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Title: Effects of particle size and velocity on burial depth of airborne particles in glass fiber filters

Abstract

Air sampling for particulate radioactive material involves collecting airborne particles on a filter and then determining the amount of radioactivity collected per unit volume of air drawn through the filter. The amount of radioactivity collected is frequently determined by directly measuring the radiation emitted from the particles collected on the filter. Counting losses caused by the particle becoming buried in the filter matrix may cause concentrations of airborne particulate radioactive materials to be underestimated by as much as 50%. Furthermore, the dose calculation for inhaled radionuclides will also be affected. The present study was designed to evaluate the extent to which particle size and sampling velocity influence burial depth in glass-fiber filters. Aerosols of high-fired /sup 239/PuO/sub 2/ were collected at various sampling velocities on glass-fiber filters. The fraction of alpha counts lost due to burial was determined as the ratio of activity detected by direct alpha count to the quantity determined by photon spectrometry. The results show that burial of airborne particles collected on glass-fiber filters appears to be a weak function of sampling velocity and particle size. Counting losses ranged from 0 to 25%. A correction that assumes losses of 10 to 15% would ensure that the concentrationmore » of airborne alpha-emitting radionuclides would not be underestimated when glass-fiber filters are used. 32 references, 21 figures, 11 tables.« less

Authors:
Publication Date:
Research Org.:
Pacific Northwest Lab., Richland, WA (USA)
OSTI Identifier:
6312811
Report Number(s):
PNL-5278
ON: DE85002456
DOE Contract Number:  
AC06-76RL01830
Resource Type:
Technical Report
Resource Relation:
Other Information: Thesis. Submitted to Univ. of Washington, Seattle
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR SAMPLERS; ALPHA DETECTION; AIR FILTERS; EXPERIMENTAL DATA; PARTICULATES; PLUTONIUM 239; PLUTONIUM OXIDES; RADIOACTIVE AEROSOLS; SIZE; VELOCITY; ACTINIDE COMPOUNDS; ACTINIDE ISOTOPES; ACTINIDE NUCLEI; AEROSOLS; ALPHA DECAY RADIOISOTOPES; CHALCOGENIDES; CHARGED PARTICLE DETECTION; COLLOIDS; DATA; DETECTION; DISPERSIONS; EQUIPMENT; EVEN-ODD NUCLEI; FILTERS; HEAVY NUCLEI; INFORMATION; ISOTOPES; NUCLEI; NUMERICAL DATA; OXIDES; OXYGEN COMPOUNDS; PARTICLES; PLUTONIUM COMPOUNDS; PLUTONIUM ISOTOPES; POLLUTION CONTROL EQUIPMENT; RADIATION DETECTION; RADIOISOTOPES; SAMPLERS; SOLS; TRANSURANIUM COMPOUNDS; YEARS LIVING RADIOISOTOPES; 500300* - Environment, Atmospheric- Radioactive Materials Monitoring & Transport- (-1989)

Citation Formats

Higby, D.P. Effects of particle size and velocity on burial depth of airborne particles in glass fiber filters. United States: N. p., 1984. Web. doi:10.2172/6312811.
Higby, D.P. Effects of particle size and velocity on burial depth of airborne particles in glass fiber filters. United States. doi:10.2172/6312811.
Higby, D.P. Thu . "Effects of particle size and velocity on burial depth of airborne particles in glass fiber filters". United States. doi:10.2172/6312811. https://www.osti.gov/servlets/purl/6312811.
@article{osti_6312811,
title = {Effects of particle size and velocity on burial depth of airborne particles in glass fiber filters},
author = {Higby, D.P.},
abstractNote = {Air sampling for particulate radioactive material involves collecting airborne particles on a filter and then determining the amount of radioactivity collected per unit volume of air drawn through the filter. The amount of radioactivity collected is frequently determined by directly measuring the radiation emitted from the particles collected on the filter. Counting losses caused by the particle becoming buried in the filter matrix may cause concentrations of airborne particulate radioactive materials to be underestimated by as much as 50%. Furthermore, the dose calculation for inhaled radionuclides will also be affected. The present study was designed to evaluate the extent to which particle size and sampling velocity influence burial depth in glass-fiber filters. Aerosols of high-fired /sup 239/PuO/sub 2/ were collected at various sampling velocities on glass-fiber filters. The fraction of alpha counts lost due to burial was determined as the ratio of activity detected by direct alpha count to the quantity determined by photon spectrometry. The results show that burial of airborne particles collected on glass-fiber filters appears to be a weak function of sampling velocity and particle size. Counting losses ranged from 0 to 25%. A correction that assumes losses of 10 to 15% would ensure that the concentration of airborne alpha-emitting radionuclides would not be underestimated when glass-fiber filters are used. 32 references, 21 figures, 11 tables.},
doi = {10.2172/6312811},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Nov 01 00:00:00 EST 1984},
month = {Thu Nov 01 00:00:00 EST 1984}
}

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