©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
NJ Radon Measurement Technician Exam
(Practice Questions) Questions And Answers
2025 Update.
What does it mean for a radon decay product to be "plated out"? - Answer✔It has attached to a
non-breathable object
If a radon decay product attaches to a solid object, such as a wall, it... - Answer✔...can no
longer be inhaled.
What is a half-life? - Answer✔The time required for half of the atoms of a radioactive element
to decay.
Which type of radiation is responsible for the most cellular damage associated with radon and
radon decay products? - Answer✔Alpha
The negatively charged subatomic particle that orbits the nucleus is called a(n) -
Answer✔electron
Radon decay products that are not attached to airborne particles are much more likely to... -
Answer✔deposit radiation into lung tissue if inhaled.
The number of protons plus the number of neutrons in a specific atom is called - Answer✔Mass
number
The number of protons in an atom's nucleus is the same as the atom's... - Answer✔Atomic
number
The commonly assumed equilibrium ratio of radon decay products is: - Answer✔0.4
All atoms of the same element must have the same... - Answer✔Atomic number
The number of ______________ in an atom determines which element it is. - Answer✔Protons
_________________ causes a neutral atom to become an ion. - Answer✔The gain or loss of
electrons
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
________________ is a unit used to measure radon concentration. - Answer✔Picocurie per liter
(pCi/L)
When ___________ decays, it produces Radon-222 - Answer✔Radium-226
For an atom to be neutrally charged... - Answer✔it's number of protons and electrons must be
equal.
Different atoms of the same element can have differing numbers of neutrons. What are these
different kinds of the same element called? - Answer✔isotopes
What is the half-life of radon-222? - Answer✔3.8 days
Stack effect is caused by... - Answer✔Temperature differentials
3 factors that effect radon's ability to move through the soil: - Answer✔1. Size of mineral grain
in the soil
2. Dryness of the soil
3. Permeability of the soil
(T/F) There is a strong correlation between low ventilation rates and high radon levels. -
Answer✔False: there is not a strong correlation
(T/F) Radon entry, and therefore indoor radon concentrations, do not vary over relatively short
periods of time. - Answer✔FALSE: they do vary over relatively short periods of time.
All of the following are driving forces that can bring radon into a home except:
- Diffusion
- Evaporation
- Emanation
- Well water - Answer✔Evaporation
The area below the neutral pressure plane in a home... - Answer✔Draws air into the home
The 3 major factors of radon entry into a home are: - Answer✔- Radon source strength
- Transport of radon
- ventilation rate
Radon plays what role in the average American's annual radiation exposure? - Answer✔It is the
2nd greatest contributor.
The EPA estimates that the risk of lung cancer death for a current smoker with a constant radon
exposure of 4 pCi/L is _____________ in 1,000. - Answer✔62
2
NJ Radon Measurement Technician Exam
(Practice Questions) Questions And Answers
2025 Update.
What does it mean for a radon decay product to be "plated out"? - Answer✔It has attached to a
non-breathable object
If a radon decay product attaches to a solid object, such as a wall, it... - Answer✔...can no
longer be inhaled.
What is a half-life? - Answer✔The time required for half of the atoms of a radioactive element
to decay.
Which type of radiation is responsible for the most cellular damage associated with radon and
radon decay products? - Answer✔Alpha
The negatively charged subatomic particle that orbits the nucleus is called a(n) -
Answer✔electron
Radon decay products that are not attached to airborne particles are much more likely to... -
Answer✔deposit radiation into lung tissue if inhaled.
The number of protons plus the number of neutrons in a specific atom is called - Answer✔Mass
number
The number of protons in an atom's nucleus is the same as the atom's... - Answer✔Atomic
number
The commonly assumed equilibrium ratio of radon decay products is: - Answer✔0.4
All atoms of the same element must have the same... - Answer✔Atomic number
The number of ______________ in an atom determines which element it is. - Answer✔Protons
_________________ causes a neutral atom to become an ion. - Answer✔The gain or loss of
electrons
1
, ©THESTAR 2024/2025 ALL RIGHTS RESERVED 12:54PM.
________________ is a unit used to measure radon concentration. - Answer✔Picocurie per liter
(pCi/L)
When ___________ decays, it produces Radon-222 - Answer✔Radium-226
For an atom to be neutrally charged... - Answer✔it's number of protons and electrons must be
equal.
Different atoms of the same element can have differing numbers of neutrons. What are these
different kinds of the same element called? - Answer✔isotopes
What is the half-life of radon-222? - Answer✔3.8 days
Stack effect is caused by... - Answer✔Temperature differentials
3 factors that effect radon's ability to move through the soil: - Answer✔1. Size of mineral grain
in the soil
2. Dryness of the soil
3. Permeability of the soil
(T/F) There is a strong correlation between low ventilation rates and high radon levels. -
Answer✔False: there is not a strong correlation
(T/F) Radon entry, and therefore indoor radon concentrations, do not vary over relatively short
periods of time. - Answer✔FALSE: they do vary over relatively short periods of time.
All of the following are driving forces that can bring radon into a home except:
- Diffusion
- Evaporation
- Emanation
- Well water - Answer✔Evaporation
The area below the neutral pressure plane in a home... - Answer✔Draws air into the home
The 3 major factors of radon entry into a home are: - Answer✔- Radon source strength
- Transport of radon
- ventilation rate
Radon plays what role in the average American's annual radiation exposure? - Answer✔It is the
2nd greatest contributor.
The EPA estimates that the risk of lung cancer death for a current smoker with a constant radon
exposure of 4 pCi/L is _____________ in 1,000. - Answer✔62
2
