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SUMMARY:Measurement of activity concentration of $^{238}$U and $^{232}$Th 
 series radionuclides in beach sand with a multidetector (LaBr$_3$:Ce) gamm
 a-ray spectrometer
DTSTART;VALUE=DATE-TIME:20190319T080000Z
DTEND;VALUE=DATE-TIME:20190319T081500Z
DTSTAMP;VALUE=DATE-TIME:20260812T024102Z
UID:indico-contribution-1313@indico.tlabs.ac.za
DESCRIPTION:Speakers: M. Bashir (Department of Physics Ibrahim Badamasi Ba
 bangida University Lapai/Department of Physics Stellenbosch University/Dep
 artment of Subatomic Physics iThemba LABS)\nThe activity concentrations of
   $^{238}$U and $^{232}$Th series radionuclides in beach sand were measure
 d using a gamma-ray spectrometer comprising four LaBr$_3$:Ce  (2" x 2") de
 tectors without background shielding. The sample was placed 10 cm equidist
 ant from the detectors and counted for 48 hours. This spectrometer allowed
  for measurement in singles and coincidence (gamma-gamma) modes. Time-stam
 ped data were acquired and time correlation used to remove the background 
 offline.\nIn coincidence mode\, the minimum detectable activity (MDAs) wer
 e two orders of  magnitude lower than in singles mode. The weighted activi
 ty concentration of $^{238}$U series radionuclides in singles and coincide
 nce modes are 908 $\\pm$ 70 Bqkg$^{-1}$ and 972 $\\pm$ 99 Bqkg$^{-1}$ resp
 ectively. The weighted activity concentration of $^{232}$Th series radionu
 clides in singles and coincidence modes are 1599 $\\pm$ 70 Bqkg$^{-1}$ and
  1754 $\\pm$ 185 Bqkg$^{-1}$ respectively. Therefore we conclude that the 
 results are consistent to within measurement uncertainty.\n\nhttps://indic
 o.tlabs.ac.za/event/82/contributions/1313/
LOCATION:J Block Auditorium
URL:https://indico.tlabs.ac.za/event/82/contributions/1313/
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