Journal article
An International Marine-Atmospheric 222Rn Measurement Intercomparison in Bermuda Part II: Results for the Participating Laboratories
Journal of research of the National Institute of Standards and Technology, v 101(1), pp 21-46
01 Jan 1996
PMID: 27805091
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
As part of an international measurement intercomparison of instruments used to measure atmospheric
222
Rn, four participating laboratories made nearly simultaneous measurements of
222
Rn activity concentration in commonly sampled, ambient air over approximately a 2 week period, and three of these four laboratories participated in the measurement comparison of 14 introduced samples with known, but undisclosed (“blind”)
222
Rn activity concentration. The exercise was conducted in Bermuda in October 1991. The
222
Rn activity concentrations in ambient Bermudian air over the course of the intercomparison ranged from a few hundredths of a Bq · m
−3
to about 2 Bq · m
−3
, while the standardized sample additions covered a range from approximately 2.5 Bq · m
−3
to 35 Bq · m
−3
. The overall uncertainty in the latter concentrations was in the general range of 10 %, approximating a 3 standard deviation uncertainty interval. The results of the intercomparison indicated that two of the laboratories were within very good agreement with the standard additions, and almost within expected statistical variations. These same two laboratories, however, at lower ambient concentrations, exhibited a systematic difference with an averaged offset of roughly 0.3 Bq · m
−3
. The third laboratory participating in the measurement of standardized sample additions was systematically low by about 65 % to 70 %, with respect to the standard addition which was also confirmed in their ambient air concentration measurements. The fourth laboratory, participating in only the ambient measurement part of the intercomparison, was also systematically low by at least 40 % with respect to the first two laboratories.
Metrics
Details
- Title
- An International Marine-Atmospheric 222Rn Measurement Intercomparison in Bermuda Part II: Results for the Participating Laboratories
- Creators
- R. Collé - National Institute of Standards and TechnologyM. P. Unterweger - National Institute of Standards and TechnologyJ. M. R. Hutchinson - National Institute of Standards and TechnologyS. Whittlestone - Australian Nuclear Science and Technology OrganisationGeorges Polian - Centre des Faibles Radioactivités, Laboratoire Mixte, C.N.R.S-C.E.A., 91198 Gif-sur-Yvette, France.Bénédicte Ardouin - Centre des Faibles Radioactivités, Laboratoire Mixte, C.N.R.S-C.E.A., 91198 Gif-sur-Yvette, France.Jack G. Kay - Drexel UniversityJames P. Friend - Drexel UniversityByron W. Blomquist - Drexel UniversityWolfgang Nadler - Drexel UniversityThomas T. Dang - Drexel UniversityR. J. Larsen - United States Department of EnergyA. R. Hutter - United States Department of Energy
- Publication Details
- Journal of research of the National Institute of Standards and Technology, v 101(1), pp 21-46
- Publisher
- U.S. Dept. of Commerce, National Institute of Standards and Technology; Gaithersburg, MD
- Grant note
- 9999-NIST / National Institute of Standards and Technology
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- [Retired Faculty]
- Web of Science ID
- WOS:A1996UE68600002
- Scopus ID
- 2-s2.0-0030469016
- Other Identifier
- 991019168309904721
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- Collaboration types
- Domestic collaboration
- International collaboration
- Web of Science research areas
- Instruments & Instrumentation
- Physics, Applied