Radon Exam UPDATED Questions and
CORRECT Answers
According to the US EPA Citizens Guide to Radon, radon levels in most homes, can be
reduced to: - CORRECT ANSWER- 2 pCi/L or less
Homeowners should be advised to have their mitigation contractors stipulate that they will
follow: - CORRECT ANS...
Radon Exam UPDATED Questions and
CORRECT Answers
According to the US EPA Citizens Guide to Radon, radon levels in most homes, can be
reduced to: - CORRECT ANSWER- 2 pCi/L or less
Homeowners should be advised to have their mitigation contractors stipulate that they will
follow: - CORRECT ANSWER- Radon Mitigation Standards such as the US EPA, AARST,
ASTM, or as recognized by their state radon office
Prolonged exposure to radon is considered dangerous because radon can cause: - CORRECT
ANSWER- lung cancer
The most common radon mitigation technique at this time is: - CORRECT ANSWER- Active
soil depressurization
The Radon Action Level in the United States is: - CORRECT ANSWER- 4.0 pico Curies per
liter of air
The submembrane mitigation strategy is applicable to which of the following foundation
types? - CORRECT ANSWER- Crawl space houses
What is radon? - CORRECT ANSWER- An invisible, odorless, tasteless, naturally occurring,
radioactive gas.
What is the minimum deployment/sampling period for a short-term test? - CORRECT
ANSWER- Two days
What is the purpose of the US EPA Map of Radon Zones? - CORRECT ANSWER- To
suggest where radon resistant new construction techniques would be the most cost-effectively
employed.
Which of the following best represents the recommendation of the U.S. EPA for citizen
exposure to radon? - CORRECT ANSWER- Long-term exposure to elevated radon can
increase the potential for lung cancer
,Which of the following is an acceptable location for the discharge of an active soil
depressurization system? - CORRECT ANSWER- Above the eave of the roof.
Which of the following locations is appropriate for the fan of an active soil depressurization
system? - CORRECT ANSWER- Attic
Which of the following Radon measurement approaches best estimates occupant exposure? -
CORRECT ANSWER- A yearlong test with an alpha track detector in the lowest occupied
level of the home with no special precautions for closed building conditions.
A correct statement regarding radon testing in Zone 3 areas of the EPA Radon Potential Map
is that such testing: - CORRECT ANSWER- is recommended.
A significant difference between one room and the next in a building with a large central air
handling system is often caused by: - CORRECT ANSWER- An unbalanced air distribution
system
After 25 years of updates by testers and state agencies, the US EPA Map of Radon Zones is a
good predictor of where indoor radon levels will not be elevated. - CORRECT ANSWER-
False
How can you tell if a house contains elevated levels of radon? - CORRECT ANSWER- Test
for radon.
If a short-term, closed building radon test is conducted in the basement of a home with a
result of 10 pCi/L, what can be said about the radon levels on the first floor above the
basement? - CORRECT ANSWER- The first floor radon level is likely to be equal to or less
than the basement measurement of 10
If the water for a home comes from an underground well that has 60,000 pCi/L in the water,
how much radon will be added to the air of the home due to normal usage of water? -
CORRECT ANSWER- 6 to 10 pCi/L
In a cold climate, stack effect is typically higher during the: - CORRECT ANSWER- Winter
, In a house with a forced air heating and cooling system, which of the following conditions
would most likely increase short-term indoor radon concentrations the most? - CORRECT
ANSWER- Return ducts under the slab with the air blower on.
In most homes the main source of elevated radon levels is: - CORRECT ANSWER- the soil.
Indoor Radon levels are always higher during the winter months (November through March)
than any other time of year. - CORRECT ANSWER- False
On a nationwide basis, which of the following radon entry mechanisms account for the
greatest amount of radon entry? - CORRECT ANSWER- Convective movement of soil gas
into the building.
On an overall basis for similarly constructed homes in the same climatic area, under which of
the following conditions might one expect the highest radon entry into a home? - CORRECT
ANSWER- Highly permeable soil with high radium content beneath the house which is
entirely built over a crawl space.
Pipe chases up through interiors of apartment buildings can provide radon pathways to upper
level units. - CORRECT ANSWER- True
Temperature induced stack effect is greatest when: - CORRECT ANSWER- The outdoor
temperatures are very low relative to interior temperatures
The primary reason indoor radon levels are generally higher in basements is the fact that: -
CORRECT ANSWER- the basement is closest to the radon source.
The radon concentration of a private well for a home was determined to be 15,000 pCi/L of
water. Which of the following is the most appropriate recommendation? - CORRECT
ANSWER- Before proceeding to reducing the radon in the water, a radon-in-air test should
be conducted.
The water supply to a home has been determined to be 9,500 pCi per liter of water. A radon in
air test was also conducted while it was occupied with a result of 22 pCi/L of radon in the air.
What is the predominant source of radon? - CORRECT ANSWER- From the soil
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