![]() The time to load vehicles and move out of the contaminated area must be estimated. A unit moving on foot will be fully exposed and will have a transmission factor of 1.0. The transmission factor of a vehicle may be calculated. Since all shelters are not the same, an average value should be used. The average transmission factor of the fallout shelters and the vehicles used to leave the contaminated area must be computed. This will necessitate waiting until fallout is complete at present positions. When moving from an area contaminated by fallout, the unit moves into an uncontaminated location. If the nuclear burst was not sighted by the unit, the nearest NBCC will provide the H-hour. To compute the optimum exit time for a fallout area, you must know the time of detonation, location of uncontaminated area and the average transmission factor of the vehicles used and the shelters involved, plus the time required to evacuate the position. By evacuating at the optimum exit time, the radiation dose to personnel is kept to a minimum. If the situation permits, and higher headquarters approves, the commander may decide to move out of the contaminated area. If the shelter provides any appreciable amount of protection, it will be advantageous to remain and improve the shelter rather than to evacuate to an uncontaminated area. Shelters, such as field emplacements, are the best protective measures against nuclear radiation for troops. Radiological fallout may present a serious hazard to units that remain in a contaminated area. ![]() This chapter details the mathematical procedures required to provide this essential information.
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