Order number page 16 940406-171827 set 5 with LOFFICIAEGSEONLY of radioactive materials. The field data were collected by seven specialists who collected plankton, algae, rats, birds, fish, plants, and invertebrate organisms from October 20 to November 11, 1952. The material collected was frozen for storage and shipment back to the Applied Fisheries Laboratory, where it was identified, dissected, weighed, 801. KEYWORD(S) ashed, and measured for radiation in disintegrations per minute per gram of wet sample. The pretest survey showed measurable amounts of residual radiation on and in the living organisms collected from the stations along the eastern and northern portion of the Atoll. Following Mike shot the radiation level increased many-fold, especially along the northern and western portions of the Atoll. The amount of radiation found on and in the specimens was sufficient to destroy or damage these forms over a very wide area. Subsequent studies should determine the biological half life of the materials contaminating the area, their shift in position with the currents, and the results of the contamination from radioactive materials upon the living forms of the Atoll. ANIMALS/biological radiation effects ;MIKE BURST/residual radiation ;RESIDUAL RADIATION/measurement ; ENIWETOK/residual radiation ;ANIMALS; IVY;MEASUREMENT; PLANTS Item 27 150. 110. 70. 710. 371. REPORT NUMBER PRIMARY TITLE (M) USAF /OA/WP--25 Generalized study of the effects explosions on aircraft in flight. Working Paper PERSONAL AUTHOR (M) Rethorst, PUB. 510718 CORPORATE SOURCE DATE (YYMMDD) S.; Sandborn, R.T. Department of the Air Force, of A-bomb Operation Analysis Washington, DC (USA) 34. CLASSIF. LEVEL TEXT Unclassified 950. ABSTRACT This study presents a generalized method which will readily permit the determination of critical structural envelopes for aircraft exposed to atomic explosions. The task of defining these critical structural envelopes is quite involved and tedious due to the complicated relations governing the atmospheric variation with altitude, the passage of the atomic-explosion-caused shock wave through “the atmosphere, and the vector effect of gusts on airfoil surfaces. The complexity of these relations has necessitated the use of a lengthy iteration and interpolation procedure to determine the envelope for any aircraft/atomic weapon situation, which must be repeated for any other particular case. This generalized 9003390 OFFICIAL USE ONLY