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Radiation Protection Dosimetry Advance Access originally published online on June 6, 2006
Radiation Protection Dosimetry 2006 120(1-4):273-277; doi:10.1093/rpd/nci681
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Published by Oxford University Press (2006)

Technical aspects of the Naval Dosimetry Center quality assurance programme

T. J. St John1,*, J. R. Cassata2, P. K. Blake3, W. H. Wallace1 and R. Minniti4

1 The US Naval Dosimetry Center, Bethesda, MD, USA
2 Portsmouth Naval Shipyard, Portsmouth, NH, USA
3 Uniformed Services University of the Health Sciences, Bethesda, MD, USA
4 National Institute of Standards and Technology, Gaithersburg, MD, USA

* Corresponding author: tstjohn{at}navdoscen.med.navy.milI am a [United States] military service member. This work was prepared as part of my official duties. Title 17 U.S.C. 105 provides that 'Copyright protection under this title is not available for any work of the United States Government.' Title 17 U.S.C. 101 defines a United States Government work as a work prepared by a military service member or employee of the United States Government as part of that person's official duties.

The purpose of this paper is to describe the technical aspects of the Naval Dosimetry Center (NDC) quality programme. The Navy has been formally monitoring personnel for occupational exposure to ionising radiation since at least 1946. The current system, the DT-702/PD, is the Harshaw 8840 holder and 8841 card. New card and holder checks are performed to verify that the correct LiF elements and holder filters are in the correct location and are of the correct composition. Element correction coefficient (ECC) magnitude and repeatability are also verified. Several quality assurance parameters are checked by a specially designed shipping machine. Calibration cards are used to calibrate each reader and quality control cards are inserted throughout a group of field cards to verify reader operation during the read process. The success of the programme is measured by annual proficiency tests administered by the National Voluntary Laboratory Accreditation Programme and Pacific Northwest National Laboratories.


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