NEW JERSEY RADON TECHNICIAN
REVIEW EXAM QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
(d) is not detected by human senses, is naturally occurring, does not chemically react -
ANS Which of the following are characteristics of radon?
(a) has no static charge, solid particle, does not react chemically
(b) is a gas, radioactive, can be detected by human senses
(c) is man-made, does not chemically react, is a gas
(d) is not detected by human senses, is naturally occurring, does not chemically react
(c) protons and neutrons - ANS The nucleus of an atom consists of:
(a) electrons and protons
(b) neutrons and electrons
(c) protons and neutrons
(d) protons, neutrons and electrons
(c) the number of protons - ANS The characteristic of an atom that determines which
element it is is:
(a) the number of electrons
(b) the number of neutrons
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,(c) the number of protons
(d) the number of protons and neutrons
(a) 0.4 pCi/L outdoors and 1.3 pCi/L indoors - ANS The annual average U.S. outdoor and
indoor radon levels are:
(a) 0.4 pCi/L outdoors and 1.3 pCi/L indoors
(b) 0.5 pCi/L outdoors and 4.0 pCi/L indoors
(c) 0.6 pCi/L outdoors and 4.0 pCi/L indoors
(d) 0.7 pCi/L outdoors and 1.3 pCi/L indoors
(c) has lost or gained electrons - ANS An ion is an atom that:
(a) cannot accept additional electrons
(b) cannot eliminate additional electrons
(c) has lost or gained electrons
(d) has no electrons
(c) 2.22 disintegrations per minute within a liter of air - ANS One picoCurie per liter of radon
is defined as:
(a) one billionth of a Curie
(b) 2.22 disintegrations per minute per gram of air
(c) 2.22 disintegrations per minute within a liter of air
(d) 37 billion disintegrations per second
(a) 4 hours - ANS It takes _____ hours for radon to reach secular equilibrium with its short-
lived decay products.
(a) 4 hours
(b) 12 hours
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,(c) 24 hours
(d) 48 hours
(b) 0.034 WL - ANS If the radon concentration is 8 pCi/L what is the Working Level of radon
decay products using common assumptions of equilibrium ER = 0.4?
(a) 0.024 WL
(b) 0.034 WL
(c) 0.040 WL
(d) 0.048 WL
(b) 7.5 pCi/L - ANS If the Working Level concentration is 0.03 WL, using common assumptions
of equilibrium (ER = 0.4), what is the radon concentration in the room?
(a) 10.0 pCi/L
(b) 7.5 pCi/L
(c) 6.0 pCi/L
(d) 5.0 pCi/L
(b) 0.6 - ANS If the Working Level concentration is 0.06 and the radon concentration is 10
pCi/L, what is the Equilibrium Ratio?
(a) 0.4
(b) 0.6
(c) 1.0
(d) 4.0
(d) Radon 222 once formed, disappears in 3.8 days - ANS Which of the following is an
INCORRECT statement?
(a) Radon 222 is a radioactive gas
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, (b) Radon 222 is day product of radium
(c) Radon 222 is an inert gas
(d) Radon 222 once formed, disappears in 3.8 days
(a) a measurement of 0.016 WL of radon decay products means 4 pCi/L of radon exists in the
room - ANS Which of the following is NOT necessarily a correct statement?
(a) a measurement of 0.016 WL of radon decay products means 4 pCi/L of radon exists in the
room
(b) one picoCurie is one trillionth of a Curie
(c) one pCi/L is equal to 2.2 disintegration's in a liter of air in a minute
(d) WL is defined as the alpha energy released from radon decay products
(b) a measure of the amount of radiation produced by the radon decay products -
ANS Working Level is a measure of:
(a) a location of work within a uranium mine
(b) a measure of the amount of radiation produced by the radon decay products
(c) a time-dose measure of the exposure to radon decay products
(d) a measure of the amount of radiation produced by radon gas
(a) 13 pCi/L - ANS One-hundred (100) pCi/L of radon is inside a radon proof container. If the
container is re-measured in 11 1/2 days later, approximately how much radon is left in the
counter?
