RADON CORE EXAM MANUAL UPDATED STUDY
QUESTIONS AND ANSWERS GRADED A+
If the Working Level concentration is 0.03 WL, using common assumptions of
equilibrium what is the Radon concentration in the room?
a. 0.5 pCi/L
b. 2.0 pCi/L
c. 4.0 pCi/L
d. 6.0 pCi/L - ✔✔d. 6.0 pCi/L
If the Working Level concentration is 0.06 and the Radon concentration is 10 pCi/L,
what is the equilibrium ratio?
a. 0.4
b. 0.6
c. 1.0
d. 4.0 - ✔✔b. 0.6
Which of the following is an incorrect statement?
a. Radon 222 is a radioactive gas.
b. Radon 222 is a product of radium.
c. Radon 222 is an inert gas.
d. Radon 222, once formed, disappears in 3.8 days. - ✔✔d. Radon 222, once formed,
disappeared in 3.8 days.
Which of the following is not necessarily a correct statement?
a. A measurement of 0.02 WL of RDP means 4 pCi/L of Radon exists in the room.
b. One picocurie is one trillionth of a curie.
c. One pCi/L is equal to 2.22 disintegrations in a liter of air in a minute.
d. WL is defined as the alpha energy released from RDP. - ✔✔a. A measurement of
0.02 WL of RDP means 4 pCi/L of Radon exists in the room.
Working Level is a measure of
a. a location of work within a uranium mine
b. a measure of the amount of radiation produced by the Radon Decay products.
c. a time dose measure of the exposure to radon decay products
d. a measure of the amount of radiation produced by radon gas. - ✔✔b. a measure of
the amount of radiation produced by the radon decay products.
100 pCi/L of radon is inside a radon proof container, if the container is remeasured in 11
days. Approximately how much radon is left left in the container?
,a. 13 pCi/L
b. 25pCi/L
c. 50pCi/L
d. 75 pCi/L - ✔✔a. 13 pCi/L
Which of the following radon progeny groups produce the alpha radiation representing
the greatest health concern associated with radon?
a. bismuth 214 lead 210
b. bismuth 214 lead 214
c. lead 210 lead 214
d. polonium 214 polonium 218 - ✔✔d. polonium 214 polonium 218
Which of the following types of radiation deliver the most amount of energy per single
impact to living tissue?
a. alpha radiation
b. beta radiation
c. gamma radiation
d. lead 210 deposition - ✔✔a. alpha radiation
An alpha particle is composed of
a. 1 proton 1 electron
b. 1 proton 1 neutron
c. 2 protons 2 electrons
d. 2 protons 2 neutrons - ✔✔d. 2 protons 2 neutrons
An equilibrium ratio of .5 is typically used when converting from WL measurements to
pCi/L what does this mean?
a. of the radon decay products produced from the radon in the room 25% are attached
to the walls and the other 25% are attached to suspended particles in the room.
b. of the radon decay products that were produced from the radon in the room only half
are measurable.
c. only 50% of the alpha energy of radon is being detached by the WL measurement
device.
d. radon decay product measurements have a fixed or set bias of 50%. - ✔✔b. b. of the
radon decay products that were produced from the radon in the room only half are
measurable.
A measurement of .5 WL is made in a home. Using typical equilibrium ratio
assumptions, what is the radon concentration?
a. 5 pCi/L
b. 50pCi/L
, c. 100 pCi/L
d. 200 pCi/L - ✔✔c. 100 pCi/L
Two simultaneous measurements for radon and radon decay products were made in a
room. The radon was 4.0 pCi/L and the WL is 0.01 what is the equilibrium ratio?
a. 0.02
b. 0.25
c. 0.50
d. 400 - ✔✔b. 0.25
A measurement of 12 pCi/L is made in a home. Using typical equilibrium ratio
assumptions what is the WL?
a. 0.03 WL
b. 0.06 WL
c. 0.12 WL
d. 0.24 WL - ✔✔b. 0.06 WL
Which of the following would likely cause the equilibrium ratio to decrease?
a. Higher air circulation in the room
b. Higher indoor temp
c. Lower air circulation in the room
d. Lower indoor temp - ✔✔a. Higher air circulation in the room
The types of radiation in order of increasing penetration power from least penetrating to
most penetrating are?
a. alpha beta gamma
b. alpha gamma beta
c. beta alpha gamma
d. gamma beta alpha - ✔✔a. alpha beta gamma
Which of the following is a property of Radon decay products?
a. they are a gas
b. they are long lived
c. they are non chemically reactive
d. they have a static charge - ✔✔d. They have a static charge
Two pico Curies per liter is equal to?
