AMMO – 66 RADIATION SAFETY PRACTICE
EXAM QUESTIONS AND ANSWERS LATEST
UPDATED 2025
1. Question: What is ionizing radiation? Answer: Ionizing radiation is
radiation with enough energy to remove electrons from atoms, creating
ions.
2. Question: What are the four primary types of ionizing radiation?
Answer: Alpha particles, beta particles, gamma rays, and neutrons.
3. Question: Which type of radiation has the highest ionizing power but
lowest penetrating power? Answer: Alpha particles.
4. Question: Which type of radiation has the lowest ionizing power but
highest penetrating power? Answer: Gamma rays.
5. Question: What is a rad? Answer: Rad (Radiation Absorbed Dose) is a
unit of absorbed radiation dose equal to 100 ergs of energy per gram of
tissue.
6. Question: What is a rem? Answer: Rem (Roentgen Equivalent Man) is a
unit that measures the biological effect of radiation on human tissue.
7. Question: What is the SI unit for absorbed dose? Answer: Gray (Gy),
where 1 Gy = 100 rad.
8. Question: What is the SI unit for dose equivalent? Answer: Sievert (Sv),
where 1 Sv = 100 rem.
9. Question: What is the relationship between roentgen, rad, and rem for
gamma radiation? Answer: For gamma radiation in air, 1 roentgen ≈ 1
rad ≈ 1 rem.
10.Question: Define half-life. Answer: Half-life is the time required for half
of the radioactive atoms in a sample to decay.
Radiation Detection and Measurement
11.Question: What is the purpose of a Geiger-Mueller (G-M) counter?
Answer: To detect and measure ionizing radiation by measuring the
electrical pulse produced when radiation ionizes gas in the detector.
12.Question: Which type of survey meter is best for detecting alpha
particles? Answer: Thin window Geiger-Mueller detectors or zinc sulfide
scintillation detectors.
, 13.Question: What is the advantage of a scintillation detector over a G-M
tube? Answer: Scintillation detectors have higher efficiency for gamma
detection and can measure energy levels.
14.Question: What is a dosimeter used for? Answer: A dosimeter measures
an individual's accumulated radiation dose over a period of time.
15.Question: What is the difference between a survey meter and a
dosimeter? Answer: Survey meters measure radiation dose rates at a
specific time and location, while dosimeters measure accumulated dose
over time.
16.Question: What is a TLD (Thermoluminescent Dosimeter)? Answer: A
passive dosimeter that uses thermoluminescent material to measure
accumulated radiation dose.
17.Question: What is the primary purpose of an alarming rate meter?
Answer: To provide immediate audible and/or visual warning when
radiation levels exceed preset thresholds.
18.Question: What is background radiation? Answer: Naturally occurring
radiation from the environment that is always present.
19.Question: Why must survey instruments be calibrated? Answer: To
ensure accurate and reliable measurements of radiation.
20.Question: What is the purpose of performing an operational check on a
survey meter? Answer: To verify the instrument is functioning properly
before use.
Biological Effects of Radiation
21.Question: What is the difference between stochastic and deterministic
effects of radiation? Answer: Stochastic effects have a probability of
occurrence that increases with dose, while deterministic effects have a
threshold dose below which they do not occur.
22.Question: What is the most radiosensitive organ in the human body?
Answer: Bone marrow is among the most radiosensitive organs.
23.Question: What is acute radiation syndrome? Answer: A collection of
health effects that occur within 24 hours of exposure to high doses of
radiation.
24.Question: At what whole-body dose (in rem) do symptoms of acute
radiation syndrome begin to appear? Answer: Symptoms begin to appear
at doses above approximately 100 rem (1 Sv).
25.Question: What are the three major stages of acute radiation syndrome?
Answer: Prodromal stage, latent stage, and manifest illness stage.
26.Question: What is the primary stochastic effect of concern from radiation
exposure? Answer: Cancer induction.
EXAM QUESTIONS AND ANSWERS LATEST
UPDATED 2025
1. Question: What is ionizing radiation? Answer: Ionizing radiation is
radiation with enough energy to remove electrons from atoms, creating
ions.
2. Question: What are the four primary types of ionizing radiation?
Answer: Alpha particles, beta particles, gamma rays, and neutrons.
3. Question: Which type of radiation has the highest ionizing power but
lowest penetrating power? Answer: Alpha particles.
4. Question: Which type of radiation has the lowest ionizing power but
highest penetrating power? Answer: Gamma rays.
5. Question: What is a rad? Answer: Rad (Radiation Absorbed Dose) is a
unit of absorbed radiation dose equal to 100 ergs of energy per gram of
tissue.
6. Question: What is a rem? Answer: Rem (Roentgen Equivalent Man) is a
unit that measures the biological effect of radiation on human tissue.
7. Question: What is the SI unit for absorbed dose? Answer: Gray (Gy),
where 1 Gy = 100 rad.
8. Question: What is the SI unit for dose equivalent? Answer: Sievert (Sv),
where 1 Sv = 100 rem.
9. Question: What is the relationship between roentgen, rad, and rem for
gamma radiation? Answer: For gamma radiation in air, 1 roentgen ≈ 1
rad ≈ 1 rem.
10.Question: Define half-life. Answer: Half-life is the time required for half
of the radioactive atoms in a sample to decay.
Radiation Detection and Measurement
11.Question: What is the purpose of a Geiger-Mueller (G-M) counter?
Answer: To detect and measure ionizing radiation by measuring the
electrical pulse produced when radiation ionizes gas in the detector.
12.Question: Which type of survey meter is best for detecting alpha
particles? Answer: Thin window Geiger-Mueller detectors or zinc sulfide
scintillation detectors.
, 13.Question: What is the advantage of a scintillation detector over a G-M
tube? Answer: Scintillation detectors have higher efficiency for gamma
detection and can measure energy levels.
14.Question: What is a dosimeter used for? Answer: A dosimeter measures
an individual's accumulated radiation dose over a period of time.
15.Question: What is the difference between a survey meter and a
dosimeter? Answer: Survey meters measure radiation dose rates at a
specific time and location, while dosimeters measure accumulated dose
over time.
16.Question: What is a TLD (Thermoluminescent Dosimeter)? Answer: A
passive dosimeter that uses thermoluminescent material to measure
accumulated radiation dose.
17.Question: What is the primary purpose of an alarming rate meter?
Answer: To provide immediate audible and/or visual warning when
radiation levels exceed preset thresholds.
18.Question: What is background radiation? Answer: Naturally occurring
radiation from the environment that is always present.
19.Question: Why must survey instruments be calibrated? Answer: To
ensure accurate and reliable measurements of radiation.
20.Question: What is the purpose of performing an operational check on a
survey meter? Answer: To verify the instrument is functioning properly
before use.
Biological Effects of Radiation
21.Question: What is the difference between stochastic and deterministic
effects of radiation? Answer: Stochastic effects have a probability of
occurrence that increases with dose, while deterministic effects have a
threshold dose below which they do not occur.
22.Question: What is the most radiosensitive organ in the human body?
Answer: Bone marrow is among the most radiosensitive organs.
23.Question: What is acute radiation syndrome? Answer: A collection of
health effects that occur within 24 hours of exposure to high doses of
radiation.
24.Question: At what whole-body dose (in rem) do symptoms of acute
radiation syndrome begin to appear? Answer: Symptoms begin to appear
at doses above approximately 100 rem (1 Sv).
25.Question: What are the three major stages of acute radiation syndrome?
Answer: Prodromal stage, latent stage, and manifest illness stage.
26.Question: What is the primary stochastic effect of concern from radiation
exposure? Answer: Cancer induction.
