New Jersey Radon Technician Review Questions

(d) is not detected by human senses, is naturally occurring, does not chemically react

Which of the following are characteristics of radon?

(a) has no static charge, solid particle, does not react chemically

(b) is a gas, radioactive, can be detected by human senses

(c) is man-made, does not chemically react, is a gas

(d) is not detected by human senses, is naturally occurring, does not chemically react

(c) protons and neutrons

The nucleus of an atom consists of:

(a) electrons and protons

(b) neutrons and electrons

(c) protons and neutrons

(d) protons, neutrons and electrons

(c) the number of protons

The characteristic of an atom that determines which element it is is:

(a) the number of electrons

(b) the number of neutrons

(c) the number of protons

(d) the number of protons and neutrons

(a) 0.4 pCi/L outdoors and 1.3 pCi/L indoors

The annual average U.S. outdoor and indoor radon levels are:

(a) 0.4 pCi/L outdoors and 1.3 pCi/L indoors

(b) 0.5 pCi/L outdoors and 4.0 pCi/L indoors

(c) 0.6 pCi/L outdoors and 4.0 pCi/L indoors

(d) 0.7 pCi/L outdoors and 1.3 pCi/L indoors

(c) has lost or gained electrons

An ion is an atom that:

(a) cannot accept additional electrons

(b) cannot eliminate additional electrons

(c) has lost or gained electrons

(d) has no electrons

(c) 2.22 disintegrations per minute within a liter of air

One picoCurie per liter of radon is defined as:

(a) one billionth of a Curie

(b) 2.22 disintegrations per minute per gram of air

(c) 2.22 disintegrations per minute within a liter of air

(d) 37 billion disintegrations per second

(a) 4 hours

It takes _____ hours for radon to reach secular equilibrium with its short-lived decay products.

(a) 4 hours

(b) 12 hours

(c) 24 hours

(d) 48 hours

(b) 0.034 WL

If the radon concentration is 8 pCi/L what is the Working Level of radon decay products using common assumptions of equilibrium ER = 0.4?

(a) 0.024 WL

(b) 0.034 WL

(c) 0.040 WL

(d) 0.048 WL

(b) 7.5 pCi/L

If the Working Level concentration is 0.03 WL, using common assumptions of equilibrium (ER = 0.4), what is the radon concentration in the room?

(a) 10.0 pCi/L

(b) 7.5 pCi/L

(c) 6.0 pCi/L

(d) 5.0 pCi/L

(b) 0.6

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

(d) Radon 222 once formed, disappears in 3.8 days

Which of the following is an INCORRECT statement?

(a) Radon 222 is a radioactive gas

(b) Radon 222 is day product of radium

(c) Radon 222 is an inert gas

(d) Radon 222 once formed, disappears in 3.8 days

(a) a measurement of 0.016 WL of radon decay products means 4 pCi/L of radon exists in the room

Which of the following is NOT necessarily a correct statement?

(a) a measurement of 0.016 WL of radon decay products 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 2.2 disintegration's in a liter of air in a minute

(d) WL is defined as the alpha energy released from radon decay products

(b) a measure of the amount of radiation produced by the radon decay products

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

(a) 13 pCi/L

One-hundred (100) pCi/L of radon is inside a radon proof container. If the container is re-measured in 11 1/2 days later, approximately how much radon is left in the counter?

(a) 13 pCi/L

(b) 25 pCi/L

(c) 50 pCi/L

(d) 75 pCi/L

(d) Polonium 214 and Polonium 218

Which of the following radon progeny groups produce the alpha radiation representing the greatest health concern associated with radon?

(a) Bismuth 214 and Lead 210

(b) Bismuth 214 and Lead 214

(c) Lead 210 and Lead 214

(d) Polonium 214 and Polonium 218

(a) alpha radiation

Which of the following types of radiation delivers the most amount of energy per single impact to living tissue?

(a) alpha radiation

(b) beta radiation

(c) gamma radiation

(d) lead 210 deposition

(d) 2 protons and 2 neutrons

An alpha particle is composed of:

(a) 1 proton and 1 electron

(b) 1 proton and 1 neutron

(c) 2 protons and 2 electrons

(d) 2 protons and 2 neutrons

(b) of the radon decay products that were produced from the radon in the room, only 40% are measurable

An equilibrium ratio of 0.4 is typically used when converting from working level measurements to pCi/L. What does that mean?

