AREA. OF Naha TISSUE 4. ra ia) cigire La. Photograph and autoradiograph of 100 u sections of lungs from rats collected at Biijiri 9 days after M detonation. (a) Blue Brand X-ray film exposed 49 days; exposure started November 29, 1952. Activity within the lung is diffuse in distribution except for spots from Limited speck contamination. (bv) Super XX film exposed 45 days; exposure started November 22, 1952. Radioactivity within the lung is diffuse except in the bronchus wheres it is more concentrated and irregular in deposition, thus suggesting limited spcck contamination. In areas containing fatty tissus, greater exposure is indicated. Whether tnis is froi che:nleal fogging or from exposure So ridiaticn is mot known. - 715 - mo