4 EVENT AND DESCRIPTION OF EXPOSED GROUPS l] SID Tarra base Seewey —T 500 Teton we enn eee e ee en nue ee on a 1000¢r Depth Dose in Phantom Mon —s- initial Radiation --X--- Residual Field dee PERCENT OF 3.0 CM DOS E 200 SOr 20+ 'y—+— I 20 OEPTH IN (CM) 1 _L 30 Fioure 1.5-—Compurison of depth dose curves in a masonite phantom man, of the initial atamic bomb gamma radiation and of yamma radiation from a planar field of fasion products deposited on soil after an experimental nuclear detonation. the atolls, and spectrometric and radiochemical data. The actual duration of the radioactive fallouts was not known, and the values for length of exposure were subject to uncertainties in the times at which the fallouts began. A range of possible whole body gamma doses was calculated, and the values considered to be most probable are presented. Ditfuse geometry from the semi-infinite planar source was believed to increuse the biological effect of the whole body dose expressed as an air dose, compared in the geometry of the usual X-ray exposure. Soft gamma and beta radiation from fallout on the ground and especially on the skin itself resulted inv superficial dose which was high enough to produce lesions. No quan-