Project 12.2 - Phonex - D. Phillips The phonex experiment as described in OREEWHOUSE Report WT-68 wae performed at two nuclear explosions during Operetion REDWING. “9 At = (BRIE) shot there were two stations (300 yds, and 600 yds. from ground sere) looking through holes in the J-13 shield, Two stations (450 yds end 750 yds.) were eliminated a few days before shot time. The reason fer thie wes the danger of lip scattering by nydrogen in the concrete and pareffin shield as pointed out by Louls Rosen. Te alleviate this situation, the aperture through the shield was reduced using heavy material. In the case of the 300 yd. station, the line of sight passed along a 3" I.D. transite pipe through the shield. Thie pipe was lined with steel tubing 22" long, 2" 1.D., and 3” wall thickness, The lines of sight to the other stations all passed through an opening of rectangnlsr cross section about 8" x 10", Two steel tabes approximetely 30° long, 2/" 1.9., 2" wall were cut and hard soldered tegether in euch a way that one could be placed along the line of aight to the 600 yd. station and the other along the J-13 line. The rest ef the space through the rectangular aperture ws filled by packeing it with about 130 lbs of leac wool, This eliminated the lines of sicht to the 450 yd. and 750 yd. stations. However, it should have materially reduced the number of neutrons scattered through emall angles by hydrogen and them passing along the line to the 300 yd. and 600 yd, etationas. Both etations were heavily sand bagced, particulirly the near etation, At this station, extre shielding in the form of lead wool was placed on top of the collimator and in front of the forward blast plate, BEST AVAILABLE COPY cnetOt pe tts bi