Proposals for revised factors in intra-oral radiography shielding calculations

M. Worrall, S. McVey, D. G. Sutton

    Research output: Contribution to journalArticle

    2 Citations (Scopus)

    Abstract

    The current value for weighted average primary plus scatter kerma at 1m for intra-oral radiography shielding assessment is based on scatter radiation measurements made with the trunk of a RANDO phantom and an assessment of primary transmission that is unverified. Measurements of primary transmission and scatter radiation during intra-oral radiography were made at 30° intervals through a full 360° rotation using two anthropomorphic head phantoms and similar equipment at three different sites. The results suggest that a scatter factor of 5Gy(Gycm ) and a primary transmission of 0.03% of the entrance surface dose are more appropriate and, therefore, we recommend that the weighted average primary plus scatter kerma used for shielding calculations can be reduced from 1 to 0.5Gy per exposure at 1m. This factor will adequately account for exposures made at 60 and 70kV using a range of intra-oral units.
    Original languageEnglish
    Pages (from-to)243-249
    Number of pages7
    JournalJournal of Radiological Protection
    Volume32
    Issue number3
    DOIs
    Publication statusPublished - 2012

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