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SUMMARY:GEANT4 MONTE-CARLO SIMULATION AND MEASUREMENT OF GAMMA RAY ATTENUA
 TION IN CONCRETE
DTSTART;VALUE=DATE-TIME:20220322T153000Z
DTEND;VALUE=DATE-TIME:20220322T154500Z
DTSTAMP;VALUE=DATE-TIME:20260411T022347Z
UID:indico-contribution-2256@indico.tlabs.ac.za
DESCRIPTION:Speakers: JOSHUA PONDO (KENYATTA UNIVERSITY)\nGamma rays have 
 high energy hence they are significantly used in irradiation of food items
 \, diagnosis in nuclear medicine\, tracing for radioactive substances like
  thorium\, radiotherapy\, sterilization of medical equipment\, and among o
 thers\, the detection of illicit trafficking of radioactive material acros
 s international borders. However\, gamma rays also pose great danger to in
 dividuals working within and around radiation facilities including the lin
 ear accelerators used in medicine\, nuclear power stations and the nuclear
  reactors. This is because when gamma rays is absorbed by living organisms
 \, it damages their cells causing delayed division\, reproductive failure 
 and mutation among others. This calls for radiation protection for people 
 working near radiation facilities. The study on gamma radiation attenuatio
 n through materials is important in Gamma ray shielding hence radiation pr
 otection. Most radiation facilities have thick concrete walls. This is bec
 ause it’s a cheap shielding material with good structural advantage. Thi
 s study employed the use of the GEANT4 Monte-Carlo program to simulate the
  gamma ray attenuation in concrete. Version ten of the GEANT4 package for 
 Linux platform was used to simulate the linear attenuation coefficient of 
 ordinary concrete for gamma ray photons of energy 662 keV and its mass att
 enuation coefficient for gamma ray photons within the energy range from 10
  keV to 100 MeV. The simulated and the measured data were analyzed with th
 e ROOT program. A comparison was made between the GEANT4 simulated results
 \, the measured data\, the NIST XCOM simulated data and the published data
 . The findings from measurement indicated that the linear attenuation coef
 ficient of ordinary concrete is (0.182±0.006) cm-1 while the GEANT4 simul
 ated value is 0.179 cm-1. The half value layer of ordinary concrete was ob
 tained to be (3.81±0.13) cm and 3.87 cm for the measurement and the GEANT
 4 simulation respectively. These research findings also showed that the me
 an free path of ordinary concrete is 5.59 cm and (5.49±0.18) cm for the s
 imulation and the measurement respectively. The variation of mass attenuat
 ion coefficient with energy from 10 keV to 100 MeV obtained from GEANT4 wa
 s consistent with the one obtained from XCOM program\, except at lower ene
 rgies where the photoelectric effect mass attenuation coefficient was inco
 nsistent. This was attributed to the adoption of different cross section d
 ata sources for the XCOM program and the GEANT4 program. These findings in
 dicated consistency in both the measured results\, the GEANT4 evaluated re
 sults\, the XCOM simulated results and the published data. The results val
 idated the use of the GEANT4 program for the simulation of gamma ray atten
 uation in materials.\n\nhttps://indico.tlabs.ac.za/event/109/contributions
 /2256/
LOCATION:
URL:https://indico.tlabs.ac.za/event/109/contributions/2256/
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