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Title: Uranium mill ore dust characterization

Abstract

Cascade impactor and general air ore dust measurements were taken in a uranium processing mill in order to characterize the airborne activity, the degree of equilibrium, the particle size distribution and the respirable fraction for the /sup 238/U chain nuclides. The sampling locations were selected to limit the possibility of cross contamination by airborne dusts originating in different process areas of the mill. The reliability of the modified impactor and measurement techniques was ascertained by duplicate sampling. The results reveal no significant deviation from secular equilibrium in both airborne and bulk ore samples for the /sup 234/U and /sup 230/Th nuclides. In total airborne dust measurements, the /sup 226/Ra and /sup 210/Pb nuclides were found to be depleted by 20 and 25%, respectively. Bulk ore samples showed depletions of 10% for the /sup 226/Ra and /sup 210/Pb nuclides. Impactor samples show disequilibrium of /sup 226/Ra as high as +-50% for different size fractions. In these samples the /sup 226/Ra ratio was generally found to increase as particle size decreased. Activity median aerodynamic diameters of the airborne dusts ranged from 5 to 30 ..mu..m with a median diameter of 11 ..mu..m. The maximum respirable fraction for the ore dusts, based onmore » the proposed International Commission on Radiological Protection's (ICRP) definition of pulmonary deposition, was < 15% of the total airborne concentration. Ore dust parameters calculated for impactor duplicate samples were found to be in excellent agreement.« less

Authors:
;
Publication Date:
Research Org.:
Department of Energy, New York (USA). Environmental Measurements Lab.
OSTI Identifier:
6691840
Alternate Identifier(s):
OSTI ID: 6691840
Report Number(s):
EML-384
TRN: 81-003180
Resource Type:
Technical Report
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; LEAD 210; RADIATION MONITORING; RADIOACTIVE AEROSOLS; AEROSOL MONITORING; PARTICLE SIZE; RADIUM 226; THORIUM 230; URANIUM 234; URANIUM 238; CASCADE IMPACTORS; DATA COMPILATION; DISTRIBUTION; DUSTS; EQUILIBRIUM; ERRORS; FEED MATERIALS PLANTS; URANIUM ORES; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; AEROSOLS; ALKALINE EARTH ISOTOPES; ALPHA DECAY RADIOISOTOPES; BETA DECAY RADIOISOTOPES; BETA-MINUS DECAY RADIOISOTOPES; COLLOIDS; DATA; DISPERSIONS; EVEN-EVEN NUCLEI; HEAVY NUCLEI; INDUSTRIAL PLANTS; INFORMATION; ISOTOPES; LEAD ISOTOPES; MONITORING; NUCLEAR FACILITIES; NUCLEI; NUMERICAL DATA; ORES; RADIOISOTOPES; RADIUM ISOTOPES; SIZE; SOLS; THORIUM ISOTOPES; URANIUM ISOTOPES; YEARS LIVING RADIOISOTOPES 500300* -- Environment, Atmospheric-- Radioactive Materials Monitoring & Transport-- (-1989)

Citation Formats

Knuth, R.H., and George, A.C. Uranium mill ore dust characterization. United States: N. p., 1980. Web. doi:10.2172/6691840.
Knuth, R.H., & George, A.C. Uranium mill ore dust characterization. United States. doi:10.2172/6691840.
Knuth, R.H., and George, A.C. Sat . "Uranium mill ore dust characterization". United States. doi:10.2172/6691840. https://www.osti.gov/servlets/purl/6691840.
@article{osti_6691840,
title = {Uranium mill ore dust characterization},
author = {Knuth, R.H. and George, A.C.},
abstractNote = {Cascade impactor and general air ore dust measurements were taken in a uranium processing mill in order to characterize the airborne activity, the degree of equilibrium, the particle size distribution and the respirable fraction for the /sup 238/U chain nuclides. The sampling locations were selected to limit the possibility of cross contamination by airborne dusts originating in different process areas of the mill. The reliability of the modified impactor and measurement techniques was ascertained by duplicate sampling. The results reveal no significant deviation from secular equilibrium in both airborne and bulk ore samples for the /sup 234/U and /sup 230/Th nuclides. In total airborne dust measurements, the /sup 226/Ra and /sup 210/Pb nuclides were found to be depleted by 20 and 25%, respectively. Bulk ore samples showed depletions of 10% for the /sup 226/Ra and /sup 210/Pb nuclides. Impactor samples show disequilibrium of /sup 226/Ra as high as +-50% for different size fractions. In these samples the /sup 226/Ra ratio was generally found to increase as particle size decreased. Activity median aerodynamic diameters of the airborne dusts ranged from 5 to 30 ..mu..m with a median diameter of 11 ..mu..m. The maximum respirable fraction for the ore dusts, based on the proposed International Commission on Radiological Protection's (ICRP) definition of pulmonary deposition, was < 15% of the total airborne concentration. Ore dust parameters calculated for impactor duplicate samples were found to be in excellent agreement.},
doi = {10.2172/6691840},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Nov 01 00:00:00 EST 1980},
month = {Sat Nov 01 00:00:00 EST 1980}
}

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