° FSi 99 The desirability of aircraft pressurization filters seemed somewhat enhanced when considering the penetration of atomic clouds of this type and magnitude, especially if the cloud was generated from a surface detonation. From observing the personnel burns occurring on the downwind ia- lands and on board naval vessels of the Task Force, it was apparent that superficial burns due to beta radiation could be produced from unconcentrated fission products in the fall-out. The concentration of fission products in an unfiltered aircraft following a cloud penetration was not measured under the BRAVO conditions, but was considered worth including in future test planning. The skin burns as seen were not disabling but ; " t were certainly undesirable. It was reported by Program 4.0 that as of H plus thirty-nine days there was no factor present in the blood pictures to indicate any evidence of chronic or internal radiation effects. Finally, there was still a psychological factor to be considered when dealing with Department of Defense personnel. The natives were un- concerned and carefree about the whole affair, but U. 3. personnel were shaken by their experiences, Apparently, they were well educated to the dangers of contamination, but not to the actual effects. AFWL/HO . ae /b6