + 10 hours.
5-27
CM5206
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