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SUMMARY:The investigation of natural radionuclides as tracers for monitori
 ng sediment processes
DTSTART;VALUE=DATE-TIME:20210914T091500Z
DTEND;VALUE=DATE-TIME:20210914T094500Z
DTSTAMP;VALUE=DATE-TIME:20260719T090810Z
UID:indico-contribution-339-1597@indico.tlabs.ac.za
DESCRIPTION:Speakers: Jacques Bezuidenhout ()\nIn situ and sampling measur
 ements of naturally occurring radionuclides were investigated in terrestri
 al sediment in various environments. These environments include beaches\, 
 wetlands\, river basins\, and deserts that are within Southern Africa. The
  distribution patterns of the natural radionuclides were extracted and cha
 racteristics were compared and investigated. These characteristics were us
 ed to develop a method that can radio fingerprint types of sediment. The f
 ingerprinting can then be used as a tracer to track sediment movement in a
 quatic systems when artificial disturbances\, like dredging\, occur.\n\nht
 tps://indico.tlabs.ac.za/event/92/contributions/1597/
LOCATION:Zoom Online
URL:https://indico.tlabs.ac.za/event/92/contributions/1597/
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SUMMARY:Soil-to-plant transfer factors and radiological risk assessment (M
 onte Carlo simulation) of selected mining sites in Nigeria.
DTSTART;VALUE=DATE-TIME:20210914T094500Z
DTEND;VALUE=DATE-TIME:20210914T100000Z
DTSTAMP;VALUE=DATE-TIME:20260719T090810Z
UID:indico-contribution-339-2034@indico.tlabs.ac.za
DESCRIPTION:Speakers: Muyiwa Michael Orosun (Department of Physics\, Coven
 ant University\, Ota\, Ogun State\, Nigeria)\nOne of the major route throu
 gh which human are exposed to ionizing radiation is via food chain\, which
  is consequent of soil-to-plant transfer of radionuclides. This work repor
 ted the activity concentrations of 40K\, 238U and 232Th in samples of wate
 r\, soil and guinea-corn collected from Beryllium and Gold mining sites in
  Kwara\, Nigeria. In-situ measurements at approximately 1 m in the air was
  carried out using a well-calibrated portable Gamma Spectrometer (Super-Sp
 ec RS-125)\, while the collected samples were analyzed using a ‘3 x 3’
  inch lead-shielded NaI (Tl) detector. The measured activities in the soil
  from both mines are lower than the in-situ measurements. This was attribu
 ted to the contribution from other terrestrial materials on-site. The esti
 mated mean transfer factors (TFs) for 40K\, 238U and 232Th are 0.21\, 0.17
  and 0.31\, and 0.46\, 0.19 and 0.28 respectively for the Beryllium and Go
 ld mining sites. While the TFs for 238U and 232Th exceeds the mean value o
 f 0.0062 and 0.0021 for 238U and 232Th respectively\, the TFs for 40K are 
 well below the 0.74 for grains provided by IAEA. The radiation impact asse
 ssment using the Monte Carlo simulations reveals values that were generall
 y within the limits recommended by UNSCEAR. \nKeywords: Cancer\, Radioacti
 vity\, Gamma Spectroscopy\, Risk Assessment\, Monte Carlo\n\nhttps://indic
 o.tlabs.ac.za/event/92/contributions/2034/
LOCATION:Zoom Online
URL:https://indico.tlabs.ac.za/event/92/contributions/2034/
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