(a) of the radon decay products produced from the radon in the room, 20% are attached to the walls and another 20% are attached to suspended particulates in the room

(b) of the radon decay products that were produced from the radon in the room, only 40% are measurable

(c) only 40% of the alpha energy of radon is being detected by the working level measurement device

(d) radon decay product measurements have a fixed or set bias of 40%

(b) 125.0 pCi/L

A measurement of 0.5 WL is made in a home. Using typical equilibrium ratio assumptions (ER = 0.4), what is the radon concentration?

(a) 83.3 pCi/L

(b) 125.0 pCi/L

(c) 100.0 pCi/L

(d) 166.7 pCi/L

(b) 0.25

Two simultaneous measurements for radon and radon decay products were made in a room. The radon was 4.0 pCi/L and the working level was 0.01 WL. What is the equilibrium ratio

(a) 0.02

(b) 0.25

(c) 0.50

(d) 400

(c) 0.048 WL

A measurement of 12.0 pCi/L is made in a home. Using typical equilibrium ratio assumptions (ER = 0.4), what is the Working Level?

(a) 0.072 WL

(b) 0.060 WL

(c) 0.048 WL

(d) 0.036 WL

(a) higher air circulation in the room

Which of the following would likely cause the equilibrium ratio to decrease?

(a) higher air circulation in the room

(b) higher indoor temperature

(c) lower air circulation in the room

(d) lower indoor temperature

(a) alpha followed by beta, then gamma

The types of radiation in order of increasing penetrating power, from least penetrating to most penetrating are:

(a) alpha followed by beta, then gamma

(b) alpha followed by gamma, then beta

(c) beta followed by alpha, then gamma

(d) gamma followed by beta, then alpha

(d) they have a static charge

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) 74 Becquerels

Two picoCuries per liter is equal to:

(a) 27 Becquerels

(b) 37 Becquerels

(c) 54 Becquerels

(d) 74 Becquerels

(c) secular equilibrium

If radon and radon decay products have reached the same decay rate, they are said to have achieved:

(a) dynamic equilibrium

(b) equilibrium ratio

(c) secular equilibrium

(d) transient equilibrium

(d) tobacco smoking

Which of the following represents the single greatest factor for increasing the risk of lung cancer?

(a) environmental tobacco smoke

(b) radon

(c) radon decay products

(d) tobacco smoking

(b) 8-9 times

The health risk from radon for smokers is how much greater than that of never-smokers?

(a) 2 times

(b) 8-9 times

(c) 15 times

(d) 29 times

(b) 7

How many additional lung cancers does the EPA predict would happen if 1000 never-smokers were exposed to 4 pCi/L of radon in the home?

(a) 2

(b) 7

(c) 29

(d) 62

(d) 62

How many additional lung cancers does the EPA predict would happen if 1000 smokers were exposed to 4 pCi/L of radon in the home?

(a) 2

(b) 7

(c) 29

(d) 62

(c) case control studies

BONUS QUESTION: The best method for determining the health effects of radon is through evaluation of:

(a) animal studies

(b) ecological studies

(c) case control studies

(d) cohort studies

(c) 43.3 WLM

BONUS QUESTION: If a person is exposed to 4 pCi/L for 18 hours per day for 70 years, what will their total exposure be in WLM (ER = 0.4)?

(a) 65.0 WLM

(b) 51.1 WLM

(c) 43.3 WLM

(d) 32.5 WLM

(c) Polonium 218 and Polonium 214

The radon decay products primarily responsible for the damage to lung cells are:

(a) Polonium 214 and Bismuth 214

(b) Polonium 214 and Lead 214

(c) Polonium 218 and Polonium 214

(d) Polonium 218 and Radon 222

(b) damage the DNA

Alpha particles cause lung cancer primarily because they chemically and physically:

(a) alter cell function

(b) damage the DNA

(c) kill cells

(d) penetrate the outside of lungs

(a) and exposure to the (alpha) energy released by radon decay products

MEASUREMENT ONLY BONUS QUESTION: Working level month is a measure of the dose:

