5.
Example Problems.
The following problems are concerned with techniques only and do not
consider the impact that these doses or dose rates might have on operations
in a contaminated area.
Example Problem 1.
GIVEN:
Troops must cross the fallout area, shown in Figure. 5-4, at
H + 3 in M113 Armored Personnel Carriers at a rate of speed of
10 kilometers per hour (kmph).
The route from A to B, a
distance of 5 kilometers (km), will be used.
FIND:
Total dose that will be received by troops.
SOLUTION:
1. Calculate the average dose rate. Ravg = 1/2
Rmax = 1/2 (300 cGyph) = 150 cGyph (at H + 1).
2.
Normalize Ravg to H + 1.
Ravg is already at H + 1.
3.
Calculate the time of stay.
4.
Find the outside dose, using Figure 5-2 on page 5-12.
Ravg = 150 cGyph
Te = H + 3 hours.
Ts
= 0.5 hour
D = 18 cGy.
5.
Calculate the inside dose.
TF = 0.3 (Figure 5-3 on page 5-16).
ID = OD x TF = 18 x 0.3 = 5.4 cGy.
ANSWER:
5.4 cGy.
5-19
CM5206
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