RADIOLOGICAL IMPACT ASSESSMENT OF NATURAL RADIOACTIVITY OF CERAMIC WARES AND DECORATIONS IN ABEOKUTA, NIGERIA
Keywords:
Abeokuta, Gamma ray spectrometry, Health hazard, Ceramic Tablewares, Natural radioactivityAbstract
Gamma ray spectrometry was carried out on twenty different ceramic tableware and flower vases procured from the local market in Abeokuta, using Sodium iodide detector to assess their natural radioactivities and ascertain likelihood of health hazards. The range of radioactivity of the ceramic samples for K–40 is 190.34 ± 12.419 to 2364.56 ± 128.9Bq/kg, for U–238 it is BDL to 108.34 ± 14.81Bq/kg and for Th–232 it is BDL to 8.33 ± 1.3Bq/kg. The mean specific activity for all the samples for K–40 is 1355.97 ± 71.28Bq/kg, for U-238 it is 39.49 ± 5.41Bq/kg and for Th–232 it is 3.94.± 0.46Bq/kg . The range of Radiumequivalent forth samples is 81.64 to 222.99 Bq/kg with mean of 149.53 ± 11.56Bq/Kg.The gamma indices were all less than unity, while the absorbed dose rates of mean value 77.17 ± 5.75 nGy/h as well as annual effective doses of mean value 0.38 ± 0.03 mSv/yr were below the standard maximum safety limit for all building materials and indoor radiation as recommended by World Health Organization (WHO) and International Atomic Energy Agency (IAEA), hence they are safe for human use.
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