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American Journal of Roentgenology, Vol 97, 939-943, Copyright © 1966 by American Roentgen Ray Society

EXPERIMENTAL DETERMINATION OF THE PULMONARY TISSUE FACTOR IN COBALT 60 TELETHERAPY

ANTERO VOUTILAINEN M.D.1 and SOINI VÄHÄTALO M.A.2

1 Department of Radiotherapy, Professor of Radiotherapy, Turku University
2 Department of Radiotherapy, Assistant Physicist, Helsinki

To determine the pulmonary tissue factor in cobalt 60 teletherapy, the dose of radiation was measured in vivo within the field of radiation by introducing Sievert chambers into the patient's esophagus. At the same time, the dose received as determined from a water phantom at the same depth was also measured. By comparing these results, the tissue factor was calculated. The result obtained agreed with those employing other types of measurements.

It was also found that the doses delivered craniad over the thorax are larger than those delivered caudad, due to the fact that the thoracic thickness decreases craniad. The pulmonary tissue factor also depends on the consistency of the tumor in the lung.


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Copyright © 1966 by the American Roentgen Ray Society.