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SUMMARY:Estimation of Annual Effective Dose and Excess Lifetime Cancer Ris
 k from Background Ionizing Radiation at Udege Mbeki Abandoned Excavated Mi
 ning Site\, Nasarawa State\, Nigeria
DTSTART;VALUE=DATE-TIME:20260522T073000Z
DTEND;VALUE=DATE-TIME:20260522T075500Z
DTSTAMP;VALUE=DATE-TIME:20260624T103003Z
UID:indico-contribution-3807@indico.tlabs.ac.za
DESCRIPTION:Speakers: Michael Adeleye (Bingham University\, Nigeria)\nThis
  study evaluates the radiological health implications of human exposure to
  background ionising radiation (BIR) at the mining site\, with particular 
 emphasis on the Annual Effective Dose Equivalent (AEDE) and Excess Lifetim
 e Cancer Risk (ELCR). Soil samples were collected from four distinct zones
 \; dumps\, farmland\, surface soil and the processing site\, and analyzed 
 using a gamma-ray spectrometer to determine the activity concentrations of
  naturally occurring radionuclides 40K\, 226Ra\, and 232Th. Radiological h
 azard indices\, including absorbed dose rate\, AEDE\, and ELCR were subseq
 uently computed. At the processing site\, mean activity concentrations of 
 40K\, 226Ra\, and 232Th were 218.58 Bq kg⁻¹\, 114.35 Bq kg⁻¹\, and 4
 20.06 Bq kg⁻¹\, respectively. These elevated radionuclide levels result
 ed in a mean absorbed dose rate of 315.66 ± 9.72 nGy h⁻¹\, correspondi
 ng to a mean AEDE of 161.30 ± 4.97 mSv y⁻¹ and a mean ELCR of 564.56 
 × 10⁻³. The highest values were recorded at sample point P7\, with AED
 E and ELCR reaching 387.03 mSv y⁻¹ and 1354.59 × 10⁻³\, respectivel
 y. In the dumps\, mean AEDE and ELCR were 148.81 ± 4.49 mSv y⁻¹ and 52
 0.83 × 10⁻³\, respectively\, while farmland soils showed comparatively
  lower values with mean AEDE of 67.12 ± 2.67 mSv y⁻¹ and ELCR of 234.9
 2 × 10⁻³. Surface soils exhibited intermediate radiological characteri
 stics\, with mean AEDE and ELCR of 121.49 ± 3.48 mSv y⁻¹ and 425.22 ×
  10⁻³\, respectively. Overall\, the estimated AEDE and ELCR values acro
 ss the studied locations exceeded internationally recommended safety limit
 s for public exposure\, indicating significant radiological risk\, particu
 larly within the processing and dump sites. The elevated ELCR values sugge
 st an increased probability of cancer development over a lifetime of expos
 ure. These findings underscore the need for continuous environmental monit
 oring\, restriction of prolonged human activities within high-exposure zon
 es of the mined area to mitigate long-term health risks and enforcement of
  land reclamation agreement to restore excavated mining sites into usable 
 land for agriculture or residential purposes.\n\nhttps://indico.tlabs.ac.z
 a/event/139/contributions/3807/
LOCATION:NRF-iThemba LABS\, Old Faure Road\, Cape Town Auditorium
URL:https://indico.tlabs.ac.za/event/139/contributions/3807/
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