The NIST primary radon-222 measurement system
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چکیده
منابع مشابه
The NIST Primary Radon-222 Measurement System
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 calibrat...
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The NIST (National Institute of Standards and Technology) has recently made available 222Rn emanation standards for test and evaluation. The NIST certified parameters include the ^ ~ a strength and the emanation coefficient. When such a source is loaded into a radon leak tight enclosure of a known volume, 222~n accumulates over time and it is possible to calculate precisely the time integrated ...
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Groundwater samples were collected from eight wells in remote Antelope Creek valley, Idaho. Seven out of eight locations showed that groundwater 222 Rn concentrations were much greater than 11 Bq/L (300 pCi/L), a maximum contaminant level (MCL) proposed by United States Environmental Protection Agency (USEPA). Rock and soil samples collected near the sampling wells revealed that 238 U contents ...
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Apparently large exposures of the general public to the radioactive decay products of radon-222 present in indoor air have led to systematical appraisal of monitoring data from U.S. single-family homes; several ways of aggregating data were used that take into account differences in sample selection and season of measurements. The resulting distribution of annual-average radon-222 concentration...
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Although occupational epidemiological studies and animal experimentation provide strong evidence that radon-222 (222Rn) progeny exposure causes lung cancer, residential epidemiological studies have not confirmed this association. Past residential epidemiological studies have yielded contradictory findings. Exposure misclassification has seriously compromised the ability of these studies to dete...
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ژورنال
عنوان ژورنال: Journal of Research of the National Institute of Standards and Technology
سال: 1990
ISSN: 1044-677X
DOI: 10.6028/jres.095.018