5.
Crossing an Induced Radiation Area.
If an area must be crossed, select the
lowest dose rate area, consistent
with the mission.
Route selection may
be influenced by several factors.
Induced radiation areas often may be
avoided.
However, the tactical
situation may require that units cross
an area in which there is induced
radiation.
In calculating total dose, it is necessary to determine an average dose
rate. Dose rates increase as the center of the area is approached and then
decrease beyond the center of the area.
a. Average Dose Rate.
The average dose rate represents a mean value to which the individual is
exposed during the time of stay. A reasonable approximation of the average
dose rate can be obtained by dividing by two the maximum dose rate predicted
to be encountered.
b. Time of Stay.
Stay time must be calculated for crossing problems.
An example problem is given below for calculating dose when crossing an
induced radiation area (Figure 5-11).
GIVEN:
A crossing will take place at H + 20 hours, as shown in
Figure 5-11.
Distance of the route across the area is 1
kilometer; the rate of speed during the crossing, on foot,
will be 5 kilometers per hour.
FIND:
D.
CM5206
5-36
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