RADON MEASUREMENT FINAL
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100% CORRECT |
NEW UPDATE 2025
What are the characteristics of radon? - ANSWER Is not detected by human
senses, is naturally occurring, and does not chemically react.
The nucleus of an atom consists of - ANSWER protons and neutrons
What is the characteristic of an atom that determines which element it is? -
ANSWER The number of protons= atomic number
What are the annual average U.S outdoor and residential indoor radon levels? -
ANSWER Outdoor= 0.4 pCi/L
Indoors= 1.3 pCi/L
What is an ion? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 0.6
What is a measured in units called working levels? - ANSWER 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? - ANSWER 13 pCi/L
Which of the following radon progeny groups produce the alpha radiation
representing the greatest health concerns associated with radon? - ANSWER
Polonium 214 and Polonium 218
Which of the following types of radiation delivers the most energy per single
impact to living tissue? - ANSWER Alpha Radiation
What composes an alpha particle? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 0.048
Which would cause the equilibrium ratio to decrease? - ANSWER Higher air
circulation in a room
In order of penetrating power from least to penetrating to most penetrating,
which is correct? - ANSWER Alpha-Beta-Gamma
What is a property of radon decay products? - ANSWER They have a static
charge
Two picoCuries per liter is equal to how many Becquerels per cubic meter? -
ANSWER 74
QUESTIONS AND ANSWERS WITH
COMPLETE SOLUTIONS 100% CORRECT |
NEW UPDATE 2025
What are the characteristics of radon? - ANSWER Is not detected by human
senses, is naturally occurring, and does not chemically react.
The nucleus of an atom consists of - ANSWER protons and neutrons
What is the characteristic of an atom that determines which element it is? -
ANSWER The number of protons= atomic number
What are the annual average U.S outdoor and residential indoor radon levels? -
ANSWER Outdoor= 0.4 pCi/L
Indoors= 1.3 pCi/L
What is an ion? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 0.6
What is a measured in units called working levels? - ANSWER 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? - ANSWER 13 pCi/L
Which of the following radon progeny groups produce the alpha radiation
representing the greatest health concerns associated with radon? - ANSWER
Polonium 214 and Polonium 218
Which of the following types of radiation delivers the most energy per single
impact to living tissue? - ANSWER Alpha Radiation
What composes an alpha particle? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 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? - ANSWER 0.048
Which would cause the equilibrium ratio to decrease? - ANSWER Higher air
circulation in a room
In order of penetrating power from least to penetrating to most penetrating,
which is correct? - ANSWER Alpha-Beta-Gamma
What is a property of radon decay products? - ANSWER They have a static
charge
Two picoCuries per liter is equal to how many Becquerels per cubic meter? -
ANSWER 74
