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The contents of natural radionuclides (radium, uranium and potassium) were measured in the area of a phosphate fertilizer factory in central Croatia, as a part of extended and still ongoing monitoring program of radioactive contamination of human environment in Croatia that is performed by the Radiation Protection Unit of the Institute for Medical Research and Occupational Health in Zagreb. Activity concentrations in all analysed media (waste water, trickling water from piezometers, phosphogypsum deposit and final products) considerably fluctuated, especially in phosphogypsum and waste water. Mean ²²⁶Ra activity concentration in waste phosphogypsum was measured to be 483±190Bqkg⁻¹. Based on that value, it was estimated that 4millionm³ of phosphogypsum that have been deposited up to now contain about 4.3×10¹²Bq, i.e. about 200g of ²²⁶Ra. However, effective dose for an adult that would be …