@ wee ee. SIMULATED HOUSE EXPERTMENIGD 1 1 A simple experiment was conducted on Bikini Island to assess the potential exposure rate effect and reduction by concrete living quarters made from ek . fen @ . @ aggregate obtained from the PETER-OBOE complex. A concrete house was simulated by constructing a large square container with hollow walls six inches thick. The walls and the bottom six inches were eventually filled with aggregate (obtained from the PETER-OBOE complex) after the container was placed in an area of relatively high exposure rate (125 uR/hr). A compartment was located in the center of the structure in which a Ludlum scintillation survey meter was placed to measure exposure rates without aggregate, with six inches of aggregate on bottom, and with ‘ walls of aggregate. Results of this experiment are as follows: Background 125 uR/hr Six inch aggregate bottom 75 uR/hr Six inch aggregate bottom 45 uR/hr plus six inch walls Similar results were seen when exposure rates wore measured inside : outside of a drained concrete cistern in the camp area, and which was constructed with wien 7°