COMPUTE THE TIME OF STAY IN A FALLOUT AREA
Critical Task: 031-506-2010
In this lesson you will learn how to compute the time of stay in a fallout area.
TERMINAL LEARNING OBJECTIVE:
Compute the time of stay in a fallout area.
Given information about and illustrations of the procedures for using the total dose
nomogram or the M28A1 Nuclear Calculator Set to compute the time personnel stay
in a fallout area when the time of entry, dose rate, and transmission factor are known.
Demonstrate competency of the task skills and knowledge by responding to the
multiple-choice test covering the procedures for computing the time of stay in a
REFERENCES: FM 3-3, FM 3-3-1 and STP 3-54B2-SM.
The amount of radiation absorbed by personnel in a fallout area is directly associated to the amount of
time spent in the fallout area. Regardless of whether the personnel are in the open or are shielded from
the radiation, the longer they remain in the area, the larger the dose of radiation they will receive. A
commander can control the amount of radiation received by the personnel in several ways. When
crossing a fallout area, the time of stay can be reduced by selecting a shorter route or by increasing the
rate of march. If the fallout area must be occupied, personnel can be relieved after a period of time by
other personnel. Work to be accomplished inside a fallout area can be completed more rapidly by prior
planning and by increasing the number of personnel to do the work.