ANSTO Publications Online >
Journal Publications >
Journal Articles >

Please use this identifier to cite or link to this item: http://apo.ansto.gov.au/dspace/handle/10238/3136

Title: Estimating the Asian radon flux density and its latitudinal gradient in winter using ground-based radon observations at Sado Island.
Authors: Williams, AG
Chambers, S
Zahorowski, W
Crawford, J
Matsumoto, K
Uematsu, M
Keywords: Asia
Radon 222
Flux Density
Japan
Islands
Meteorology
Issue Date: Nov-2009
Publisher: Wiley-Blackwell
Citation: Williams, A. G., Chambers, S., Zahorowski, W., Crawford, J., Matsumoto, K., & Uematsu, M. (2009). Estimating the Asian radon flux density and its latitudinal gradient in winter using ground-based radon observations at Sado Island. Tellus Series B-Chemical and Physical Meteorology, 61(5), 732-746.
Abstract: Terrestrial radon-222 flux density for the Asian continent, integrated over distances of 4500 km, is estimated in two 20° latitudinal bands centred on 48.8°N and 63.2°N. The evaluation is based on three years of wintertime radon measurements at Sado Island, Japan, together with meteorological and trajectory information. A selection of 18% of observations are suitable for evaluation of an analytical expression for the continental surface flux. Various meteorological assumptions are discussed; it is found that there is a substantial effect of increased complexity of the formulation on the flux estimates obtained. The distribution of spatially integrated radon flux over the Asian landmass is reported for the first time. Expressed as geometric means and 1σ-ranges, estimated fluxes are 14.1 mBq m−2 s−1 (1σ-range: 18 mBq m−2 s−1) and 8.4 mBq m−2 s−1 (1σ-range: 10 mBq m−2 s−1) for the lower and higher latitude bands. These results constitute an annual minimum in flux densities for these regions, and are higher than previously reported. The existence of a latitudinal gradient in the continental radon source function is confirmed; the present estimate for Asia (−0.39 mBq m−2 s−1 per degree of latitude) is in agreement with the northern hemisphere terrestrial radon flux gradient proposed previously. © 2009, Wiley-Blackwell. The definitive version is available at www3.interscience.wiley.com
URI: http://dx.doi.org/10.1111/j.1600-0889.2009.00438.x
http://apo.ansto.gov.au/dspace/handle/10238/3136
ISSN: 0280-6509
Appears in Collections:Journal Articles

Files in This Item:

There are no files associated with this item.

Items in APO are protected by copyright, with all rights reserved, unless otherwise indicated.

 

Valid XHTML 1.0! DSpace Software Copyright © 2002-2010  Duraspace - Feedback