Analysis Of The Natural Radon Progeny
Contribution To Radioactive Aerosol Monitoring
In The Automatic Spanish Surveillance Network
Author(s)
D. Arnold, A. Vargas, G. Cortés & X. Ortega
Abstract
Continuous monitoring of radioactive pollutants in the air is provided by
environmental radiological surveillance networks. In Spain, continuous and
automatic control is carried out by the REA network, which comprises a set of
25 automatic stations. Most of these stations are run together with
meteorological stations, belonging to the Spanish Meteorological Institute. The
monitor for measuring the artificial radioactive aerosol concentration is the BAI
9850 from Berthold Company. An important contribution to the uncertainty of
its measurements is due to natural air radioactivity, mainly from radon progeny.
A statistical study using the data from the REA and the INM radiological and
meteorological stations has been carried out in order to characterize the natural
radioactivity at each station and to improve the quality of the artificial
radioactivity air concentration measurements. This study shows that natural
radioactivity concentration varies both daily and seasonally, and is significantly
correlated to meteorological parameters and the geological properties of station
surroundings. Radon progeny concentration commonly shows a daily cycle with
a maximum in the early morning and a minimum in the afternoon, according to
the behaviour of meteorological parameters. However, at a station situated at a
higher altitude, the radon progeny pattern is completely different, due to the
evolution of the planetary boundary layer above this complex terrain. Stations
have been classified into coastal, inland and mountain according to the behaviour
of the natural radioactivity at each location. A representative station from each
category has been selected and a simulation study is being carried out using the
MM5 code coupled with the atmospheric transport code FLEXPART.
Keywords: radon, radioactive pollutants, radiological surveillance.
Keywords
radon, radioactive pollutants, radiological surveillance.
Related Book
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