of the barracks be washed away but also particles falling onto the asphalt apron near the building, Photographs of the installed systems are shown in Figure A. 1. Barracks 101 was designated as a control building for this study and was not provided with a washdown system. Both barracks were to be provided with a continuous background monitor, In the event of a fallout Rad-Safe personnel were to place film badges at 129 identical locations inside of each building, so that the radiation dosages received at all interior points could be computed, Fallout trays would be placed around each of the buildings and samples would be collected and analyzed daily. Immediately upon determining that the fallout had ceased, a complete radiological survey would be made inside and outside the two buildings, Results of the survey would be compared and the efficiency of the wash- down system for reducing the dose rate would be computed, Also, the dosages received by the film badges in the two buildings would be compared, and the efficiency of the washdown system could be determined. 36