Order number page 43 940406-171827-13 set 5 with 102 of OFFICIALUSE ONLY thermal radiation by a nuclear detonation. It consists of irradiating the surface with a known amgunt of thermal energy and measuring the energy absorbed. The methods and equipment for the measuring technique, tested in the laboratory and during Operation Redwind, were shown to be reliable, 801. KEYWORD (S) repeatable, and accurate to within a probable error of +- 5 percent. It is concluded that the absorptivity values obtained on painted panels by the thermal irradiation method define that portion of the incident energy causing a temperature rise in the panel more accurately than does a method depending on the measurement of reflected energy. 6 references. AIRCRAFT SKIN/absorptivity ; THERMAL RADIATION/absorption ;PAINTS/absorptivity ;ABSORPTIVITY; ABSORPTION; PAINTS; ATOMIC EXPLOSIONS; REDWING; MEASUREMENT ; THERMAL RADIATION EFFECTS Item 150. 110. 70. 710. 371. 34. 950. 77 REPORT NUMBER PRIMARY TITLE (M) ITR--1630-2 Behavior of deep reinforced-concrete slabs in high-pressure regions. Project 3.6 (supplement) [of] Operation Hardtack PERSONAL AUTHOR (M) CORPORATE SOURCE R.N. (USA) PUB. DATE (YYMMDD) CLASSIF. LEVEL TEXT ABSTRACT Bultmann, E.H. Jr.; Haltiwanger, J.D.; Wright, III Air Force Special Weapons Center, Kirtland AFB, NM ;Illinois Univ., Urbana (USA) 581215 Official Use Only (See also ITR-1630-1.) This is a summary of all data acquired since the submission of the ITR-1630-1. The data indicate that the design criteria used to proportion the test specimens is unnecessarily conservative. Since the one-way slabs at the high-pressure level were damaged enough to define closely their dynamic strengths in flexure and diagnoal tension, it will be possible to establish definitive design criteria for slabs for this type. The damage sustained by the one-way slabs at the lower pressure level was minor; however, it should be adequate to indicate the applicability or lack thereof of these design criteria to slabs under lower blast pressures. Because of the nature of the damage sustained by the 801. KEYWORD(S) 5003411 two-way slabs, which apparently resulted pPimarily from their proximity to the crater, it will not be possible to establish design criteria for them as well defined as the criteria to be developed for the one-way slabs. STRUCTURAL ELEMENTS/blast REINFORCED CONCRETE OFFICIAL USE ONLY loading ;HARDTACK;