Example Problem 2.
GIVEN:
Troops must cross the fallout area shown in Figure 5-5 at H +
3 in 2 1/2-ton trucks moving at 15 kmph, using the route A-B-
C-D-E. Total distance = 7.5 km.
FIND:
Total dose that will be received by troops.
SOLUTION:
1.
Calculate the average dose rate.
R1avg = 1/2 R1max = 1/2 200 cGyph,
estimated
between
the
100
and
300
cGyph
line
= 100 cGyph (at H + 1).
2.
Normalize R1avg to H + 1.
Ravg is already at H + 1.
3.
Calculate the time of stay.
4.
Find the outside dose, using Figure 5-2.
Ravg = 100 cGyph
Te = H + 3 hours.
Ts
= 0.5 hour
D
= 12 cGy.
5.
Calculate the inside dose.
TF = 0.6 (Figure 5-3).
ID = OD x TF = 12 x 0.6 = 7.2 cGy.
ANSWER :
7.2 cGy.
CM5206
5-20
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