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Risk Assessment of Radon in Drinking Water (1999) / Chapter Skim
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E Gamma Radiation Dose from Granular-Activated Carbon (GAC) Water Treatment Units
Pages 257-259

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From page 257...
... , was used to compute gamma ray exposure rates at locations outside a volume containing radioactivity with a specified distribution of radioisotopes. The program accounts for both the source-receptor geometry and the attenuation of the gamma rays by the materials within the tank (such as water and carbon)
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From page 258...
... By specifying that the radiation source is Rn-222, the MICRO-SHIELD program computes the source strength for the various radon decay products, assuming that they are in equilibrium with the radon in the carbon bed. Sufficient time was allowed to elapse to permit the radon decay products to reach equilibrium with the radon.
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From page 259...
... However, for the two examples of the high-flow case, the resulting dose rates are about the same. Finally, calculations were also done with the CARBDOSE model (Rydell and Keene, 1993)
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Key Terms

  • water treatment
  • flow rates
  • dose rate
  • dose rates
  • estimated equivalent

  • absorbed dose
  • decay products
  • radon decay
  • water flow
  • using gac

  • tank operating
  • extended radioactive
  • radioactive source
  • resulting absorbed
  • tank designed

  • volume containing
  • tank dimensions
  • treatment tank
  • radioactive materials
  • treatment plants

  • dose calculation
  • engineering company
  • containing radioactivity
  • exposure rates
  • treatment plant

  • compute gamma
  • various radon
  • estimated dose
  • pressurized treatment
  • specified distribution


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