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The article describes a study which developed a Monte Carlo-based procedure to examine the shielded fetal doses from external photon beam radiation treatments and improve upon existing techniques discussed in the American Association of Physicists in Medicine (AAPM) Task Group Report 36 (TG-36). The results of the study implies that the absorbed dose averaged over the entire fetal body offers a more accurate estimate than the point-wise measurements in a water phantom recommended in the AAPM TG-36 report.