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 the 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 ( ...