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About FEMA IS-303
FEMA IS 303: Radiological Accident Assessment Concepts has 32 questions. These Questions are given below. Learning is free and so is this page. We recommend studying well and practicing and check the answers in case you get stuck in a doubt.
NOTE: Don’t use this as CheatSheet but as self-preparatory notes
1. True or False: Tap water used for drinking is considered in the DIL calculations.
2. What is the EPA intermediate-phase relocation PAG for the first year?
0.5 rem TEDE
1 rem TEDE
2 rem TEDE
5 rem TEDE
3. During a release, which of the field measurements described below indicates an appropriate location to take an air sample to be used
for dose projections?
Open-window readings that significantly exceed closed-window readings at ground level; open-window readings are not significantly different than closed-window at 1 meter
Open-window readings that significantly exceed closed-window readings at 1 meter
Open window and closed window readings are not necessary for determining an appropriate location for an air sample
The absence of a significant difference between open and closed-window readings at 1 meter and ground level
4. Food samples analyzed after a release have been determined to have the following concentrations:
< Sr-90 150 Bq/kg
I-131 120 Bq/kg
Cs-134 + Cs-137 1150 Bq/kg
Is the food permitted to be released into commerce?
5. A volunteer firefighter is functioning as an emergency worker for the county during a reactor accident. The firefighter’s full-time job is as a nuclear medicine technologist at a local hospital, and her annual occupational exposure-to-date is 2.5 rem. What additional dose may the firefighter receive as an emergency worker during the early phase?
No additional dose
An additional 2.5 rem
The emergency worker dose limit minus 2.5 rem
The full emergency worker dose limit without any subtraction
6. What dosage (mg) of KI is recommended for a 15 year old that weighs more than 70 kg?
7. At what projected CDE thyroid dose is potassium iodide recommended for an adult over the age of 40?
8. What is the purpose of a hot line?
To identify samples and data collection according to their date, time, and place of collection
To separate contaminated and noncontaminated areas
To determine which groups of emergency workers are capable of collecting samples
To measure the distance between one collection location to another
9. All of the following are likely to happen to the fuel cladding 15–45 minutes after the core is uncovered EXCEPT:
Local fuel melting
Direct Containment Heating (DCH)
10. True or False: Under special circumstances, state and local officials may permit the usage of food with concentrations exceeding the DILs.
11. Given the following data, determine the airborne concentration of the contaminant in microCi/cm3:
Background count: 225 cpm
Gross count: 125,768 cpm
Sample time: 5 min
Flow rate: 2.35 cfm
Detector efficiency: 2.5%
Collector efficiency: 99.9%
6.8 x 10⁻³ microCi/cm³
6.8 x 10⁻¹¹ microCi/cm³
6.8 x 10⁻⁶ microCi/cm³
12. In equations used to calculate concentration of radioactive material, mu (µ) represents which of the following?
Wind speed at ground level
13. Ingestion of a radionuclide yielded a committed dose equivalent of 20 rem to the red bone marrow. Calculate the CEDE.
2.4 rem CEDE
24 rem CEDE
.6 rem CEDE
6 rem CEDE
14. An adult (age 30) is projected to receive a CDE thyroid dose of 10 rem. What dosage of KI is recommended?
. 130 mg
KI is not recommended for a CDE thyroid dose of 10 rem
15. Which of the following is NOT one of the possible exposure pathways for radiation exposure from a nuclear incident?
16. Convert 12.6 mph to m/sec.
17. The first priority of protective actions is to:
Prevent deterministic health effects
Prevent stochastic health effects
Ensure that emergency workers receive a dose As Low As Reasonably Achievable (ALARA)
Relocate the public to a safe location
18. When doing field analysis using a pancake probe, the following media are acceptable for radioiodine sampling in the presence of noble gases EXCEPT:
Silver silica gel
19. Which of the following is NOT a potential health effect of radiation?
Brain damage to the unborn
Thyroid disorders and cancers
20. What dosage (mg) of KI is recommended for children over 3 through 12 years old?
KI is not recommended for children under the age of 12
21. A package label specifies the activity of the contents as 0.074 TBq. What is the activity in millicuries?
22. It is morning, with moderate incoming solar radiation. The wind speed is 7 m/se
According to the EPA’s Workbook of Atmospheric Dispersion Estimates, what is the atmospheric stability class?
Stability Class A
Stability Class B
Stability Class C
Stability Class D
23. Potassium iodide is most effective as a thyroid blocking agent when it is administered within what time frame?
1 day prior to exposure
3 to 4 hours prior to exposure
1 to 2 hours prior to exposure
6 hours after exposure
24. A utility worker lives in a slightly contaminated area outside the restricted zone surrounding an accident site. His projected first-year dose from living in this area is 250 mrem. This worker must enter the restricted zone to perform vital maintenance functions. What further annual dose may he accumulate?
No additional dose
The occupational worker dose limit minus 250 mrem
The occupational worker dose limit minus 250 mrem and any dose received during the early phase
The full occupational worker dose limit without any subtraction
25. Which of the following is NOT a type of containment failure?
Direct Containment Heating (DCH)
26. The projected CDE to the thyroids of the public at a downwind location is 4 rem. Has the EPA early-phase PAG been exceeded?
27. Convert 5.13 x 10⁻³ Sv/Bq to mrem/pCi.
1.39 x 10⁻⁴ mrem/pCi
1.39 x 10⁻⁶ mrem/pCi
28. Which of the following is NOT an SI unit of measure?
29. Of the following indicators, which one confirms core damage?
Safety function status
30. What is the time period considered for contaminated food consumption in the DIL calculation?
6 months, except for I-131 and Ru-103
1 year, except for I-131 and Ru-103
31. According to NUREG-0654/FEMA REP-1, rev. 1, how often are phone numbers required to be updated in procedures for personnel notification?
32. A dose of 5 rem has been calculated at 5 km from a release point. The atmospheric stability class is Class F. Using the Reduction Factor Table, determine how far someone would have to be from the release to receive 1 rem.
. 3.5 km
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