Unitea States
Environmental Protection
Agency
O'fice of
Radiation Programs
',*Wasningt6n, D.C. 20460
EPA-520/1-87-002
January 1987
Measurement
fpv
Cumulative Proficiencyjieport
(This publication valid through July 1987)
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CUMULATIVE PROFICIENCY REPORT
(This publication is valid through July 1987)
EPA Test Round 3
Prepared by
Radon Technical Information Service
Research Triangle Institute
(919) 541-7131
Prepared for
Office of Radiation Programs
U.S. Environmental Protection Agency
Washington, D.C. 20460
July 1987
U.S. Environmental Protection Agency
Region V, Library
230 South Dearborn Street
Chicago, Illinois 60604
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TABLE OF CONTENTS
Page
Introduction 1
Selection of Measurement Method 4
Program Requirements 9
Explanation of Acronyms - 10
Table 1: Areas Serviced by Measurement Companies • 11
Table 2: Performance Results of Companies 19
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INTRODUCTION
Recent public concern over the health effects from exposure to
radon has greatly increased the demand for companies qualified to meas-
ure radon and radon progeny in indoor air. In response to States' re-
quests for assistance, the U.S. Environmental Protection Agency's Of-
fice of Radiation Programs has developed the Radon/Radon Progeny Meas-
urement Proficiency (RMP) Program. Under this program, any company of-
fering measurement services -- directly, or indirectly through another
company -- is invited to demonstrate its proficiency in measuring radon
gas and radon progeny levels.
The program's immediate objective is to assist States and the
public in selecting companies that have demonstrated competence in mea-
suring indoor radon and radon progeny. This is achieved by evaluat-
ing, on a semiannual basis, the proficiency of companies' detector
operations, and the quality of their data management. Those companies
that demonstrate proficiency in each of these areas are listed in the
Cumulative Proficiency Report. The program's long-term objectives are
to promote standard measurement procedures among measurement companies
and to establish quality assurance procedures for all measurement
companies.
The RMP Program is not designed for accrediting measurement com-
panies. Nor does it certify, recommend, or endorse participating com-
panies. The inclusion of a company in this report should not be inter-
preted as a certification or accreditation of that company. This re-
port is only a source of measurement companies that have demonstrated
capabilities for measuring radon and radon progeny levels.
The testing periods are referred to as test "rounds". Each round
consists of two tests -- a performance test and a follow-up test. A
company enrolls its measurement method(s) (e.g., activated charcoal
adsorption) for evaluation. EPA tells the company to submit a specific
number and type of detectors (e.g., five charcoal canisters) for
exposure to known levels of radon and radon progeny. After exposure in
a federal radon chamber, EPA returns the detectors to the company
without reveal ing the radon gas or radon progeny levels. The company
analyzes the detector(s) and reports its measurement results to EPA.
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EPA compares the measurement results with the known levels of exposure.
If the company's results are within the established screening-
measurement criteria, the method passes the performance test. If not,
the method is automatically tested again in the follow-up test. The
same detector submittal and exposure procedures are followed for the
follow-up test. A company must take part in the follow-up test if it
fails any of the program requirements in the performance test, not sim-
ply tne screening-measurement criteria. Companies that fail again in
the follow-up test may participate in the next test round.
Only companies having niet all the program requirements for a meth-
od(s) in either the performance or the follow-up test for a round are
listed in this report. The companies that meet all the program re-
quirements in the initial performance test are listed with an "Ll" in-
dicator under the appropriate method(s). Companies that meet all the
requirements in the follow-up test are listed with an "LA" indicator
under the appropriate method(s). A company's method that fails after
having been listed in a previous round's report will be omitted entire-
ly from the report and will not b§ reinstated until its next successful
performance in a round. When the' method passes again, its performance
indicators for the previous three rounds as well as for the present
round will oe listed. Upon reinstatement, the round during which the
method had failed will be marked with an "NL" indicator, signifying its
omission from that round's report.
Table 1 lists all the proficient companies in the States where
they provide services. Numerous companies distribute mail-in detec-
tors and make measurements nationwide. Therefore, the companies offer-
ing nationwide service are listed first under "National" heading, and
those serving individual States only are listed next.
Table 2 lists the companies' performance indicators for each round
over a two-year period. It indicates if they are "primary" or
"secondary" companies, and shows whether they have submitted acceptable
quality assurance (QA) plans.
