Abstract
The radon gas concentration in environmental samples soil and water of selected regions in Al-Najaf governorate was measured by using alpha-emitters registrations which are emitted form radon gas in (CR-39) nuclear track detector. The first part is concerned with the determination of radon gas concentration in soil samples, results of measurements indicate that the highest average radon concentration in soil samples was found in (Al-Moalmen) region which was (100.0±7.0 Bq/m3), while the lowest average radon concentration was found in (Al-Askary) region which was (38.5±4.7 Bq/m3), with an average value of (64.23±14.9 Bq/m3) ,the results show that the radon gas concentrations in soil is below the allowed limit from (ICRP) agency which is (200 Bq/m3), while the radon exhalation rate (RER) ranged from (35.23-91.52 µBq/m2h), and average value which was (58.77±13.6 µBq/m2h). The second part is concerned with the determination of radon gas concentration in samples of tap water obtained from networks in dwellings in Al-Najaf governorate, the results indicate that the highest average radon concentration in water samples was found in (Meassan) region which was (0.59±0.08 Bq/L), while the lowest average radon concentration was found in (Al-Jamhorah) region which was (0.16±0.04 Bq/L), with an average value of (0.36±0.1 Bq/L), the present results show that the radon gas concentrations in tap water is below the allowed limit from (ICRP) agency which is (0.5994 Bq/L), while the radon exhalation rate (RER) ranged from (2.15-0.58 ?Sv/y), and average value which was (1.28±0.31 ?Sv/y).
Highlights
Gaseous radioactive radon (222Rn), decay product of the radium isotope 226Ra presents in all types of soil and rock
From Table (1) it can be noticed that, the highest average radon concentration in soil samples was found in (AlMoalmen) region which was (100.0±7.0 Bq/m3), while the lowest average radon concentration was found in (Al-Askary) region which was (38.5±4.7 Bq/m3), see fig. (5), with an average value of (64.23±14.9 Bq/m3), the present results show that the radon gas concentration in soil is below the allowed limit from (International Commission of Radiation Protection) (ICRP) agency which is (200 Bq/m3) [11], while the radon exhalation rate (RER) ranged from (35.23-91.52 μBq/m2h), and average value which was (58.77±13.6 μBq/m2h)
The second part is concerned with determination of radon gas concentration in samples of tap water obtained from networks in dwellings in Al-Najaf governorate, from Table (2), it can be noticed that, the highest average radon concentration in water samples was found in (Meassan) region which was (0.59±0.08 Bq/L), while the lowest average radon concentration was found in (AlJamhorah) region which was (0.16±0.04 Bq/L), see Fig. (6), with an average value of (0.36±0.1 Bq/L), the present results show that the radon gas concentration in tap water is below the allowed limit from (International Commission of Radiation Protection) (ICRP) agency which is (0.5994 Bq/L)
Summary
Gaseous radioactive radon (222Rn), decay product of the radium isotope 226Ra presents in all types of soil and rock. Radium atoms decays in soil particles, the resulting atoms of radon entering to air filled pores and transported by diffusion and advection through this space in order to exhale into the atmosphere [1]. Some radon stays in the tap water containing radon presents a risk of developing internal organ cancers, primarily stomach cancer [4]. This risk is smaller than the risk of developing lung cancer from radon released to air from water. The aim of the present work is to determine the radon gas concentration in soil surface and tap water samples in selected regions in AL-Najaf governorate by using alpha-emitters registrations which are emitted form radon gas in (CR-39) nuclear track detector by using the sealed-cup technique
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