Interpretation of the Sources of Radioactive Elements and Relationship between them by Using Multivariate Analyses in Anzali Wetland Area
The Anzali Wetland complex (37°23΄ to 37°37΄ E _ 49°19΄ to 49°35΄ N), is situated on the southwest shore of the Caspian Sea adjacent to Bandar-e-Anzali town on the northern boundary in Gilan province, northern Iran. The average radionuclide values for the 33 sampled points (26 deposit samples and 7 soil samples) were 24.66 Bq Kg-1 for Ra-226, 31.94 Bq Kg-1 for Th-232, 459.98 Bq Kg-1 for K-40, 3.72 Bq Kg-1 for U-235, and 11.66 Bq Kg-1 for Cs-137. Environmental problems (tourist zone sea-beach), agriculture waste (fertilizers, pesticides, herbicides especially from rice-fields), polluted rivers(10 biggest rivers) and industrial wastewater (30 main polluted factories) cause an anomaly in area. Correspondence analysis, principal component analysis (PCA) and cluster analysis applied to the data matrix to evaluate analytical results. According to this methods, three category of elements is recognized: (1) Th-232, Ra-226 and K-40; (2) Cs-137; (3) U-235. About 10 tributary rivers flow into Anzali Wetland Complex and cause a total precipitation near to 1500 -2000 mm / year. This fact implies that there exists a high rate of changes in this area, and many factors and characters must contribute or influenced in Interpretation and analyses.