Uranium contents of phosphate ores and fertilizers collected from El-Sobaeya and El-Suez mines in Egypt were determined by measuring the radon emanated from these samples. In our method, neither direct contact of CR-39 track detectors to the samples nor thermal neutron activation process is required . The concentration of 222Rn in emanation container ( Genitron Instruments GmbH ) is dependent on the Uranium deposited in the phosphate sample. The CR-39 and a pulse ionization chamber, Alpha GUARD PQ-2000 container ( Genitron Instruments GmbH ) were simultaneously used for radon detection .The detection efficiency of CR-39 was calibrated with the Alpha GUARD. The Uranium content determination were performed using a high-resolution inductively coupled plasma mass spectrometer for comparison. The measurements revealed a very high uranium content, 355 ppm for ore and 118 ppm for fertilizer from El-Sobaeya mine. While it was 7 ppm for fertilizer from El-Suez . Although the uranium content of ores from El-Sobaeya mine is within permissible limit for the manufacturing of fertilizers , the phosphate ore from El-Suez is much safer for fertilizers