الفهرس 
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Abstract
Radon and its dissolved elements is the main contributor to the radiation that humans exposed. Measuring natural sources of radon in indoor places has a big role in protecting human from risks of radon gas In this study, we measured the radon concentration in phosphate rocks, that phosphate is importance in phosphate fertilizers industry which is used in agriculture, that leads to accumulate 238U uranium and 232Th thoron in the soil, which leads to water and soil pollution, thus leads to injury animals with radiation, and then infect people when eating meat or dairy it produces, and heavy elements pile up at the end of the food chain. In this study, we have measured radon concentration, area exhalation rate, mass exhalation rate, radium content, working level, annual absorbed dose and annual effective dose. We collected samples from four regions The first is Safaga, located on the Red Sea coast, 63 km south of Hurghada, the second region is El Hamrawayn which is also located on the Red Sea coast, north of El Qusseir city for about 20 km; the third region is El Sibaiya on the west bank of the River Nile within 30 km north of Edfo, and the fourth region Abu Tartur area which is located in Western Desert 650 km south of Cairo. Ten samples have been taken from each region. The distance between every two samples is about 250 - 500 m in the same region, to measure radon and the rate of emission. We have used the technique (CR-39 and LR-115) detectors. The radon concentration ranged from (6877.68 to 24595.00) Bqm-3, the surface exhalation rate ranged from (6.20 to 22.18) Bqm-2h-1, the average mass exhalation rate ranged from (136.22 to 480.25) Bqkg-1 h-1, the radium content ranged from (16.65 to 68.72) Bqkg-1, the working level ranged from (743.53 to 2658.92), the value annual absorbed dose ranged from (208.21 to 310.24) mSvy-1 and, the annual effective dose, ranged from (208.21 to 744.57) mSvy-1 for Abu Tartur area. The variation differences in the values of radon concentrations due to the in the chemical composition and the geological form of the samples. The values higher than the range of action levels from 200 to 600 Bqm-3 recommended by (ICRP, 1994).The average dose received by the workers of the phosphate mine are 0.15 to 0.29 mSvy-1, which is far below the permitted dose of 20 mSvy-1 recommended by the (ICRP, 1990) We conclude that, the values of radon concentrations in the phosphate are higher than the worldwide limit and not safety for human. The exposure and dose rates exceeded public permissible values in the sedimentary phosphate rocks, so that we must use personal protective masks to protect ourselves from inhalation alpha particles and don’t live near the area under study to minimize the exposure time of radiation. So that we must repeat the measurements to detect the variation in the concentration of radioactive radionuclides that effect in the environment and human.