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Measurements have been made with a micro ionization chamber, of the back-scatter produced by X-ray beams of less than 10 cm. diameter in the quality range H.V.L.=0·06 mm. Cu to 1·4 mm. Cu. A table of values for back-scatter in a water phantom from these small beams is given. Values for the intermediate beam diameter of 10 cm. are compared with those previously published; and causes of discrepancy are discussed under the headings (1) Phantom material and (2) Radiation cut off by the stem of the measuring ionization chamber.
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D. V. Mabbs (1949) studied this question.
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