Critical Task: 031-506-2015

In this lesson you will learn how to compute total dose received by personnel operating in or crossing a

radiation area.

Compute total dose.

Given information about and illustrations on the procedures for using the total dose

nomogram or the M28A1 Nuclear Calculator Set to compute the total dose of

radiation received by personnel operating in or crossing a radiation area when the

dose rate, time of stay, time of entry, and transmission factor are known.

Demonstrate competency of the task skills and knowledge by responding to the

multiple-choice test covering the computation of total radiation dose using the total

dose nomogram or the M28A1 Nuclear Calculator Set.

In order for commanders to control the amount of radiation, they must be able to estimate how much

radiation will be absorbed operating in or crossing a contaminated area. The dose rate of radiation does

not directly determine whether or not personnel become casualties. Casualties are dependent on the total

dose received. Though this subcourse teaches the procedures for calculating total radiation dosages that

personnel may receive, the actual total dose received will be taken from dosimeter readings. If the dose

rate were constant, the total dose would simply be the product of the time in the contaminated area and

the dose rate. However, the dose rate is continually diminishing because of decay; making the

calculation more complicated.