(a) and exposure to the (alpha) energy released by radon decay products

(b) and exposure to the (alpha) energy released by radon gas

(c) from the alpha energy released by radon decay products

(d) from the alpha energy released by radon gas

(c) radon gas

For the average person, the second largest single contribution to their total exposure to all forms of radiation will come from:

(a) cosmis radiation

(b) medical x-rays

(c) radon gas

(d) terrestrial radiation

(d) Working Level Month

Risk of contracting lung cancer is most closely linked to which of the following:

(a) picoCuries per liter

(b) secular equilibrium

(c) Working Level

(d) Working Level Month

(b) 8-9 times greater for a smoker than a never smoker

The risk of contracting lung cancer is about:

(a) 8-9 times greater for a never smoker than a smoker

(b) 8-9 times greater for a smoker than a never smoker

(c) 15 times greater for a never smoker than a never smoker

(d) 15 times great for a smoker than a smoker

(d) smoking a pack of cigarettes per day

Which carries the greatest risk of premature death?

(a) being exposed to 4.0 pCi/L of radon per day

(b) flying on commercial airlines

(c) residential fire

(d) smoking a pack of cigarettes per day

(b) radon decay products and the length of exposure

Which carries the greatest risk of premature death? Amount of:

(a) radon decay products and the equilibrium ration

(b) radon decay products and the length of exposure

(c) radon gas and the equilibrium ratio

(d) radon gas and the length of exposure

(c) 0.0059 WLM

BONUS QUESTION FOR MITIGATORS: If a mitigator works on a house with a radon concentration of 40 pCi/L, working 5 hours indoors during the job, what will the WLM exposure be for the job (ER = 0.5)?

(a) 10.0 WLM

(b) 0.8 WLM

(c) 0.0059 WLM

(d) 0.0026 WLM

(d) radon source strength

Which of the following factors influencing houses indoor radon concentrations is the most important determinant of indoor concentrations?

(a) driving forces

(b) house ventilation rate

(c) pathways from the soil to the indoors

(d) radon source strength

(d) infiltration of soil gas into the building

On a nationwide basis, which of the following radon entry driving forces or mechanisms account for the greatest amount of radon entry into a building?

(a) aeration of well water used in the building

(b) diffusion of radon through the foundation and concrete floor

(c) emanation from building materials within the building

(d) infiltration of soil gas into the building

(a) air pressure differences, environmental effects, and ventilation

EPA measurement protocols attempt to control and standardize which of the following factors?

(a) air pressure differences, environmental effects, and ventilation

(b) pathways, diffusion driving forces, and environmental effects

(c) radon source strength, environmental effects, and ventilation

(d) radon source strength, pathways, and diffusion driving forces

(a) air pressure differences

Most commonly, radon mitigation focuses on which of the following driving forces?

(a) air pressure differences

(b) diffusion

(c) emanation

(d) well water

(b) heavy rain

What weather condition typically causes the indoor basement radon concentration to suddenly increase the most?

(a) freezing weather

(b) heavy rain

(c) increasing barometric pressure

(d) light wind

(c) with a cracked basement floor slab on highly permeable soil with a moderate radium content

Which of the following homes would you expect to have the highest indoor radon levels? A home:

(a) which has 30,000 pCi/L in the water

(b) with a crack-free basement floor slab on clay soil with very high radium content

(c) with a cracked basement floor slab on highly permeable soil with a moderate radium content

(d) with a vented crawl space with clay soil which has a moderate radium content

(c) temperature differences

Which produces the driving force referred to as stack effect?

(a) concentration differences

(b) precipitation differences

(c) temperature differences

(d) wind pressure differences

(c) the number of protons

The characteristic of an atom which determines the element it is is:

(a) the number of electrons

(b) the number of neutrons

(c) the number of protons

(d) the number of protons and neutrons

(b) dynamic equilibrium

The phenomenon responsible for the requirement for closing a house 12 hours prior to initiating a test in less than 4 days is:

(a) chemical equilibrium

(b) dynamic equilibrium

(c) secular equilibrium

(d) synaptic equilibrium

(a) floor drains cause the concrete to crack around the drain because it weakens the slab

MEASUREMENT ONLY BONUS QUESTION: A floor drain with water in its trap can be a radon entry point due to which of the following reasons?