A primary company either owns analysis capabilities or makes all
measurements and analyses with its own instrumentation and operators.
This type of company may or may not offer measurement services directly
to the public. A secondary company's services may range from detector
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distribution to home inspection and consultation. This type of company
must use one of the primary companies for its analyses. In a case
where a company offers primary services for one method but not another,
the performance indicators in Table 2 are underscored to mark the
method(s) for which it is a primary company.
EPA has asked, but has not required, that participating companies
submit for review a copy of their QA plans. An X under the column
headed "QA Plan" in Table 2 indicates that the company has submitted a
plan that complies with the QA criteria recommended by this program.
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SELECTION OF MEASUREMENT METHOD
Several different measurement methods may be used to determine the
radon or radon progeny concentrations in houses. In practice, the
choice of a method is often dictated simply by availability — if an
adequate method is available, you use it. If alternative methods are
available, then the cost or the duration of the measurement may become
the deciding factor.
EPA has developed measurement protocols for seven different meth-
ods, and believes that any of them, when used in accordance with EPA
protocols, can produce valid results. This does not mean that all
measurements made according to the suggested protocols will produce
results with identical uncertainties. However, it does mean that the
listed methods are capable of producing adequate results for screening
or follow-up aurooses.
Each method has its own advantages and disadvantages. Users must
decide which method is best suited to their situations. The following
sections detail the characteristics of the seven methods, pointing out
some of the advantages and disadvantages of each one. This summary is
not exhaustive, but is intended to guide the user in making an informed
selection of a measurement method.
Continuous Radon Monitoring (CR) and Continuous Working-Level
Monitoring (CW)
These measurement methods are similar in that they use an elec-
tronic detector to accumulate and store information related to the pe-
riodic (usually hourly) average concentrations of radon gas or radon
progeny. They are installed in houses according to guidelines in the
EPA protocol, and then turned on, or programmed for, the desired oper-
ating time -- a minimum of six hours for screening and twenty-four
hours for follow-up measurements. At the end of the test, the monitor
must be retrieved, and the results must be analyzed by a skilled
instrument operator.
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Advantages
o Relatively short measurement duration.
o Hourly results can track the variation ,of concentrations in the
house.
o Very precise (most models).
o Results are available on-site (for CW).
Disadvantages
o Relatively expensive, cost may range from $100 to $300, depend-
ing on the type of services provided.
o Requires a skilled instrument operator.
o This, as does any short-term measurement, requires careful con-
trol of closed-house conditions twelve hours before and during
the test.
Alpha-rrack Detection (AT)
The aloha-track method measures radon. An AT detector is a small
sheet of special plastic material enclosed in a filtered container.
The container collects the radon progeny on the filter paper while the
radon gas enters the container. As the gas and some of the short-lived
progeny decay, they emit alpha particles that permanently mark the
olastic sheet.
The detectors are installed in the home according to guidelines in
the EPA protocol. They are left for periods of up to three months for
screening and twelve months for follow-up measurements. At the end of
the desired testing period, they must be returned to the distributor or
analytical laboratory for processing and evaluation.
Advantages
o Relatively low-cost services; cost may range from $20 to $60.
o Mo special skills required for making the measurement.
o Can be distributed by mail.
o Completely passive, needs no external power.
o Can measure the long-term average concentrations over a twelve-
month period, which is the optimal measurement of long-term
concentrations.
Disadvantages
o Relatively long measurement period necessary: three months is
the recommended minimum for currently available detectors.
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Activated Charcoal Adsorption (CC)
The charcoal adsorption method measures radon gas. The detectors
for this method consist of variously configured containers filled with
a measured amount of activated charcoal. The container is often per-
forated or screened to keep the charcoal from falling out, and to fil-
ter out radon progeny. All charcoal adsorbers are stored in airtight
containers when not being used for sampling.
Charcoal adsorbers can be received through the mail from a distri-
butor. They are installed in the home for up to seven days according
to guidelines in the EPA protocols. At the end of testing, an adsorber
is resealed and returned to the distributor or analytical laboratory
for processing and evaluation.
Advantages
o Low cost for services; costs may range from S10 to 525.
o Can be distributed by mail.
o No special skills needed for making the measurement.
o Completely passive, needs .no external power.
o Uith proper analysis, can yield precise results.
Disadvantages
o Some charcoal adsorbers are more sensitive than others to tem-
perature and humidity.
o Limited to short-term testing.
o Requires, as does any short-term measurement, careful control
of closed-house conditions twelve hours before and during the
test.
