Requirements for quality control of radiochemical analyses
shall be as follows:
control data and records shall be available for inspection.
(2) The laboratory shall participate at least
twice each year in those EPA laboratory intercomparison studies that include
each of the analyses for which the laboratory is, or wants to be, certified.
Analytical results shall be within control limits described in "Environmental
Radioactivity Laboratory Intercomparison Studies" Program-FY-1977
(EPA-600/4-77-001), which is hereby incorporated by reference including any
subsequent amendments and editions. A copy is available for inspection at the
Division of Public Health, 1915 Mail Service Center, Raleigh, North Carolina
27699-1915. A copy may be obtained by contacting the EPA Office of Research and
Development at 513-569-7562 at no charge.
(3) The laboratory shall participate once
each year in an appropriate unknown performance study administered by EPA.
Analytical results shall be within control limits established by EPA for each
analysis for which the laboratory is, or wants to be, certified.
(4) Operating manuals and calibration
protocols for counting instruments shall be available to analysts and
(5) Calibration data
and maintenance records on all radiation instruments and analytical balances
shall be maintained in a permanent record.
The following specifications shall be
included in minimum daily quality control:
(a) To verify internal laboratory precision
for a specific analysis, a minimum of 10 percent duplicate analyses shall be
performed. The difference between duplicate measurements shall be less than two
times the standard deviation of the specific analysis as described in
EPA-600/4-77-001. If the difference exceeds two standard deviations,
calculations and procedures shall be examined, and samples shall be
(b) When 20 or more
specific analyses are performed each day, a performance standard and a
background sample shall be measured with each 20 samples. If less than 20
specific analyses are performed in any one day, a performance standard and a
background sample shall be measured along with the samples.
(c) Quality control performance charts, or
performance records, shall be available for inspection.