(a) floor drains cause the concrete to crack around the drain because it weakens the slab

(b) radon can follow the loose fill around the pipe and enter around the edges of the drain

(c) soil gas containing radon can migrate up the pipe and easily diffuse through the water in the trap

(d) water draining through drain pipes cause negative indoor air pressure which sucks in radon

(b) return ducts under the slab with the air blower on

MEASUREMENT ONLY BONUS QUESTION: In a house with a forced air heating and cooling system, which of the following conditions would most likely increase indoor radon the most?

(a) return ducts under the slab with the air blower off

(b) return ducts under the slab with the air blower on

(c) supply ducts under the slab with the air blower off

(d) supply ducts under the slab with the air blower on

(a) 1/16" perimeter basement slab crack

MEASUREMENT ONLY BONUS QUESTION: Which of the following might you assume to be typically contributing the most amount of radon?

(a) 1/16" perimeter basement slab crack

(b) concrete clock basement walls

(c) exterior foundation drain discharged to day-light

(d) shower usage in a home with well water

(b) openings around a plumbing pipe passing into the attic

MEASUREMENT ONLY BONUS QUESTION: Which of the following is an unplanned thermal bypass in the thermal envelope?

(a) combustion exhaust fumes rising up a house chimney

(b) openings around a plumbing pipe passing into the attic

(c) openings between the basement and the first floor

(d) stand by heat loss from a water heater

(a) 0.004"

MEASUREMENT ONLY BONUS QUESTION: One Pascal is equal to how many inches of water column

(a) 0.004"

(b) 0.025"

(c) 0.250"

(d) 250.0"

(d) entry from the well water and soil gas

MEASUREMENT ONLY BONUS QUESTION: Simultaneous long-term radon tests were performed on all levels of a 2 story house with a full basement. The following results were reported: basement = 6.0 pCi/L; first floor = 5.0 pCi/L; and second floor master bedroom with an attached bath = 9 pCi/L. What radon entry routes are probably going to have to be addressed?

(a) emanation from the fieldstone walls and radon entry fro the soil gas

(b) entry from the soil gas

(c) entry from the well water

(d) entry from the well water and soil gas

(b) an activated charcoal detector

A passive radon measurement device that detects radon by analyzing the gamma radiation from radon decay products emitted by the radon captured in the device is:

(a) a liquid scintillation detector

(b) an activated charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(a) a charcoal liquid scintillation detector

A passive radon measurement device that detects radon by analyzing the alpha and beta radiation from a radon decay products emitted by the radon captured in the device is:

(a) a charcoal liquid scintillation detector

(b) an activated charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(c) an alpha track detector

A passive radon measurement device that determines radon based upon counting the marks left in plastic by alpha radiation coming from radon and radon decay products emitted by the radon captured in the device is:

(a) a liquid scintillation detector

(b) an activated charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(d) an electret ion chamber detector

A passive radon measurement device that detects radon by detecting the ions created by alpha, beta, and gamma radiation emitted by the radon captured in the device is:

(a) a liquid scintillation detector

(b) an activated charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(b) an open-faced charcoal detector

A passive radon measurement device with an optimal deployment period of two or three days and is not a true integrating device is:

(a) a charcoal liquid scintillation detector

(b) an open-faced charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(c) an alpha track detector

A passive radon measurement device that is NOT capable of accurately measuring low levels of radon over short periods of time is:

(a) a charcoal liquid scintillation detector

(b) an activated charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(d) an electret ion chamber detector

A passive radon measurement device that is adversely affected by background gamma radiation is:

(a) a charcoal liquid scintillation detector

(b) an activated charcoal detector

(c) an alpha track detector

(d) an electret ion chamber detector

(a) pulsed ion chamber

A continuous radon measurement device that measures radon by detecting the ions created by radiation from the radon in the device is a:

(a) pulsed ion chamber

(b) scintillation cell and a photomultiplier tube

(c) solid state silicon chip

(d) surface barrier detector

(b) scintillation disc and a photomultiplier tube

A continuous radon decay product measurement device that detects radon decay products by counting light flashes:

(a) pulsed ion chamber

(b) scintillation disc and a photomultiplier tube

(c) solid state silicon chip

(d) surface barrier detector

(d) surface barrier detector

Which of the following technology is used in continuous radon decay product monitor?

