Akademik Veri Yönetim Sistemi
Insitu nuclear metrology as a tool for radioecelogy INSINUME2017, Ohrid, Makedonya, 24 - 28 Nisan 2017, ss.73
Coal-fired power plants have been neglected as radiation sources for a
long time. They became important for investigations as a result of the
advancement of the scientific knowledge of biological effects of
radiation action on humans and after dose limits reduction in
international recommendations and standards. Coal combustion in power
plants leads to the redistribution of natural radionuclides getting out
from coal, and to their concentration in ash and slag. Coal, lignite and
their combustion residues contain trace elements, including naturally
occurring radionuclides (1). Mathematical models are both economical and
practice applications for estimation of ecological risks in the future
and validation of observations and measures in the past. Therefore,
environmental models are extensively used for monitoring of air
pollution or determination and evaluation of air quality.
In this study, atmospheric dispersion and deposition of some
radionuclides (232Th, 226Ra, 40K) in the flying ash originating from
Orhaneli, Tuncbilek and Seyitomer Coal Power Plants located in Western
Anatolia-Turkey are simulated (2). For this purpose, CAP88PC which was
developed by USEPA and based on Gaussian dispersion equation are used.
Meteorological input data were obtained from weather stations of Turkish
State Meteorological Service. Releases data (source term) were supplied
from other studies in the literature. After the simulations, model
outputs were digitized and visualized through a Geographic Information
System (GIS) software.
The results showed that radioactivity concentration of 232Th relatively
higher than radioactivity concentration of 40K and 226Ra around the
Orhaneli Coal Fired Power Plant due to flying ash concentrations. The
yearly dispersion of fly ashes from Tuncbilek and Seyitomer Coal Power
Plants mainly dispersed to the West and North direction while ashes from
Orhaneli Coal Power Plant dispersed to the Southeast direction.