NRPP Radon Measurements UPDATED
ACTUAL Questions and CORRECT
Answers
If a sample of radon is taken from a room that is known to be at 125pCi/L and is kept in a
well sealed container, what will the approximate radon activity be within the container after
eight days? - CORRECT ANSWER- 31.3
Radon decay products have (or )longer shorter half lives than radon gas? - CORRECT
ANSWER- Shorter
The ionization of an otherwise electrically neutral atom is used in measuring radiation. Which
process best describes ionization? - CORRECT ANSWER- An uncharged atom gains or loses
orbital electrons ()and becomes electrically charged.
Give three characteristics of radon - CORRECT ANSWER- Half life of 3.8 days
Inert
Can't sense (see, smell, or taste)
Radioactive
Naturally occurring
Gas
If a room within a home is determined to be at 25 pCi/L, what working level would be
expected in this room using typical assumptions for equilibrium ratio in residential buildings?
- CORRECT ANSWER- 0.13
What is the highest working level that could be observed in a room having a constant radon
activity of 10 pCi/L ? - CORRECT ANSWER- 0.1
f a radon measurement is calculated to be 7.8456 pCi/L, what number should be written on
the report to the client? - CORRECT ANSWER- 7.8 pCi/L
, A building has very high internal air circulation rate and was measured at 0.03WL. What can
be said about the radon concentrations? - CORRECT ANSWER- The radon is probably more
than 6 pCi/L.
What is the approximate outdoor radon concentration? - CORRECT ANSWER- 0.4 pCi/L
Within the U.S, the EPA believes the average annual indoor radon activity to be: - CORRECT
ANSWER- 1.3 pCi/L
What would be the expected working levels in a room at 4 pCi/L, using typical assumptions
for equilibrium ratio in residential buildings? - CORRECT ANSWER- 0.02 WL
In order to calculate the equilibrium ratio in a home you need to know: - CORRECT
ANSWER- Results of simultaneous measurements of radon and radon decay products.
Lung cancer risks exist with exposures to radon concentrations below 4pCi/L. - CORRECT
ANSWER- True
Short-term measurements can be factored by the time of deployment to determine a year-long
average. - CORRECT ANSWER- False
The results of a short-term, closed building test indicates the highest the radon could ever be.
- CORRECT ANSWER- False
Radon is only a concern in homes, not in schools and workplaces. - CORRECT ANSWER-
False
When emitted within the lungs, which one of the three ionizing radiation types causes the
most cell damage within the lung? - CORRECT ANSWER- alpha particle
The health risk of radon has most strongly been determined by what studies? - CORRECT
ANSWER- Occupational exposures and lung cancer incidence in underground miners Miner
Studies
ACTUAL Questions and CORRECT
Answers
If a sample of radon is taken from a room that is known to be at 125pCi/L and is kept in a
well sealed container, what will the approximate radon activity be within the container after
eight days? - CORRECT ANSWER- 31.3
Radon decay products have (or )longer shorter half lives than radon gas? - CORRECT
ANSWER- Shorter
The ionization of an otherwise electrically neutral atom is used in measuring radiation. Which
process best describes ionization? - CORRECT ANSWER- An uncharged atom gains or loses
orbital electrons ()and becomes electrically charged.
Give three characteristics of radon - CORRECT ANSWER- Half life of 3.8 days
Inert
Can't sense (see, smell, or taste)
Radioactive
Naturally occurring
Gas
If a room within a home is determined to be at 25 pCi/L, what working level would be
expected in this room using typical assumptions for equilibrium ratio in residential buildings?
- CORRECT ANSWER- 0.13
What is the highest working level that could be observed in a room having a constant radon
activity of 10 pCi/L ? - CORRECT ANSWER- 0.1
f a radon measurement is calculated to be 7.8456 pCi/L, what number should be written on
the report to the client? - CORRECT ANSWER- 7.8 pCi/L
, A building has very high internal air circulation rate and was measured at 0.03WL. What can
be said about the radon concentrations? - CORRECT ANSWER- The radon is probably more
than 6 pCi/L.
What is the approximate outdoor radon concentration? - CORRECT ANSWER- 0.4 pCi/L
Within the U.S, the EPA believes the average annual indoor radon activity to be: - CORRECT
ANSWER- 1.3 pCi/L
What would be the expected working levels in a room at 4 pCi/L, using typical assumptions
for equilibrium ratio in residential buildings? - CORRECT ANSWER- 0.02 WL
In order to calculate the equilibrium ratio in a home you need to know: - CORRECT
ANSWER- Results of simultaneous measurements of radon and radon decay products.
Lung cancer risks exist with exposures to radon concentrations below 4pCi/L. - CORRECT
ANSWER- True
Short-term measurements can be factored by the time of deployment to determine a year-long
average. - CORRECT ANSWER- False
The results of a short-term, closed building test indicates the highest the radon could ever be.
- CORRECT ANSWER- False
Radon is only a concern in homes, not in schools and workplaces. - CORRECT ANSWER-
False
When emitted within the lungs, which one of the three ionizing radiation types causes the
most cell damage within the lung? - CORRECT ANSWER- alpha particle
The health risk of radon has most strongly been determined by what studies? - CORRECT
ANSWER- Occupational exposures and lung cancer incidence in underground miners Miner
Studies