(a) pulsed ion chamber

(b) scintillation disc and a photomultiplier tube

(c) solid state silicon chip

(d) surface barrier detector

(d) they must be set out longer than diffusion barrier canisters

Which of the following statements is NOT true regarding open faced activated carbon canisters?

(a) their readings are biased towards the last 12 to 24 hours of exposure

(b) they are affected by drafts

(c) they are affected by humidity

(d) they must be set out longer than diffusion barrier canisters

(c) natural gamma radiation

Electret ion chamber devices are affected by which of the following?

(a) high humidity

(b) ionization in the test area

(c) natural gamma radiation

(d) radon decay products in the air

(d) gamma radiation from radon decay products in the carbon

When a laboratory analyzes a carbon canister, it is actually measuring:

(a) alpha radiation from radon in the carbon

(b) alpha radiation from radon decay products in the carbon

(c) gamma radiation from radon in the carbon

(d) gamma radiation from radon decay products in the carbon

(a) counting marks on a film or piece of plastic made by alpha particles

When a laboratory determines radon concentrations from an alpha track device, it is:

(a) counting marks on a film or piece of plastic made by alpha particles

(b) measuring the accumulative radioactivity of the device

(c) measuring the stored radon which has accumulated within the device

(d) measuring the weight gain of the device due to deposition of Lead 210

(d) electret ion chamber

An example of device classified as passive time integrating is:

(a) continuous pulsed ion chamber radon monitor

(b) continuous scintillation cell radon monitor

(c) continuous scintillation cell radon decay product monitor

(d) electret ion chamber

(c) 2 days to 1 year

Depending on their configuration, electret ion chambers can be deployed for periods anywhere from:

(a) 2 to 4 days

(b) 2 to 7 days

(c) 2 days to 1 year

(d) 3 months to 1 year

(a) electret ion chamber

Which of the following is NOT used to measure radon continuously?

(a) electret ion chamber

(b) scintillation cell

(c) pulse ion chamber

(d) solid state silicone surface detector

(b) quantifying the airflow across the filter

Which of the following is the most important factor when making a radon decay product measurement?

(a) calculating the amount of dust in the air

(b) quantifying the airflow across the filter

(c) using a filter coated with alpha attractant

(d) using a filter coated with RDP attractant

(a) alpha and beta particles striking scintillation fluid

Liquid scintillation charcoal radon detectors are analyzed by measuring:

(a) alpha and beta particles striking scintillation fluid

(b) alpha particles striking scintillation fluid

(c) gamma energy striking radon decay products

(d) gamma energy striking scintillation fluid

(a) alpha particles

Alpha track detectors are analyzed by measuring the impact on a piece of polycarbonate of:

(a) alpha particles

(b) beta particles

(c) gamma energy

(d) ionization

(c) voltage decrease from ionization in the detector chamber

Electret ion chambers determine radon levels by measuring the:

(a) static charge created by the ionization

(b) voltage decrease due to ionization in the room tested

(c) voltage decrease from ionization in the detector chamber

(d) voltage increase from ionization in the detector chamber

(c) they may report false high readings from unintended exposure during storage

Which is a major disadvantage of filtered alpha track detectors?

(a) they are affected by dust in the air

(b) they are sensitive to background gamma radiation

(c) they may report false high readings from unintended exposure during storage

(d) they must be returned to the laboratory very quickly after exposure

(a) continuous radon monitor

In a real estate transaction, which of the following radon measurement device can be used alone as the sole device to determine the need for mitigation?

(a) continuous radon monitor

(b) diffusion barrier carbon detector

(c) electret ion chamber

(d) open faced charcoal container

(c) absorbs radon

Activated carbon is used to measure radon because the carbon:

(a) absorbs radon

(b) absorbs radon decay products

(c) adsorbs radon

(d) adsorbs radon decay products

(c) they can be exposed for 5 to 7 days

A diffusion barrier charcoal canister has which of the following characteristics:

(a) they are more sensitive to humidity than open-faced canisters

(b) they are sensitive to static electrical charges

(c) they can be exposed for 5 to 7 days

(d) they should not be exposed to ultraviolet light

(a) how much moisture the carbon has absorbed

Charcoal canisters may be weighed when they are returned from deployment to an analysis laboratory to determine:

(a) how much moisture the carbon has absorbed

(b) if anyone has tampered with the test

(c) if the charcoal can be re-used

(d) what the humidity was at the test location

(a) are affected by only one form of radiation

Electret ion chambers have all of the following advantages EXCEPT they:

(a) are affected by only one form of radiation

(b) are a true time integrator

(c) are short- and long-term measurement devices

(d) can be re-used immediately after exposing and reading their voltage

(c) Rn-220

Thoron is the name give to which radon isotope?

