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Radioactivity in some sachet drinking water samples produced in Nigeria
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O.S. Ajayi   , G. Adesida |
| , ajayisam1089@yahoo.com |
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Abstract: (19942 Views) |
| Background: Activity concentrations of 40K,
226Ra and 228Ra were measured in some sachet
drinking water samples produced in Nigeria.
Materials and Methods: The measurement was done
by using high-purity germanium (HPGe) detector
(Canberra Industries Inc.). The measured activity
concentrations for 226Ra (U-series) and 228Ra (Thseries)
were used with their ingested dose conversion
factors to estimate annual effective doses for the
International Commission on Radiological Protection
(ICRP) age groups 0 – 1y, 1 – 2y, 2 – 7y, 7 – 12y, 12
– 17y and >17y from consumption of the water
samples. Results: Measured activity concentration
values varied from 0.57±0.21 to 34.08±5.61 Bq l-1,
2.22±0.97 to 15.50±4.51 Bq l-1 and 0.04±0.01 to
7.04±1.16 Bq l-1 for the radionuclides respectively.
Estimated total annual effective doses varied from
4.73 to 49.13, 1.21 to 12.26, 0.86 to 8.54, 1.22 to
11.66, 3.40 to 28.98 and 0.68 to 5.04 mSv y-1 for
the age groups respectively. The highest total annual
effective dose was found in Tisco sample while the
lowest was found in Focar sample. Conclusion: The
total annual effective dose in all samples considerably
exceeded the average worldwide ingestion
exposure dose value of 0.12 mSv y-1 from uranium
and thorium series reported by the United Nations
Scientific Committee on Effects of Atomic Radiations
(UNSCEAR). Therefore the Nigeria populace is advised
to consume less of these water samples. Iran. J.
Radiat. Res., 2009 7 (3): 151-158 |
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| Keywords: Natural radioactivity, sachet water, effective dose, water quality parameter, ingested dose conversion factors. |
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Full-Text [PDF 482 kb]
(4544 Downloads)
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Type of Study: Short Report |
Subject:
Radiation Biology
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