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Hochhaeuser, E. ; Balk, O.A.

Tissue-air ratios for whole body irradiation with cobalt 60 gamma rays.

Br. J. Radiol. 51, 460-462 (1978)

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Open Access Green möglich sobald Postprint bei der ZB eingereicht worden ist.

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Total body irradiation with ⁶⁰Co γ rays has been used since about 1966 for the treatment of acute leukaemia (Johnson, 1968; Buckner et al., 1970; Thomas et al., 1971; Miller et al., 1976). The method of irradiation developed by the Seattle group (Thomas et al., 1975) requires knowledge of the dose at the mid-line of the body for calculation of the treatment time. Published data of tissue-air ratios (TAR) for elongated fields like the dimensions of a human body in the lying position are not available. It is only known from measurements carried out by Faw and Glenn (1972) that the TAR values along the central axis of the beam for square fields greater than 50 × 50 cm² show an effect of saturation. The objective of our investigations was to find TAR values for the mid-line of a human body. An Alderson phantom with a length of 150 cm, a mean lateral diameter of 30 cm and a mean A.P. diameter of 21 cm was used. The irradiation was carried out in a lateral direction with a field size of 165 × 30 cm², the centre of the beam being coincident with the diameter below the umbilicus. The source-mid-line distance was 4 m, which gives a decrease in air-dose of less than 4% at the ends of the phantom.

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