(a) Rn-216

(b) Rn-219

(c) Rn-220

(d) Rn-222

(b) 55 seconds

BONUS QUESTION: Thoron's half-life is:

(a) 5 seconds

(b) 55 seconds

(c) 5 minutes

(d) 55 minutes

(d) passive time integrated measurements

Radon measurements which are used to make a mitigation decision and yield only a single average are called:

(a) continuous measurements

(b) continuous grab measurements

(c) passive sniffing measurements

(d) passive time integrated measurements

(b) grab measurements

Radon and radon decay product measurements which are taken over a few seconds or minutes and are allowed to reach secular equilibrium before counting are called:

(a) continuous measurements

(b) grab measurements

(c) sniffing measurements

(d) time integrated measurements

(c) sniffing measurements

BONUS QUESTION: Radon and radon decay products measurements which are taken over a few seconds or minutes, but never counted quantitatively are called:

(a) continuous measurements

(b) grab measurements

(c) sniffing measurements

(d) time integrated measurements

(c) duplicate measurements

Two side-by-side measurements exposed and handled identically and are introduced into the normal sample stream are:

(a) blank measurements

(b) calibration measurement

(c) duplicate measurements

(d) spike measurements

(a) 6.2%

For two identical, collocated measurements of 12.5 and 13.3 the relative percent difference is:

(a) 6.2%

(b) 12.5%

(c) 12.9%

(d) 13.3%

(a) background checks

Measurements to establish the number of counts that must be subtracted from the gross counts are known as:

(a) background checks

(b) calibration

(c) documentation

(d) source checks

(c) documentation

Date and times of measurements, location and conditions of the test, and a description of the detector are examples of:

(a) background checks

(b) calibration

(c) documentation

(d) source checks

(c) two charts, one for duplicate measurements both greater than 4.0 pCi/L and another for both below 4.0 pCi/L

The appropriate number of control charts for a radon measurement service provider using only activated charcoal detectors is:

(a) one chart showing the relative percent difference for 10% of all measurements to a maximum of 50 per month

(b) two charts, for each of the two duplicate measurements above 4.0 pCi/L

(c) two charts, one for duplicate measurements both greater than 4.0 pCi/L and another for both below 4.0 pCi/L

(d) four charts, two for each monitor with two for duplicate measurements both above 4.0 pCi/L and another two charts for both below 4.0 pCi/L

(a) blank measurements

Measurements handled identically to field measurements, except that they are unexposed and are introduced into the sampling stream are:

(a) blank measurements

(b) calibration measurements

(c) duplicate measurements

(d) spike measurements

(d) spike measurements

From which of the following can you calculate sample loss during transport?

(a) blank measurements

(b) calibration measurements

(c) duplicate measurements

(d) spike measurements

(d) 12,13,14,15

Which of the following four sets of radon results taken in the same location at the same time is the most precise?

(a) 6,10,11,13

(b) 8,12,13,13

(c) 9,10,10,15

(d) 12,13,14,15

(b) calibration measurements

Measurements which are taken to determine the relationship between the number decays per unit of time sensed by the measurement device and the number of decays actually occurring at that radon concentration are:

(a) blank measurements

(b) calibration measurements

(c) duplicate measurements

(d) spike measurements

(c) year

EPA protocols recommend that users calibrate their continuous radon monitors at least once every:

(a) three months

(b) six months

(c) year

(d) two years

(a) blank measurements

Which is used to calculate background:

(a) blank measurements

(b) calibration measurements

(c) duplicate measurements

(d) spike measurements

(d) spike measurements

Accuracy of an entire measurement system can best be monitored through the use of:

(a) blank measurements

(b) calibration measurements

(c) duplicate measurements

(d) spike measurements