RADON TEST SPRUCE FINAL EXAM SCRIPT
2026 EXAM Q&A STUDY GUIDE UPDATED 2026
◉ The nucleus of an atom consists of
a. electrons and protons
b. neutrons and electrons
c. protons and neutrons
d. protons, neutrons, and electrons. Answer: c. protons and neutrons
◉ The characteristic of an atom that determines which element it is
a. number of electrons
b. number of neutrons
c. number of protons
d. number of protons and neutrons. Answer: c. number of protons
◉ The annual average of outdoor and indoor Radon levels are
a. 0.4 pCi/L outdoors; 1.3 pCi/L indoors
b. 0.5 pCi/L outdoors; 4.0 pCi/L indoors
,c. 0.6 pCi/L outdoors; 4.0 pCi/L indoors
d. 0.7 pCi/L outdoors; 1.3 pCi/L indoors. Answer: a. 0.4 pCi/L outdoors;
1.3 pCi/L indoors
◉ 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. Answer: c. has lost or gained electrons
◉ 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. Answer: c. 2.22 disintegrations
per minute within a liter of air
◉ It takes ________ hours for Radon to reach secular equilibrium with
its short lived decay products.
a. 4 hours
,b. 12 hours
c. 24 hours
d. 48 hours. Answer: a. 4 hours
◉ If the Radon concentration is 8 pCi/L what is the working level of
Radon Decay Products using common assumptions of equilibrium?
a. 0.02 WL
b. 0.04 WL
c. 0.50 WL
d. 1.00 WL. Answer: b. 0.04 WL
◉ If the Working Level concentration is 0.03 WL, using common
assumptions of equilibrium what is the Radon concentration in the
room?
a. 0.5 pCi/L
b. 2.0 pCi/L
c. 4.0 pCi/L
d. 6.0 pCi/L. Answer: d. 6.0 pCi/L
◉ 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. Answer: b. 0.6
◉ Which of the following is an incorrect statement?
a. Radon 222 is a radioactive gas.
b. Radon 222 is a product of radium.
c. Radon 222 is an inert gas.
d. Radon 222, once formed, disappears in 3.8 days.. Answer: d. Radon
222, once formed, disappeared in 3.8 days.
◉ Which of the following is not necessarily a correct statement?
a. A measurement of 0.02 WL of RDP 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 2.22 disintegrations in a liter of air in a minute.
d. WL is defined as the alpha energy released from RDP.. Answer: a. A
measurement of 0.02 WL of RDP means 4 pCi/L of Radon exists in the
room.
2026 EXAM Q&A STUDY GUIDE UPDATED 2026
◉ The nucleus of an atom consists of
a. electrons and protons
b. neutrons and electrons
c. protons and neutrons
d. protons, neutrons, and electrons. Answer: c. protons and neutrons
◉ The characteristic of an atom that determines which element it is
a. number of electrons
b. number of neutrons
c. number of protons
d. number of protons and neutrons. Answer: c. number of protons
◉ The annual average of outdoor and indoor Radon levels are
a. 0.4 pCi/L outdoors; 1.3 pCi/L indoors
b. 0.5 pCi/L outdoors; 4.0 pCi/L indoors
,c. 0.6 pCi/L outdoors; 4.0 pCi/L indoors
d. 0.7 pCi/L outdoors; 1.3 pCi/L indoors. Answer: a. 0.4 pCi/L outdoors;
1.3 pCi/L indoors
◉ 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. Answer: c. has lost or gained electrons
◉ 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. Answer: c. 2.22 disintegrations
per minute within a liter of air
◉ It takes ________ hours for Radon to reach secular equilibrium with
its short lived decay products.
a. 4 hours
,b. 12 hours
c. 24 hours
d. 48 hours. Answer: a. 4 hours
◉ If the Radon concentration is 8 pCi/L what is the working level of
Radon Decay Products using common assumptions of equilibrium?
a. 0.02 WL
b. 0.04 WL
c. 0.50 WL
d. 1.00 WL. Answer: b. 0.04 WL
◉ If the Working Level concentration is 0.03 WL, using common
assumptions of equilibrium what is the Radon concentration in the
room?
a. 0.5 pCi/L
b. 2.0 pCi/L
c. 4.0 pCi/L
d. 6.0 pCi/L. Answer: d. 6.0 pCi/L
◉ 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. Answer: b. 0.6
◉ Which of the following is an incorrect statement?
a. Radon 222 is a radioactive gas.
b. Radon 222 is a product of radium.
c. Radon 222 is an inert gas.
d. Radon 222, once formed, disappears in 3.8 days.. Answer: d. Radon
222, once formed, disappeared in 3.8 days.
◉ Which of the following is not necessarily a correct statement?
a. A measurement of 0.02 WL of RDP 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 2.22 disintegrations in a liter of air in a minute.
d. WL is defined as the alpha energy released from RDP.. Answer: a. A
measurement of 0.02 WL of RDP means 4 pCi/L of Radon exists in the
room.