Radon Progeny Integrating Sampling Unit-RPISU (RP)
The RP method measures radon progeny. RP detectors have a flow-
rate air pump that pulls air continuously through a detector assembly.
Depending on the model, the unit can be installed and operated by home-
owners or skilled operators for three days or longer, according to
guidelines in the EPA protocol. At the end of that time, the homeowner
sends it to the distributor, or an operator removes the unit and
returns it to the analysis laboratory for processing and evaluation.
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Advantages
o Directly measures concentrations of radon decay products.
o Relatively short measurement period.
o The detector assembly and some entire units can be sent by
mail.
o There is extensive experience in the use of RPISU's; therefore,
measurement errors are well established.
Disadvantages
o Relatively expensive; cost may range from $40 to $150, depend-
ing on type of service provided.
o Some models may be both heavy and awkward to move.
o May be limited to locations with AC power.
o Some units must be installed and picked up by a skilled instru-
ment operator.
o Because of the highly reactive nature of radon decay products,
measurements are much more susceptible to sampling error than
radon gas measurements.
3rab Sampling (GW) - 3adon (GR) and Radon Progeny (GN)
The grab sampling methods measure concentrations of radon gas or
radon progeny concentrations. The radon grab sample is collected in a
special flask holding 100 to 2,000 cubic centimeters of air. The radon
progeny grab sample is collected by drawing air through a filter, upon
which progeny, if present in the air, are collected. Both samples can
be acquired simultaneously with some detector systems. All sampling
should be done in accordance with guidelines in the EPA protocols.
For results of the grab radon test, operators must return to their
offices to analyze the exposed detectors, and must delay the analysis
for at least four hours after the testing. For most grab workinq-level
tests (radon progeny), operators can perform the analysis on location
i n an hour or less,
Advantages
o Results are quickly obtained.
o Equipment can be portable.
o Some detector systems can sample both radon gas and radon
progeny simultaneously.
o Can acquire and evaluate several samples per day.
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o Conditions during the measurement are known to the operator.
Disadvantages
o Relatively expensive; costs may range from $80 to S300
depending on the type of services offered.
o Very short measurement periods may not be representative of the
long-term average concentrations.
o Requires a skilled operator.
o Requires, as does any short-term measurement, careful control
of closed-house conditions twelve hours before and durinq the
test. 3
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PROGRAM REQUIREMENTS
For each method, participants must send with their applications a
copy of the operating instructions that they provide to homeowners and/
or are used by an instrument operator. These instructions must reflect
the measurement procedures found in the EPA documents, "Interim Indoor
R »*on and Radon Decay Product Measurement Protocols" and "Interim
Protocols for Screening and Follow-up Radon and Radon Decay Product
Measurements". They must be accepted by, and on file with EPA by the
end of the follow-up test.
Once enrolled, a company must meet EPA's minimum screening-meas-
urement requirements for each method. A company must meet all detector
and analysis result deadlines as listed on the program schedule. Ap-
plications, detactors, and analyses reporting forms received after a
scheduled deadline -vill not be considered in the performance evaluation
process. A company's detector(s) must be tested every round to
maintain its proficiency listing.
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EXPLANATION OF ACRONYMS
Methods " Units
AT - Alpha-Track Detection (pCi/1)
CC - Activated Charcoal Adsorption (pCi/1)
CR - Continuous Radon Monitoring (pCi/1)
CW - Continuous Working-Level Monitoring (WL)
GR - Grab Radon Sampling (pCi/1)
GW - Grab Working-Level Sampling (WL)
RP - Radon Progeny Integrated Sampling/RPISU (WL)
Measurement Units
pCi/1 - Picocuries per liter air, radon gas measurement units.
WL - Working-1evel, radon progeny measurement units.
Performance Indicators
Ll - Signifies a company's ability to pass a:l program requirements
with the given measurement method in the performance test.
LA - Signifies a company's ability to pass all program requirements
with the given method only after the follow-up test.
NL - Signifies a metnod's omission from the CPR because of unsuccessful
participation. This indicator is only used when a method has
passed a round, then failed, resulting in its performance record
being omitted from a previous report, and has now passed again.
"NL" is used in the method's reinstated performance record.
Others
QA - Quality assurance.
OT - Oetector(s) damaged or lost through no fault of the participant.
10
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