Radon Certification Exam Actual Questions and Answers
with complete solution
Radon Gas Characteristics
-not detected by human senses
-naturally occurring
-chemically unreactive
The nucleus of an atom consists of ____________ and ______________
protons and neutrons
What characteristic of an atom determines the charge?
Electrons
What characteristic of an atom determines the isotope?
Nuetrons
What characteristic of an atom determines the element I.D?
Protons
What determines the atomic mass number?
The number of protons AND neutrons
What is the annual average indoor radon level in the U.S?
1.3
What is the annual average outdoor radon level in the U.S?
0.4
What is the definition of a half-life?
The time required for HALF of the material to decay
______________ is an atom that has lost or gained electrons
Ion
1 picocurie per liter of radon is defined as
2.22 disintegrations per minute within one liter of air
How long does it take for radon gas to reach secular equilibrium?
4 hours
Higher air flow makes ER ________________
Decrease
Lower air flow makes ER _________________
Increase
[Working Level(100)]/(pCi/L)
Equilibrium Ratio Equation
Radon decay products primarily responsible for damage to lung cells
Polonium 218 and Polonium 214
______________ is a measure of exposure to radon decay products
Working Level Month
The largest single contributor to a persons total exposure to all forms of radiation
will come from:
Radon gas
A person who smokes is _____ times more likely to contract lung cancer from
radon
15
, 4 factors that influence the strength of the Radon source in the soil
1. Radium content of the soil
2. Size of the soil particles
3. Permeability of the soil
4. Forces pushing and pulling through the soil
4 driving forces responsible for Radon entry
1. Air pressure differentials
2. Diffusion
3. Emanation
4. Well Water
Which driving force is responsible for the greatest amount of radon entry?
Air pressure differentials
What driving force is associated with the stack effect?
Temperature differences
What driving force is associated with diffusion?
Concentration differences
Radon and Radon decay product measurements that are permitted to be used for
real estate testing and yield a single average reading over a period of time.
Time Integrated Measurements
Radon and Radon decay product measurements that are taken over a few
seconds or minutes and are allowed to reach secular equilibrium and are counted
for at least 10 minutes.
Grab Measurements
Radon and Radon decay product measurements that show the average radon
concentration and hourly trends.
Continuous measurements
Radon and Radon decay products that are taken over a few seconds or minutes
and are immediately counted.
Sniffing measurements
How long should closed house conditions be maintained prior to a short-term
test lasting less than 4 days?
12 hours prior to initial testing
For s short-term test lasting less than 7 days how long should closed house
conditions be maintained?
They do not need to be maintained prior to initiating testing.
What is the minimum distance a radon detector should be placed from the floor?
20 inches or almost 2 feet
What is the minimum distance a radon detector should be placed from any object
other than the floor, exterior wall, or opening to outdoors?
4 inches
What is the minimum distance a radon detector should be placed from an outside
wall without an opening?
1 foot
What is the minimum distance a radon detector should be placed from an
opening to the outside?
3 feet
with complete solution
Radon Gas Characteristics
-not detected by human senses
-naturally occurring
-chemically unreactive
The nucleus of an atom consists of ____________ and ______________
protons and neutrons
What characteristic of an atom determines the charge?
Electrons
What characteristic of an atom determines the isotope?
Nuetrons
What characteristic of an atom determines the element I.D?
Protons
What determines the atomic mass number?
The number of protons AND neutrons
What is the annual average indoor radon level in the U.S?
1.3
What is the annual average outdoor radon level in the U.S?
0.4
What is the definition of a half-life?
The time required for HALF of the material to decay
______________ is an atom that has lost or gained electrons
Ion
1 picocurie per liter of radon is defined as
2.22 disintegrations per minute within one liter of air
How long does it take for radon gas to reach secular equilibrium?
4 hours
Higher air flow makes ER ________________
Decrease
Lower air flow makes ER _________________
Increase
[Working Level(100)]/(pCi/L)
Equilibrium Ratio Equation
Radon decay products primarily responsible for damage to lung cells
Polonium 218 and Polonium 214
______________ is a measure of exposure to radon decay products
Working Level Month
The largest single contributor to a persons total exposure to all forms of radiation
will come from:
Radon gas
A person who smokes is _____ times more likely to contract lung cancer from
radon
15
, 4 factors that influence the strength of the Radon source in the soil
1. Radium content of the soil
2. Size of the soil particles
3. Permeability of the soil
4. Forces pushing and pulling through the soil
4 driving forces responsible for Radon entry
1. Air pressure differentials
2. Diffusion
3. Emanation
4. Well Water
Which driving force is responsible for the greatest amount of radon entry?
Air pressure differentials
What driving force is associated with the stack effect?
Temperature differences
What driving force is associated with diffusion?
Concentration differences
Radon and Radon decay product measurements that are permitted to be used for
real estate testing and yield a single average reading over a period of time.
Time Integrated Measurements
Radon and Radon decay product measurements that are taken over a few
seconds or minutes and are allowed to reach secular equilibrium and are counted
for at least 10 minutes.
Grab Measurements
Radon and Radon decay product measurements that show the average radon
concentration and hourly trends.
Continuous measurements
Radon and Radon decay products that are taken over a few seconds or minutes
and are immediately counted.
Sniffing measurements
How long should closed house conditions be maintained prior to a short-term
test lasting less than 4 days?
12 hours prior to initial testing
For s short-term test lasting less than 7 days how long should closed house
conditions be maintained?
They do not need to be maintained prior to initiating testing.
What is the minimum distance a radon detector should be placed from the floor?
20 inches or almost 2 feet
What is the minimum distance a radon detector should be placed from any object
other than the floor, exterior wall, or opening to outdoors?
4 inches
What is the minimum distance a radon detector should be placed from an outside
wall without an opening?
1 foot
What is the minimum distance a radon detector should be placed from an
opening to the outside?
3 feet
