(a) (b) Fig. 4.9-—Photographs and autoradiograpas of 100-y sections of lungs from rats collected ct Biijiz: nine days after Mike detonation. (a} Blue Brand x-ray film exposed 39 days; exposure started Nov. 29, 1952, Activity within the lung is diffuse in distribution except for spots from limited speck contamination, Magnification 344x. (b) Super XX film exposed 45 days; exposure started Nov. 22, 1952. Radioactivity within the lung is diffuse except in the bronchus, where it is more concentrated and irregular in deposition, thus suggesting limited speck contamination. In areas containing fatty dssue greater exposure is indicated. Whetherthis is from chemical fogging or from exposure to radiation is not known, Magnification, 34%x, 59 "UNCLASSIFIED