below natural-grade level, the structures were confined within massive non-drag sensitive earthwork configurations of coral sand. Empirical of of the responses determinations were made (1) three earth-confined prefabricated corrugated-steel flexible arches when subjected to relatively long-duration blast loadings from a megaton range detonation; and (2) one similar earth-confined flexible-arch when subjected to relatively short-duration blast loadings from a kiloton-range detonation. Major Descriptors: *FALLOUT SHELTERS -- BLAST EFFECTS; *FALLOUT SHELTERS -SHIELDING; *HARDTACK PROJECT; *MECHANICAL STRUCTURES -- BLAST EFFECTS; *NUCLEAR EXPLOSIONS -- BLAST EFFECTS Descriptors: DETONATIONS; Broader Terms: COMPOUNDS; GROUND WATER; Subject Categories: 450202* Weaponry -- (-1989) 10/5/5115 01877589 SAND EXPLOSIONS; HYDROGEN COMPOUNDS; SHELTERS; WATER T.D.; OXYGEN -- Explosions & Explosives -- Nuclear -- (Item 215 from file: 103) ERA-12-005116; EDB-87-005222 Author(s): HanScome, Gorbics, §.G. NUCLEAR EXPLOSIONS; Alers, P.B.; Caldwell, P.A.; Drachman, R.J.; Title: Operation Hardtack. Project 2.6. Neutron flux from very~high-altitude bursts Corporate Source: Naval Research Lab., Washington, DC (USA) Publication’ Date: .1°Sep 1985 p 97 Report Number(s): AD-A-995383/7/XAB Document Type: Report Language: English Journal Announcement: EDB8611 Availability: NTIS, PC AO5/MF AOl. Subfile: ERA (Energy Research Abstracts). GRA (NTIS NTS) Country of Origin: United States Country of Publication: United States Abstract: The primary objective of this project was to measure neutron flux and gamma-ray flux versus range and time from missile-borne, megaton nuclear detonations at high altitudes by means of instrumented pods that were to be ejected, during the missile thrust period, at times that were selected to position the pods at predetermined distances from the burst. Specific objectives were: (1) neutron flux versus time was to be measured at each of three pod positions during each shot and (2) a measurement of gamma-ray dose rate versus time was sought from each pod during each shot. Major Descriptors: *HARDTACK PROJECT; *NUCLEAR EXPLOSIONS -- GAMMA RADIATION; *NUCLEAR EXPLOSIONS -- NEUTRON FLUX Descriptors: ATMOSPHERIC EXPLOSIONS; DETONATIONS Broader Terms: ELECTROMAGNETIC RADIATION; EXPLOSIONS; IONIZING RADIATIONS; NUCLEAR EXPLOSIONS; RADIATION FLUX; RADIATIONS Subject Categories: 450202* Weaponry -- (-1989) -- Explosions & Explosives -- Nuclear -- 10/5/516 (Item 216 from file: 103) 01877588 BRA-12-005115; EDB-87-005221 Author(s): Hansen, D.F.; Perry, J.E.; Rockman, A.G. Title: Operation Hardtack. Report to the Scientific Director. and total-thermal measurements Corporate Source: Publication Date: Report Number(s): Naval Research Lab., 1 Sep 1985 p 47 Washington, DC (USA) AD-A-995381/1/XAB Document Type: Report Language: English Journal Announ¢eement: EDB8611 Availability: NTIS, PC A03/MF AOl. Subfile: BRA (Energy Research Abstracts). Country of Origin: United States Country of Publication: United States 9003795 GRA (NTIS NTS) Power-time