Determining Radon Anomalies Lower Limit Based on Fractal Theory
Wang Wen-gu · Hedianzixue yu tance jishu · 2013
Determination of the radon anomalies lower limit did not have uniform standard,especially in low radioactive area,there are many uncertain factors.Using fractal theory in the processing of radon values,taking the content-frequency method,the content-area method and the content-perimeter method,making Excel,Sufer and AutoCAD as the platform,the lower limit of abnormity of radon is determined.The research indicated that cut-off point is determined according to cut-off point evaluation coefficient,the obvious changes of fractal dimension on both sides of which effectively reflect the background and anomaly radon distribution differences.Taking the average value of three ways of fractals as radon anomalies lower limit,by which the scope of radon anomalies is drawn,is obviously better compared to traditional method.Consequently a new idea to determine radon anomalies lower limit is offered in low radioactive area.