Skyshine Contribution to Gamma Ray Background Between 0 and 4 MeV

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Natural gamma-ray background is composed of four components; which include cosmic rays, cosmic ray produced atmospheric activity, terrestrial sources, and skyshine from terrestrial sources. Skyshine is radiation scattered from the air above a source that can produce a signal in radiation detection instrumentation. Skyshine has been studied for many years but its contribution to the natural background observed in a detector has not been studied. A large NaI(Tl) detector was used to investigate each of the four components of the natural background using a series of 48-hour measurements and appropriate lead shielding configured to discriminate contributions from each component. It ... continued below

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Mitchell, Allison L.; Borgardt, James D. & Kouzes, Richard T. August 14, 2009.

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Natural gamma-ray background is composed of four components; which include cosmic rays, cosmic ray produced atmospheric activity, terrestrial sources, and skyshine from terrestrial sources. Skyshine is radiation scattered from the air above a source that can produce a signal in radiation detection instrumentation. Skyshine has been studied for many years but its contribution to the natural background observed in a detector has not been studied. A large NaI(Tl) detector was used to investigate each of the four components of the natural background using a series of 48-hour measurements and appropriate lead shielding configured to discriminate contributions from each component. It was found that while the contribution from skyshine decreases rapidly with energy, it represents a significant portion of the background spectrum below ~500keV. A similar campaign of measurements using a HPGe detector is underway.

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  • Report No.: PNNL-18666
  • Grant Number: AC05-76RL01830
  • DOI: 10.2172/990599 | External Link
  • Office of Scientific & Technical Information Report Number: 990599
  • Archival Resource Key: ark:/67531/metadc1012246

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  • August 14, 2009

Added to The UNT Digital Library

  • Oct. 14, 2017, 8:36 a.m.

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  • Oct. 23, 2017, 8:44 p.m.

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Mitchell, Allison L.; Borgardt, James D. & Kouzes, Richard T. Skyshine Contribution to Gamma Ray Background Between 0 and 4 MeV, report, August 14, 2009; Richland, Washington. (digital.library.unt.edu/ark:/67531/metadc1012246/: accessed October 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.