Subject Categories: 450202* Weaponry ~~ (1989) 10/5/647 01552142 Author(s): -- Explosions & Explosives -~ Nuclear -- (Item 347 from file: 103) BRA-10- 021614; EDB-85-058915 Plum, W.B. Parker, W.d. Title: Spectral distribution of irradiance with a time resolution San Francisco, CA Naval Radiological Defens¢ Lab., Corporate Source: (USA) Publication Date: 25 dul 1958 p 18 ‘ Report Number(s): AD-362108/3/XAD Note: Report on Operation Redwing ~- Project 8.1c Document Type: Report Language: English Journal Announcement: EDB8501 Availability: NTIS, PC A02/MF AO1. Country of Origin: United States Country of Publication: United States Abstract: A multichannel recording spectrometer with high time resolution in the spectral range of 2,500 to 25,000 A was used to measure the spectral distribution of the irradiance as a function of time received at two locations for Shot Cherokee and at one location for Shot Zuni. Due to a large drop error, the point of detonation occurred outside of the field of view of both instruments on Cherokee. The spectral distribution of the irradiance received at the time of the second maximum for Shot Zuni showed that a large portion of the energy was in the infrared region of the spectrum. The distributions at other times are not reported, since the irradiance levels were much lower than expected because of considerable cloud obscuration of the Fireball. Major Descriptors: *ATMOSPHERIC EXPLOSIONS; *NUCLEAR EXPLOSIONS RADIATION; *REDWING PROJECT -- THERMAL RADIATION Descriptors: SPECTROSCOPY Broader Terms: BLECTROMAGNETIC RADIATION; Subject Categories: 450202* Weaponry -- (~1989) EXPLOSIONS; -- THERMAL RADIATIONS -- Explosions & Explosives -- Nuclear -- 10/5/648 (Item 348 from file: 103) 01552141 ERA-10-021614; EDB-85-058914 Author(s): Plum, W.B.; Jenkins, R.J. Title: Measurement of irradiance at high time resolution Corporate Source: Naval Radiological Defense Lab., San Francisco, (USA) Publication Date: Report Number(s): 30 Apr 1958 CA p 30 AD-357966/1/KAD Note: Report on Operation Redwing--Project 8.15 Decument Type: Report Language: English Journal Announcement: EDB8501 Availability: NTIS, PC A03/MF AOl. Country of Origin: United States Country of Publication: United States Abstract: Irradiance versus time was recorded for two multimegaton detonations. Data on the Cherokee shot was not obtained due to the large drop error. Satisfactory performance was obtained from the instrumentation on the Zuni shot; times to first maximum, minimum, and second maximum were obtained as well as the total thermal energy distribution through time. The values recorded for Zuni appear to confirm the practicability of scaling from small to large yields in the various scaling laws. The relative amplitudes of the first and second pulses is reversed for the Zuni shot as compared to smaller devices, with the second maximum considerably higher than the first. Evidence is presented to show that considerable care must be exercised in the interpretation of the data. The Pacific atmosphere makes it essentially impossible to extrapolate from irradiance measurements at a distant point back to the device itself. Evidence is presented to show that considerable care must be exercised in the interpretation of the data.