Lesson 2/Learning Event 7
Step 1. You do NOT know the total cumulative dose of the survey party.
Step 2. You know the commander does not want to exceed a moderate risk.
Step 3. You determine from the degree of risk exposure chart (figure 17 on page 64) that an RES-1 unit
can receive a additional dose of up to 30 cGy(rad) before exceeding a moderate risk.
Step 4. Based on the Information above, the battalion commander established an Operation Exposure
Guide of no more than 30 cGy(rad) for the survey party in this operation.
Establishing an Operation Exposure Guide When the Total Cumulative Dose IS Known. A battalion
commander plans to conduct a ground survey in a radiologically contaminated area. He will accept a
moderate risk. The survey party members all come from the same unit which has a total cumulative
dose of 20 cGy(rad). What Operation Exposure Guide will the commander establish for this survey
Step 1. You know the total cumulative dose of the survey party is 20 cGy(rad).
Step 2. You know the commander will accept a moderate risk.
Step 3. Subtract the known total cumulative dose of 20 cGy(rad) from the RS-0 criterion for the desired
degree of risk (figure 17). In this example the moderate risk dose is 70 cGy(rad).
Step 4. The answer from step 3 is 50 cGy(rad). This means that the survey party can receive an
additional dose of up to 50 cGy(rad) before exceeding a moderate risk.
Step 5. Based on the above information, the battalion commander establishes an Operation Exposure
Guide of no more than 50 cGy(rad) for the survey party in this operation.
Turn-back Dose Rate.
An Operation Exposure Guide for nuclear radiation
is specified by the
commander who ordered the survey. The control party will calculate and furnish turn-back dose rates.
(It is pointed out that these methods of calculation provide only rough estimates and are given for
planning purposes only.)