a. 27 Becquerels
b. 37 becquerels
c. 54 becquerels
QUESTIONS AND ANSWERS GRADED A+
If the Working Level concentration is 0.03 WL, using common assumptions of
equilibrium what is the Radon concentration in the room?
a. 0.5 pCi/L
b. 2.0 pCi/L
c. 4.0 pCi/L
d. 6.0 pCi/L - ✔✔d. 6.0 pCi/L
If the Working Level concentration is 0.06 and the Radon concentration is 10 pCi/L,
what is the equilibrium ratio?
a. 0.4
b. 0.6
c. 1.0
d. 4.0 - ✔✔b. 0.6
Which of the following is an incorrect statement?
a. Radon 222 is a radioactive gas.
b. Radon 222 is a product of radium.
c. Radon 222 is an inert gas.
d. Radon 222, once formed, disappears in 3.8 days. - ✔✔d. Radon 222, once formed,
disappeared in 3.8 days.
Which of the following is not necessarily a correct statement?
a. A measurement of 0.02 WL of RDP means 4 pCi/L of Radon exists in the room.
b. One picocurie is one trillionth of a curie.
c. One pCi/L is equal to 2.22 disintegrations in a liter of air in a minute.
d. WL is defined as the alpha energy released from RDP. - ✔✔a. A measurement of
0.02 WL of RDP means 4 pCi/L of Radon exists in the room.
Working Level is a measure of
a. a location of work within a uranium mine
b. a measure of the amount of radiation produced by the Radon Decay products.
c. a time dose measure of the exposure to radon decay products
d. a measure of the amount of radiation produced by radon gas. - ✔✔b. a measure of
the amount of radiation produced by the radon decay products.
100 pCi/L of radon is inside a radon proof container, if the container is remeasured in 11
days. Approximately how much radon is left left in the container?
,a. 13 pCi/L
b. 25pCi/L
c. 50pCi/L
d. 75 pCi/L - ✔✔a. 13 pCi/L
Which of the following radon progeny groups produce the alpha radiation representing
the greatest health concern associated with radon?
a. bismuth 214 lead 210
b. bismuth 214 lead 214
c. lead 210 lead 214
d. polonium 214 polonium 218 - ✔✔d. polonium 214 polonium 218
Which of the following types of radiation deliver the most amount of energy per single
impact to living tissue?
a. alpha radiation
b. beta radiation
c. gamma radiation
d. lead 210 deposition - ✔✔a. alpha radiation
An alpha particle is composed of
a. 1 proton 1 electron
b. 1 proton 1 neutron
c. 2 protons 2 electrons
d. 2 protons 2 neutrons - ✔✔d. 2 protons 2 neutrons
An equilibrium ratio of .5 is typically used when converting from WL measurements to
pCi/L what does this mean?
a. of the radon decay products produced from the radon in the room 25% are attached
to the walls and the other 25% are attached to suspended particles in the room.
b. of the radon decay products that were produced from the radon in the room only half
are measurable.
c. only 50% of the alpha energy of radon is being detached by the WL measurement
device.
d. radon decay product measurements have a fixed or set bias of 50%. - ✔✔b. b. of the
radon decay products that were produced from the radon in the room only half are
measurable.
A measurement of .5 WL is made in a home. Using typical equilibrium ratio
assumptions, what is the radon concentration?
a. 5 pCi/L
b. 50pCi/L
, c. 100 pCi/L
d. 200 pCi/L - ✔✔c. 100 pCi/L
Two simultaneous measurements for radon and radon decay products were made in a
room. The radon was 4.0 pCi/L and the WL is 0.01 what is the equilibrium ratio?
a. 0.02
b. 0.25
c. 0.50
d. 400 - ✔✔b. 0.25
A measurement of 12 pCi/L is made in a home. Using typical equilibrium ratio
assumptions what is the WL?
a. 0.03 WL
b. 0.06 WL
c. 0.12 WL
d. 0.24 WL - ✔✔b. 0.06 WL
Which of the following would likely cause the equilibrium ratio to decrease?
a. Higher air circulation in the room
b. Higher indoor temp
c. Lower air circulation in the room
d. Lower indoor temp - ✔✔a. Higher air circulation in the room
The types of radiation in order of increasing penetration power from least penetrating to
most penetrating are?
a. alpha beta gamma
b. alpha gamma beta
c. beta alpha gamma
d. gamma beta alpha - ✔✔a. alpha beta gamma
Which of the following is a property of Radon decay products?
a. they are a gas
b. they are long lived
c. they are non chemically reactive
d. they have a static charge - ✔✔d. They have a static charge
Two pico Curies per liter is equal to?
a. 27 Becquerels
b. 37 becquerels
c. 54 becquerels
