Abstract
In the present work, we have measured the radon gas concentrations in tap water samples are taken directly from drinking tap water in sites houses being carried in Thi-Qar governorate by using nuclear track detector (CR-39). The results of measurements have shown that the highest average radon concentration in water samples is found in AL-Refai region which is equal to (0.223 ± 0.03 Bq/L), while the lowest average radon gas concentration is found in AL-Fajr region which is equal to (0.108 ± 0.01 Bq/L), with an average value of (0.175 ± 0.03 Bq/L). The highest value of annual effective dose (AED) in tap water samples is found in AL-Refai region, which is equal to (0.814 μSv/y), while the lowest value of (AED) is found in AL-Fajr region which is equal to (0.394 μSv/y), with an average value of (0.640 ± 0.1 μSv/y). The present results have shown that radon gas concentrations in tap water samples are less than the recommended international value (11.1 Bq/L). There for tap water in all the studied sites in Thi-Qar governorate is safe as for as radon concentration being concerned.
Highlights
Radon (222Rn) is a radioactive gas with a half- life (3.825 d)
The aim of the present work is to determine the radon gas concentration in tap water samples for selected regions sites in Thi-Qar governorate by using alpha-emitters registrations which are emitted from radon gas in (CR-39) nuclear track detector
It can be noticed that, the highest average radon concentrations in tap water samples was found T1 (AL-Refai) region which was equal to (0.223 ± 0.03 Bq/L), while the lowest average radon concentration was found in T4 (AL-Fajr) region which was equal to (0.108 ± 0.01 Bq/L), with an average value of (0.175 ± 0.03 Bq/L), see Figure 4
Summary
Radon (222Rn) is a radioactive gas with a half- life (3.825 d). It is produced by the decay of naturally occurring radionuclide (226Ra), which is in turn a decay product in the uranium (238U) series. Thoron gas (220Rn), which is a radon isotope, is a decay product in the thorium (232Th) series. The half-life of thoron (56.6 s) which is much shorter than that of radon. When radon is inhaled into the lungs, it decays by means of alpha-emission which causes ionization damage when it strikes the lung tissue. Over time, this damage causes lung cancer [1]
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