Subject Categories: 450202* Weaponry -- (-1989) 10/5/645 01552144 Author(s): -- Explosions & Explosives -- Nuclear -- (Item 345 from file: 103) EBRA-10-021614; EDB-85-058917 FlorCruzg, P.R.; Young, C.G. Jr.; Andrews, T.J. Title: Measurement of material density with beta densitometer Corporate Source: Los Alamos Publication Date: Feb 1953 Scientific Lab., p 38 NM (USA) ® ‘ Report Number(s): AD-363619/8/XAD Note: Report on Operation Ivy, Project 6.9 Document Type: ‘ Report Language: English Journal Announcement: EDB8501 Availability: NTIS, PC A03/MF AOQl. Country of Origin: United States Country of Publication: United States Abstract: The objective of beta-densitometer instrumentation at Ivy Mike shot was, primarily, to measure material density near ground surface as a function of time and, secondarily, to test the latest modifications to previous densitometer models. The results showed (1) that thermal or preshock dust is absent at a ground range of about 23,000 ft 690.02), (2) that it (Station is possible to calculate the overpressure due to air shock alone from the measured density change, preshock turbulence is not excessive, and (3) provided that that the modifications to the densitometer proved to be satisfactory. The calibration and electronic engineering of the Ivy model densitometer were considerably improved over previous models. Major Descriptors: *IVY PROJECT -- MEASURING INSTRUMENTS; *NUCLEAR EXPLOSIONS -- MEASURING INSTRUMENTS Descriptors: BETA PARTICLES; DENSITOMETERS Broader Terms: CHARGED PARTICLES; EXPLOSIONS; MEASURING INSTRUMENTS; NUCLEAR EXPLOSIONS; PHOTOMETERS Subject Categories: 450202* Weaponry ~~ (-1989) 10/5/646 01552143 Author(s): -- Explosions & Explosives -- Nuclear -- (Item 346 from file: 103) BRA-10-021614; EDB-85-058916 Baker, W.D. Title: Water-wave motion pictures over shallow water Corporate Source: Los Alamos Scientific Lab., NM (USA) Publication Date: Feb 1953 p 44 Report Number(s): AD-363572/9/XAD Note: Report on Operation Ivy, Project 6.4a Document Type: Report Language: English Journal Announcement: EDB8501 Availability: NTIS, PC AO3/MF AOl. Country of Origin: United States Country of Publication: United States = Abstract: Motion pictures were taken of the waves produced by the Ivy Mike shot. They were taken over shallow water inside the lagoon near some of the islands of the atoll. Records were obtained at Elmer and Yvonne which give arrival times corresponding to an average wave velocity of about 80 ft/sec. The general character of the waves was a long slow rise followed by a long negative phase during which several smaller oscillations were observed. The complete wave train was not observed. The indicated product of wave amplitude (highest to lowest water) times the horizontal distance from zero was 4.5 x 10/sup 5/ sq ft. Since this value was increased by shoaling, the deep-water amplitude was somewhat less, and the product is estimated as 2.7 x 10 to the 5th power sq ft. The results are in agreement with theory, including the predictions of George N. White on the upper limit for the Mike water-wave amplitudes. Major Descriptors: *IVY PROJECT -- WATER WAVES; *NUCLEAR EXPLOSIONS <-WATER WAVES Broader Terms: EXPLOSIONS; GRAVITY WAVES; NUCLEAR EXPLOSIONS ro Oey ry ae to FD