NJ RADON MEASUREMENT TECHNICIAN
EXAM QUESTIONS AND ANSWERS UPDATED
2025 GRADED A+
,What does it mean for a radon decay product to be "plated out"? Ans
breathable object
✔✔ - It has attached to a non-
inhaled.
✔✔
If a radon decay product attaches to a solid object, such as a wall, it... Ans - ...can no longer be
What is a half-life? Ans
decay.
✔✔ - The time required for half of the atoms of a radioactive element to
✔✔
Which type of radiation is responsible for the most cellular damage associated with radon and radon
decay products? Ans - Alpha
The negatively charged subatomic particle that orbits the nucleus is called a(n) Ans ✔✔ - electron
Radon decay products that are not attached to airborne particles are much more likely to... Ans
deposit radiation into lung tissue if inhaled.
✔✔ -
The number of protons plus the number of neutrons in a specific atom is called Ans
number
✔✔ - Mass
The number of protons in an atom's nucleus is the same as the atom's... Ans ✔✔ - Atomic number
The commonly assumed equilibrium ratio of radon decay products is: Ans ✔✔ - 0.4
All atoms of the same element must have the same... Ans ✔✔ - Atomic number
, The number of ______________ in an atom determines which element it is. Ans ✔✔ - Protons
_________________ causes a neutral atom to become an ion. Ans ✔✔ - The gain or loss of electrons
________________ is a unit used to measure radon concentration. Ans
(pCi/L)
✔✔ - Picocurie per liter
When ___________ decays, it produces Radon-222 Ans ✔✔ - Radium-226
For an atom to be neutrally charged... Ans ✔✔ - 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? Ans - isotopes
What is the half-life of radon-222? Ans ✔✔ - 3.8 days
Stack effect is caused by... Ans✔✔ - Temperature differentials
3 factors that effect radon's ability to move through the soil: Ans
soil
✔✔ - 1. Size of mineral grain in the
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. Ans
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. Ans - FALSE: they do vary over relatively short periods of time.
EXAM QUESTIONS AND ANSWERS UPDATED
2025 GRADED A+
,What does it mean for a radon decay product to be "plated out"? Ans
breathable object
✔✔ - It has attached to a non-
inhaled.
✔✔
If a radon decay product attaches to a solid object, such as a wall, it... Ans - ...can no longer be
What is a half-life? Ans
decay.
✔✔ - The time required for half of the atoms of a radioactive element to
✔✔
Which type of radiation is responsible for the most cellular damage associated with radon and radon
decay products? Ans - Alpha
The negatively charged subatomic particle that orbits the nucleus is called a(n) Ans ✔✔ - electron
Radon decay products that are not attached to airborne particles are much more likely to... Ans
deposit radiation into lung tissue if inhaled.
✔✔ -
The number of protons plus the number of neutrons in a specific atom is called Ans
number
✔✔ - Mass
The number of protons in an atom's nucleus is the same as the atom's... Ans ✔✔ - Atomic number
The commonly assumed equilibrium ratio of radon decay products is: Ans ✔✔ - 0.4
All atoms of the same element must have the same... Ans ✔✔ - Atomic number
, The number of ______________ in an atom determines which element it is. Ans ✔✔ - Protons
_________________ causes a neutral atom to become an ion. Ans ✔✔ - The gain or loss of electrons
________________ is a unit used to measure radon concentration. Ans
(pCi/L)
✔✔ - Picocurie per liter
When ___________ decays, it produces Radon-222 Ans ✔✔ - Radium-226
For an atom to be neutrally charged... Ans ✔✔ - 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? Ans - isotopes
What is the half-life of radon-222? Ans ✔✔ - 3.8 days
Stack effect is caused by... Ans✔✔ - Temperature differentials
3 factors that effect radon's ability to move through the soil: Ans
soil
✔✔ - 1. Size of mineral grain in the
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. Ans
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. Ans - FALSE: they do vary over relatively short periods of time.
