ABSTRACT
Radon is one of the sources of nuclear contamination in water and the largest contributor of the total radiation received by the general public from natural radioactive sources. Human exposure to high doses of radon through inhalation as gas or ingestion in water can lead to cancer. In this present work, the activity concentrations of Radon-222 (222 Rn) were investigated from fifteen (15) water samples collected at different locations within Dutsin-Ma town, Dutsin-Ma Local Government Area, Katsina State using
Liquid Scintillation Counter. The concentrations of Radon were found to range from (11.67-152.81⁄), (0.61-172.25⁄) and (21.98-47.17⁄) with mean values of 64.66⁄, 41.15⁄and 34.57⁄for Borehole, open well and Earth-Dam respectively. The results were
compared with the world average maximum contaminant level (MCL) of 10⁄set by World Health Organization and it was noted that 86.67% of the samples exceeded the value with 20% of the samples above the World recommended reference level of 100/. Also, the Annual Effective Doses due to ingestion of Radon in water for the three (3) categories of people were estimated from the measured radon concentrations and their mean values were found to be (0.472, 0.944, 3.304)/ in borehole water, (0.308, 0.616, 2.156)/ in well water and (0.252, 0.504, 1.764)/in surface water (Earth-Dam) for adults, children and infants respectively. All the mean values of the annual effective doses were above the recommended level of 0.1/set by World Health Organization as such it is recommended that the inhabitant of Dutsin-Ma town should always boil their water irrespective of it source before drinking so as to keep the concentration of Radon as low as reasonably achievable. Beside, further studies on the activity concentration of radon in water sources from Dutsin-Ma environs and other parts of Katsina State be carried out so as to determine the fitness of the water for consumption or otherwise.
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