Proposals for revised factors in intra-oral radiography shielding calculations

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

doi:10.1088/0952-4746/32/3/243

Proposals for revised factors in intra-oral radiography shielding calculations

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

Research output: Contribution to journal › Article › peer-review

3 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 language	English
Pages (from-to)	243-249
Number of pages	7
Journal	Journal of Radiological Protection
Volume	32
Issue number	3
DOIs	https://doi.org/10.1088/0952-4746/32/3/243
Publication status	Published - 2012

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10.1088/0952-4746/32/3/243

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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.",

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AU - Worrall, M.

AU - McVey, S.

AU - Sutton, D. G.

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N2 - 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.

AB - 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.

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Proposals for revised factors in intra-oral radiography shielding calculations

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