The NIST Primary Radon-222 Measurement System |
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Authors: | R Collé J M R Hutchinson M P Unterweger |
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Affiliation: | National Institute of Standards and Technology, Gaithersburg, MD 20899 |
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Abstract: | Within the United States, the national standard for radon measurements is embodied in a primary radon measurement system that has been maintained for over 50 years to accurately measure radon (222Rn) against international and national radium (226Ra) standards. In turn, all of the radon measurements made at the National Institute of Standards and Technology (NIST) and the radon transfer calibration standards and calibration services provided by NIST are directly related to this national radon standard. This primary radon measurement system consists of pulse ionization chambers and ancillary gas handling and gas purification equipment. The system is currently undergoing a significant upgrading and expansion which will replace the extant outdated system. |
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Keywords: | calibration ionization chambers measurement radium-225 radon-222 standards |
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