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.

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