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http://dx.doi.org/10.7742/jksr.2013.7.1.025

Time Series Analysis of Gamma exposure rates in Gangneung Area  

Cha, Hohwan (Department of Physics, Gangneung-Wonju National University)
Kim, Jaehwa (Department of Physics, Gangneung-Wonju National University)
Publication Information
Journal of the Korean Society of Radiology / v.7, no.1, 2013 , pp. 25-30 More about this Journal
Abstract
In this work, we investigate the statistical properties of gamma exposure rates using well-known analysis methods, such as Autocorrelation Function Analysis(ACF), Rescaled Range Analysis(R/S Analysis), and Detrended Fluctuation Analysis(DFA). Especially, DFA is an important method to reliably detect long-range correlations in non-stationary time series. Our data are measured by Gangneung regional radiation monitoring station over the period of 1998 to 2011. First, we find a crossover indicating two different governing regimes in fluctuations of gamma exposure rates. Within a year, they show a strong long-ranged memory while this property vanishes over the range of time period longer than one year. Second, our finding is very securely supported by a variety of analysis tools. Those tools yield many relevant exponents which satisfies the well known relation between them.
Keywords
Fractal; Time series analysis; Gamma exposure rates; ACF; R/S Analysis; DFA;
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Times Cited By KSCI : 4  (Citation Analysis)
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