TABLE C.2 ALTITUDE ABSORPTION MEASUREMENTS OVER LAND, FRESH FISSION PRODUCTS All measurements made with Top Hat detector TH-10-A. Altitude Absorption of Radiation ie ft mr/br 3 50 10 6.3 100 4.8 150 200 4.3 3.3 250 300 37 pet mr/hr 708 49 34 pet mr/hr pet 250 — 100 _ 100 _ 100 _ 34 _ —_— — _ 30 23 _ _ _ —_ — ~ —_ _— 2.75 2.35 19 17 —_ 31.7 _ 12.7 _ 15.9 _ 16 350 1.85 13 —_ _ —_ —_ 400 1.7 12 —_ _ _ _ 450 1.52 ii _— _— _ _ 500 1.7 12 21 §50 1.3 600 700 8.4 8.6 9.2 —_ —_ — 1.0 6.2 — —_— —_ _ —_ 13 800 0.76 5.7 —_— 900 _ _ 5.2 —_ 6.9 8.6 _ 4.8 —_— 2.8 4.8 _— 2.7 2.7 * Operation Teapot, 1955, NTS, Shot Turk. t Operation Plumbbob, 1957, NTS. t Operation Plumbbob, 1957, NTS. § 10 mr/hbr, based on single surface reading at 3 feet ALTITUDE ABSORPTION MEASUREMENTS OVER WATER, FRESH FISSION PRODUCTS pet mr/hr pet 50 83 83 _ — 160 72 72 _ —_— 200 300 60 40 60 40 17 _ 52 —_— 400 35 35 15 32 600 20 20 10 800 1,000 10 5 10 5 6.1 —_— 18 10 — * Operation Wigwam, 1955, scintameter TH-3, helicopter. t Operation Wigwam, 1955, Top Hat detector TH-10-A, AD~5N aircraft. 67 a LOTTIE AEMTAI IRRRRT re or meneameovrn omenn> to mr/hr 0)rt ft :.Absorption of Radiation= = Altitude nt TABLE C.3