Assessment of ¹³⁷Cs and ²³⁹,²⁴⁰Pu Distribution in Forest Soils of the Opole Anomaly
2010
Ziembik, Zbigniew | Dołhańczuk-Śródka, Agnieszka | Komosa, Andrzej | Orzeł, Jolanta | Wacławek, Maria
Distribution of ¹³⁷Cs and ²³⁹,²⁴⁰Pu in the forest soils horizons of the Opole Anomaly was established. Gamma and alpha spectrometry was used for determination of these isotopes. It was found that the ¹³⁷Cs activity was approx. 1,000 times higher than that of ²³⁹,²⁴⁰Pu. The highest activities of both radioisotopes were found close to the boundary region in soil profile where the organic horizon turns into the inorganic one. Cluster analysis did not clearly indicate the group's existence in data in respect to ¹³⁷Cs and ²³⁹,²⁴⁰Pu activities and organic matter content. Distributions of ¹³⁷Cs and ²³⁹,²⁴⁰Pu in soil horizons were non-normal but similar to each other. These distributions were substantially different from that one for organic matter content. The data were separated into two groups, for organic and inorganic soil horizons, respectively. Data transformation using Box-Cox formula was performed following by standardization. Mutual relationships between variables were investigated using ordinary and robust regression methods. Good correlation between ¹³⁷Cs and ²³⁹,²⁴⁰Pu was found. No significant relationship between organic matter content and radioisotopes activity was asserted.
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