RADON TEST SPRUCE EXAM PREP 2026 FULL
QUESTIONS AND ANSWERS GRADED A+
◉ What is the risk of smokers and non-smokers getting lung cancer
from Radon? Answer: 62/1000 smokers
7/1000 non smokers
◉ What determines the risk of getting lung cancer from Radon? Answer:
Concentration of Radon and RDPs and Length of Exposure
◉ Hoe does Radon enter the home? Answer: Radon gas moves through
the ground due to air pressure differentials in the home, and up into the
home through cracks or other openings in the foundation. Can also enter
through well water and some building materials.
◉ How is radon formed? Answer: Decay of Uranium-238 into Radium-
226 with the release of alpha particles, followed by the decay of
Radium-226 into Rn-222 with the release of alpha particles
◉ How do we know about the effects of Radon? Answer:
Epidemiological studies were completed on lung cancers in workers,
especially miners.
,◉ What are the 4 RDPs that Radon decays into? Answer: Polonium-218
Lead-214
Bismuth-214
Polonium-214
◉ What is the most common form of a radon mitigation system?
Answer: Active Soil Depressurization (ASD)
◉ True or False - Radon levels are the same in each house. Answer:
False
◉ Why are radon concentrations higher in the winter? Answer: Houses
are in closed conditions, which increases Radon concentrations
◉ Which RDP(s) damage the lungs? Answer: Polonium-214 and
Polonium-218
◉ True or False - There are no health risks if Radon concentrations are
below 4 pCi/L. Answer: False
◉ What is the OSHA Occupational Radon Exposure Level for adults in
a 40 hour work week? Answer: 100 pCi/L or 12 WLM/Year RDP
cumulative exposure for 1 working year
, ◉ What are the requirements before conducting a short-term radon test?
Answer: 1. Closed building conditions for at least 12 hours prior
2. Indoor temperature must be 65-80°F
*Requirements and testing protocol must be told to homeowner prior to
starting the test when possible
*May want a non-interference agreement with homeowner
*Request posting "Radon Test in Progress"
◉ How long can a short-term radon test be deployed? Answer: 46 hours-
90 days, optimal time is 48 hours
◉ What is the purpose of a short-term radon test? Answer: Quickly
identify a potential radon hazard
◉ What is simultaneous short-term testing? Answer: Running two tests
at the same time, average the results to determine if mitigation is
required
◉ What is sequential short-term testing? Answer: 1. Conduct a single
short-term radon test
- If 4 pCi/L or higher, retest right away using a short term test and then
average both results to make a mitigation decision.
QUESTIONS AND ANSWERS GRADED A+
◉ What is the risk of smokers and non-smokers getting lung cancer
from Radon? Answer: 62/1000 smokers
7/1000 non smokers
◉ What determines the risk of getting lung cancer from Radon? Answer:
Concentration of Radon and RDPs and Length of Exposure
◉ Hoe does Radon enter the home? Answer: Radon gas moves through
the ground due to air pressure differentials in the home, and up into the
home through cracks or other openings in the foundation. Can also enter
through well water and some building materials.
◉ How is radon formed? Answer: Decay of Uranium-238 into Radium-
226 with the release of alpha particles, followed by the decay of
Radium-226 into Rn-222 with the release of alpha particles
◉ How do we know about the effects of Radon? Answer:
Epidemiological studies were completed on lung cancers in workers,
especially miners.
,◉ What are the 4 RDPs that Radon decays into? Answer: Polonium-218
Lead-214
Bismuth-214
Polonium-214
◉ What is the most common form of a radon mitigation system?
Answer: Active Soil Depressurization (ASD)
◉ True or False - Radon levels are the same in each house. Answer:
False
◉ Why are radon concentrations higher in the winter? Answer: Houses
are in closed conditions, which increases Radon concentrations
◉ Which RDP(s) damage the lungs? Answer: Polonium-214 and
Polonium-218
◉ True or False - There are no health risks if Radon concentrations are
below 4 pCi/L. Answer: False
◉ What is the OSHA Occupational Radon Exposure Level for adults in
a 40 hour work week? Answer: 100 pCi/L or 12 WLM/Year RDP
cumulative exposure for 1 working year
, ◉ What are the requirements before conducting a short-term radon test?
Answer: 1. Closed building conditions for at least 12 hours prior
2. Indoor temperature must be 65-80°F
*Requirements and testing protocol must be told to homeowner prior to
starting the test when possible
*May want a non-interference agreement with homeowner
*Request posting "Radon Test in Progress"
◉ How long can a short-term radon test be deployed? Answer: 46 hours-
90 days, optimal time is 48 hours
◉ What is the purpose of a short-term radon test? Answer: Quickly
identify a potential radon hazard
◉ What is simultaneous short-term testing? Answer: Running two tests
at the same time, average the results to determine if mitigation is
required
◉ What is sequential short-term testing? Answer: 1. Conduct a single
short-term radon test
- If 4 pCi/L or higher, retest right away using a short term test and then
average both results to make a mitigation decision.
