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and Toskovic (2002) and as measured by the former US Navy Charleston Naval Shipyard Environmental Monitoring Laboratory (Sam Keith, personal correspondence, FN342). The conclusions that can be reached are that there is no indication that these drywall samples contain phosphogypsum, there is no indication that imported drywall contains any more radioactive material than domestic sources, and drywall associated with these samples would not represent a significant source of radiation exposure.

  • 3.

    Both laboratory analytical approaches are appropriate and valid.

  • 4.

    There were no differences in measured radionuclides between imported and domestic

drywall.

5. Results of these 21 drywall samples may not be representative of all domestic or all imported drywall.

References:

  • 1.

    Rajkovic, M.B. (2002). Investigation of the possibilities of phosphogypsum application for building partitioning walls – elements of a prefabricated house, APTEFF 33, 1-174.

  • 2.

    UNSCEAR 2000 Vol. I, Annex B, Table 5 (http://www.unscear.org/docs/reports/annexb.pdf)

  • 3.

    Kovler, K. (2009). Radiological constraints of using building materials and industrial by-products in construction, Construction and Building Materials 23, 246–253.

  • 4.

    Roessler, C.E. (updated 19 May 2009) (http://hps.org/publicinformation/ate/q25.html)

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