Radon Entry and Behavior
1.
Cleaning the air the an electronic air cleaner will:
change the equilibrium ratio.
reduce the radon gas levels.
lower both radon decay progeny and gas levels.
ensure good mixing of the air and reduce radon gas levels moderately.
2.
The main factor influencing most soil-gas entry is:
the house being at a higher pressure than the soil under it.
the house being at a lower pressure than the soil under it
adjacent home with elevated radon levels.
adjacent homes without elevated radon levels.
3.
Of the following groups of mechanical systems, which has the greatest potential for causing house pressurization?
Clothes dryers, basement air-handlers,kitchen-range fans.
Bathroom fans, dishwashers, room air cleaners.
Clothes dryers, kitchen-range fans, room air cleaners.
Bathroom fans, dishwashers, basement air-handlers.
4.
Which of the following would most likely permit the greatest entry of soil gas in a slab-on-grade house?
Fireplace foundation
Electrical outlets
Metal heating ducts under slab
diffusion through concrete slab
5.
Which equilibrium ratio (ER) is commonly assumed as an average level in most houses?
0.1
0.3
0.6
0,5
6.
Generally, in a house with elevated radon levels (4pCi/L or above) most of the radon entry results from:
pressure-driven transport of soil gas through entry routes.
contaminated building materials.
radon in water.
diffusion through foundation.
7.
Which of the following is not a requirement for radon entry into buildings?
a driving force to power movement along pathways.
a nearby source.
central air heating and cooling system.
entry points into the building.
8.
Which of the following is not a potential radon source?
private well water.
natural soils and rock near or beneath the building.
Bottled drinking water.
contaminated building materials.
9.
The upward movement of air inside a building is called:
stack effect
thermal bypass
thermal resistance
neutral pressure plane
10.
Any opening within a building that facilitate the upward movement of house air is called:
thermal resistance
stack effect
thermal bypass
warm air supply