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A Survey of Surface Back-scatter Factors for Radiations Generated at 200 to 250 kV

St. George's Hospital, London, S.W.1

This excerpt was created in the absence of an abstract.

Surface back-scatter values based on measurements at 16 centres are tabulated for fields up to 400 cm² and H.V.L.'s from 1·0 to 3·5 mm Cu. The measurements, which were made under carefully controlled conditions, agreed at an H.V.L. of 1·5 mm Cu to within ±0·02 of the mean backscatter factors, although seven different types of X-ray generator were used. The effects of applicator end covers on back-scatter factors are investigated.

Accepted for publication January 1, 1954.