(a) 13 pCi/L
(b) 25 pCi/L
(c) 50 pCi/L
(d) 75 pCi/L
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REVIEW EXAM QUESTIONS AND
ANSWERS GRADED A+ 2025/2026
(d) is not detected by human senses, is naturally occurring, does not chemically react -
ANS Which of the following are characteristics of radon?
(a) has no static charge, solid particle, does not react chemically
(b) is a gas, radioactive, can be detected by human senses
(c) is man-made, does not chemically react, is a gas
(d) is not detected by human senses, is naturally occurring, does not chemically react
(c) protons and neutrons - ANS The nucleus of an atom consists of:
(a) electrons and protons
(b) neutrons and electrons
(c) protons and neutrons
(d) protons, neutrons and electrons
(c) the number of protons - ANS The characteristic of an atom that determines which
element it is is:
(a) the number of electrons
(b) the number of neutrons
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,(c) the number of protons
(d) the number of protons and neutrons
(a) 0.4 pCi/L outdoors and 1.3 pCi/L indoors - ANS The annual average U.S. outdoor and
indoor radon levels are:
(a) 0.4 pCi/L outdoors and 1.3 pCi/L indoors
(b) 0.5 pCi/L outdoors and 4.0 pCi/L indoors
(c) 0.6 pCi/L outdoors and 4.0 pCi/L indoors
(d) 0.7 pCi/L outdoors and 1.3 pCi/L indoors
(c) has lost or gained electrons - ANS An ion is an atom that:
(a) cannot accept additional electrons
(b) cannot eliminate additional electrons
(c) has lost or gained electrons
(d) has no electrons
(c) 2.22 disintegrations per minute within a liter of air - ANS One picoCurie per liter of radon
is defined as:
(a) one billionth of a Curie
(b) 2.22 disintegrations per minute per gram of air
(c) 2.22 disintegrations per minute within a liter of air
(d) 37 billion disintegrations per second
(a) 4 hours - ANS It takes _____ hours for radon to reach secular equilibrium with its short-
lived decay products.
(a) 4 hours
(b) 12 hours
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,(c) 24 hours
(d) 48 hours
(b) 0.034 WL - ANS If the radon concentration is 8 pCi/L what is the Working Level of radon
decay products using common assumptions of equilibrium ER = 0.4?
(a) 0.024 WL
(b) 0.034 WL
(c) 0.040 WL
(d) 0.048 WL
(b) 7.5 pCi/L - ANS If the Working Level concentration is 0.03 WL, using common assumptions
of equilibrium (ER = 0.4), what is the radon concentration in the room?
(a) 10.0 pCi/L
(b) 7.5 pCi/L
(c) 6.0 pCi/L
(d) 5.0 pCi/L
(b) 0.6 - ANS If the Working Level concentration is 0.06 and the radon concentration is 10
pCi/L, what is the Equilibrium Ratio?
(a) 0.4
(b) 0.6
(c) 1.0
(d) 4.0
(d) Radon 222 once formed, disappears in 3.8 days - ANS Which of the following is an
INCORRECT statement?
(a) Radon 222 is a radioactive gas
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, (b) Radon 222 is day product of radium
(c) Radon 222 is an inert gas
(d) Radon 222 once formed, disappears in 3.8 days
(a) a measurement of 0.016 WL of radon decay products means 4 pCi/L of radon exists in the
room - ANS Which of the following is NOT necessarily a correct statement?
(a) a measurement of 0.016 WL of radon decay products means 4 pCi/L of radon exists in the
room
(b) one picoCurie is one trillionth of a Curie
(c) one pCi/L is equal to 2.2 disintegration's in a liter of air in a minute
(d) WL is defined as the alpha energy released from radon decay products
(b) a measure of the amount of radiation produced by the radon decay products -
ANS Working Level is a measure of:
(a) a location of work within a uranium mine
(b) a measure of the amount of radiation produced by the radon decay products
(c) a time-dose measure of the exposure to radon decay products
(d) a measure of the amount of radiation produced by radon gas
(a) 13 pCi/L - ANS One-hundred (100) pCi/L of radon is inside a radon proof container. If the
container is re-measured in 11 1/2 days later, approximately how much radon is left in the
counter?
(a) 13 pCi/L
(b) 25 pCi/L
(c) 50 pCi/L
(d) 75 pCi/L
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