‘ Table 3.1 Second Vertical G.M.C. Profile in Yankee Fallout Station Y -1 Lat: 1600 May 6, 1954 12° lo'n Depth (meters)*** r Long: 266° 06' E Microamperes Reading In Situ Intensity 1.0 23.5 24.0 6.8 16.5 16.8 6 24.0 16,8 42.7 48.7 23.5 23.5 16.5 16.5 54.8 57.9 20.5 19.5 13.9 13.2 2.0 6.0 Hydro bucket * Surface** 3.05 6.1 - 33.6 (mr/nr) 24.0 39.6 16.8 23.5 51.8 16.5 20.0 61.0 64.0 68.0 13.5 18.0 16.0 12.5 12.0 210.5 7.9 3.5 3.5 3.0 2.1 2.1 1.6 75.0 78.0 81.0 3.6 * G.M.C. on grilled floor of hydro bucket 6 ft above sea. *## ~All depths measured by meter wheel on hydro wire. # Note: G.M.C. just submerged in sea. The first vertical cast is not tabulated since depth measurements are questionable. Readings made after every 10 ft of line paid out, instrument wes allowed to adjust itself at each depth. Maximum depth Average intensity Decay factor Therefore at 3 feet elevation and = i, = = Oy 12 8 4.4 wr/br VEO 7 Ad 8,03 R/br 19.59 R/br Table 3.2 Third Vertical G.M.C. Profile in Yankee Fallout Station Y ~ 2 Lat: 1900 May 6, 1954 11° 55,3' N Depth (meters) *#** Long: Microamperes (Reading) Hydro bucket * Surface ** 5 10, 20, 30, & 40 45 50 55 60 166° 16.6" E In Situ Intensity 9.0 17.5 17.5 5.4 n.7 11.7 17.0 11.2 17.5 17.0 17.0 11.7 11.2 2 16.5 65 75 go Lying on deck*###* 10.4 14.0 9.0 10.5 4.5 7.0 6.6 2.7 4.2 Instrument on grid of hydro bucket about 6 f% above sea. Just submerged. Depths read on mater wheel of hydro wire. on te RHE | 10.8 16.0 70 (mr/hr) Instrument lying on ship's contaminated deck; the ship's hull shields sea radiation. Maximum depth Average intensity At 3 ft elevation Decay factor Therefore 02 = 16.87 r/br 33 Z= 75 PR 10.55 mrfhr @= 6.49 x/hr = 2.6