Radon Measurement Final Exam All Possible Questions
and Answers 2024 with complete solution
What are the characteristics of radon?
Is not detected by human senses, is naturally occurring, and does not chemically react.
The nucleus of an atom consists of
protons and neutrons
What is the characteristic of an atom that determines which element it is?
The number of protons= atomic number
What are the annual average U.S outdoor and residential indoor radon levels?
Outdoor= 0.4 pCi/L
Indoors= 1.3 pCi/L
What is an ion?
an atom or molecule with a net electric charge due to the loss or gain of one or more
electrons.
What does one picoCurie per liter of radon produce?
2.2 disintegrations per minute within a liter of air.
How many hours does it take for radon to reach secular equilibrium with its short-
lived decay products?
4 Hours
If the radon concentration is 8 pCi/L and the ER is 0.4, what is the working level of
radon decay products?
0.032 WL
If the working level concentration is 0.03 WL and ER is 0.4, what is the radon
concentration in the room?
7.5 pCi/L
If the working level concentration is 0.06 and the radon concentration is 10 pCi/L,
what is the equilibrium ratio?
0.6
What is a measured in units called working levels?
A measure of the amount of radiation produced by the radon decay products.
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 container?
13 pCi/L
Which of the following radon progeny groups produce the alpha radiation
representing the greatest health concerns associated with radon?
Polonium 214 and Polonium 218
Which of the following types of radiation delivers the most energy per single
impact to living tissue?
Alpha Radiation
What composes an alpha particle?
2 Protons and 2 Neutrons
An equilibrium ratio is 0.4 typically been used when converting from working
level measurements to pCi/L. What does this mean?
, Of the radon decay products that were produced from the radon in the room, 40 percent
were measurable.
A measurement of 0.5 WL is made in a home. Using the equilibrium ratio
assumptions (0.4) what is the radon concentration?
125 pCi/L
Two simultaneous measurements for radon and radon decay products were made
in a room. The radon was 0.4 pCi/L and the working level was 0.01 WL. What is
the equilibrium ratio?
0.25
A measurement of 12.0 pCi/L is made in the home. If the equilibrium ratio is 4.0,
what is the working level?
0.048
Which would cause the equilibrium ratio to decrease?
Higher air circulation in a room
In order of penetrating power from least to penetrating to most penetrating, which
is correct?
Alpha-Beta-Gamma
What is a property of radon decay products?
They have a static charge
Two picoCuries per liter is equal to how many Becquerels per cubic meter?
74
What is the half life for radon?
3.8 days
What is the mass number for radon?
222
Radon has how many protons?
86
Radon has how many neutrons?
136
What is a major source of radon?
Emanation from soil
What represents the single greatest factor for increasing risk of lung cancer?
Tobacco Smoking
The health risk from radon for smokers is how much greater than that of never
smokers?
8 to 9 times
How many additional lung cancer does the EPA predict would happen if 1000
never smokers were exposed to 4 pCi/L of radon in the home?
7 times
How many additional lung cancer does the EPA predict would happen if 1000
smokers were exposed to 4 pCi/L in the home?
62 times
Which radon decay products are primarily responsible for the damage to lung
cells?
Polonium 218 and Polonium 214
What is the health risk due to alpha particles?
and Answers 2024 with complete solution
What are the characteristics of radon?
Is not detected by human senses, is naturally occurring, and does not chemically react.
The nucleus of an atom consists of
protons and neutrons
What is the characteristic of an atom that determines which element it is?
The number of protons= atomic number
What are the annual average U.S outdoor and residential indoor radon levels?
Outdoor= 0.4 pCi/L
Indoors= 1.3 pCi/L
What is an ion?
an atom or molecule with a net electric charge due to the loss or gain of one or more
electrons.
What does one picoCurie per liter of radon produce?
2.2 disintegrations per minute within a liter of air.
How many hours does it take for radon to reach secular equilibrium with its short-
lived decay products?
4 Hours
If the radon concentration is 8 pCi/L and the ER is 0.4, what is the working level of
radon decay products?
0.032 WL
If the working level concentration is 0.03 WL and ER is 0.4, what is the radon
concentration in the room?
7.5 pCi/L
If the working level concentration is 0.06 and the radon concentration is 10 pCi/L,
what is the equilibrium ratio?
0.6
What is a measured in units called working levels?
A measure of the amount of radiation produced by the radon decay products.
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 container?
13 pCi/L
Which of the following radon progeny groups produce the alpha radiation
representing the greatest health concerns associated with radon?
Polonium 214 and Polonium 218
Which of the following types of radiation delivers the most energy per single
impact to living tissue?
Alpha Radiation
What composes an alpha particle?
2 Protons and 2 Neutrons
An equilibrium ratio is 0.4 typically been used when converting from working
level measurements to pCi/L. What does this mean?
, Of the radon decay products that were produced from the radon in the room, 40 percent
were measurable.
A measurement of 0.5 WL is made in a home. Using the equilibrium ratio
assumptions (0.4) what is the radon concentration?
125 pCi/L
Two simultaneous measurements for radon and radon decay products were made
in a room. The radon was 0.4 pCi/L and the working level was 0.01 WL. What is
the equilibrium ratio?
0.25
A measurement of 12.0 pCi/L is made in the home. If the equilibrium ratio is 4.0,
what is the working level?
0.048
Which would cause the equilibrium ratio to decrease?
Higher air circulation in a room
In order of penetrating power from least to penetrating to most penetrating, which
is correct?
Alpha-Beta-Gamma
What is a property of radon decay products?
They have a static charge
Two picoCuries per liter is equal to how many Becquerels per cubic meter?
74
What is the half life for radon?
3.8 days
What is the mass number for radon?
222
Radon has how many protons?
86
Radon has how many neutrons?
136
What is a major source of radon?
Emanation from soil
What represents the single greatest factor for increasing risk of lung cancer?
Tobacco Smoking
The health risk from radon for smokers is how much greater than that of never
smokers?
8 to 9 times
How many additional lung cancer does the EPA predict would happen if 1000
never smokers were exposed to 4 pCi/L of radon in the home?
7 times
How many additional lung cancer does the EPA predict would happen if 1000
smokers were exposed to 4 pCi/L in the home?
62 times
Which radon decay products are primarily responsible for the damage to lung
cells?
Polonium 218 and Polonium 214
What is the health risk due to alpha particles?
