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Radiation Protection Dosimetry Advance Access published online on September 20, 2006
Radiation Protection Dosimetry, doi:10.1093/rpd/ncl138
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org
Received March 31, 2006
Revised June 14, 2006
Accepted August 18, 2006

TECHNICAL NOTE

MODELLING AND ANALYSES DO NOT SUPPORT THE HYPOTHESIS THAT CHARGING BY POWER-LINE CORONA INCREASES LUNG DEPOSITION OF AIRBORNE PARTICLES

David Jeffers 1 *

1 Meadland, Three Gates Lane, Haslemere, Surrey GU 27 2 LD, UK

* To whom correspondence should be addressed.
David Jeffers, E-mail: jeffers991{at}btinternet.com


  Abstract

The National Radiological Protection Board's advisory Group on Non-ionising Radiation has recommended further study on the effects of electric charge on the deposition of 0.005-1 µm particles in the lung. Estimates have been made regarding the integrated ion exposure within the corona plume generated by a power line and by ionisers in an intensive care unit. Changes in the charge state of particles with sizes in the range 0.02-13 µm have been calculated for these exposures. The corona plume increases the charge per particle of 0.02 and 0.1 µm particles by the order of 0.1. The ionisers in the intensive care unit produced negative ions--as do power lines under most conditions. Bacteria can carry in the order of 1000 charges (of either sign) and it is shown that the repulsion between such a negatively charged bacterium and negative ions prevents further ion deposition by diffusion charging. Positively charged bacteria can, however, be discharged by the ions which are attracted to them. The data provide no support for the hypothesis that ion exposure, at the levels considered, can increase deposition in the lung.


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