Radon gas inhalation is the second largest cause of lung cancer. This research aims to study the concentration of radon in soil in different locations in Jazan region using the Solid State Nuclear Track Detectors (SSNTD) to investigate the radioactive material in the collected soil samples. The ranges of results are as the follows 869.81 to 302.98 Bq/m~3 for radon concentrations, 27.43 to 9.55 mSv/y for the annual effective dose and 89.03 ±28.51 mBq/m2.h, 5.59 ± 1.79 mBq/Kg. h to 31.01 ± 27.07 mBq/m2.h, 1.95 ± 1.70 mBq/Kg. h for radon exhalation rates. The results show that 87.5% of the annual effective dose of radon in soil were higher than the allowable limits recommended from [1] agency which is (3 -10 mSv/y).
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