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July 21, 1969

Dosimetry of Scattered Radiation to the Fetus

Author Affiliations

From the departments of radiation therapy and medical physics, Memorial Hospital for Cancer and Allied Diseases, New York.

JAMA. 1969;209(3):414-415. doi:10.1001/jama.1969.03160160050018

Measurement of scattered radiation to the fetus during radiation therapy for Hodgkin's disease of the mediastinum was 0.0026 rads per rad given to the tumor, or 7.9 rads for 14 treatments or 3,500 rads. Measurements of scattered radiation made on a phantom for three different modalities indicate the scattered dose to a fetus would be 3.5 to 14 rads in early pregnancy, 31 to 49 rads in midpregnancy, and 129 to 248 rads in late pregnancy, for 14 treatments or 3,500 rads.