materials and subjected to fallout from this type of burst. Results should be forthcoming on the neutron flux and energy spectrum as a functiotiof distance and also as a function of angle from the axis of linear-type devices. Full evaluation of field data should advance the state of knowledge as to the type of protection, if any, required for bomb neutrons. The experimental determination of the radioactivity from a thermonuclear detonation in various typical soil samples was attempted so that a basis could be obtained for predicting soil radioactivity for a nuclear explosion at any location. No data were obtained because of the bombing error on the EGEETE Some data were obtained during ship-shielding studies on the relative radiation dose rates contributed by contamination of the air envelope, water envelope, and the ship’s weather surfaces. Phantoms for depth dose measurements, in conjunction with standard dosimeters worn externally, were exposed on two of the fallout ships. Data, ¢ primarily from WET indicate inconsistencies in the dosimeter readings and the biologically significant depth dose. Investigations on the relative effectiveness and cost of various proposed ship and personnel reclamation methods were made. These studies were - primarily conducted in conjunction with the fallout-collection ships. A proof-test decontamination procedure was conducted on the fallout- collection ships. The procedure consisted of firehosing, hand scrubbing with detergent, and a second firehosing. ‘Verification was attempted of Washdown Effectiveness as a Shipboard Raimogical Countermeasure. The majer fallout was encountered during ae eae and the effectiveness of the washdown system on the contaminant from this shot is being studied. 2.1.3 Program 3, Structural Response The primary objective of Program 3 and of the single, sizable Project 3.1 comprising the program was to obtain information regarding the effect of the positive-phase length of blast from nuclear weapons on the response of drag-type and semidrag-type structures. The secondary objective of Project 3.1 was to study further the general problem of drag loading and response of structures to blast forces. This project on Operation Redwing was actually the second part of a two-part study. The first part was conducted during Operation Teapot and involved the response of four typical single-story, steel-frame, industrial buildings to a 22-kt burst, with a relatively short duration positive-phase air blast. The second part involved the response of identical industrial- building structures to an air burst of approximately with a relatively wN N ay -~ 31 - AFWLIHO Zz 9