An international marine-atmospheric 222Rn measurement intercomparison in Bermuda. Part 1: NIST calibration and methodology for standardized sample additions
AbstractAbstract
[en] As part of an international 222Rn measurement intercomparison conducted at Bermuda in October 1991, NIST provided standardized sample additions of known, but undisclosed (blind) 222Rn concentrations that could be related to US national standards. The standardized sample additions were obtained with a calibrated 226Ra source and a specially-designed manifold used to obtain well-known dilution factors from simultaneous flow-rate measurements. The additions were introduced over sampling periods of several hours (typically 4 h) into a common streamline on a sampling tower used by the participating laboratories for their measurements. The standardized 222Rn activity concentrations for the intercomparison ranged from approximately 2.5 Bq · m-3 to 35 Bq · m-3 (of which the lower end of this range approached concentration levels for ambient Bermudian air) and had overall uncertainties, approximating a 3 standard deviation uncertainty interval, of about 6% to 13%. This paper describes the calibration and methodology for the standardized sample additions
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Journal of Research of the National Institute of Standards and Technology; ISSN 1044-677X; ; CODEN JRITEF; v. 101(1); p. 1-19
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ALPHA DECAY RADIOISOTOPES, CARBON 14 DECAY RADIOISOTOPES, COOPERATION, DAYS LIVING RADIOISOTOPES, ECOLOGICAL CONCENTRATION, EVEN-EVEN NUCLEI, HEAVY ION DECAY RADIOISOTOPES, HEAVY NUCLEI, ISLANDS, ISOTOPES, MEASURING INSTRUMENTS, MONITORING, MONITORS, NUCLEI, POLLUTION, RADIOISOTOPES, RADIUM ISOTOPES, RADON ISOTOPES, STANDARDS, YEARS LIVING RADIOISOTOPES
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