Operation Greenhouse. Annex 6.2. The Effect of Thermal Radiation on Material.
Scientific director's rept.,
NAVAL RADIOLOGICAL DEFENSE LAB SAN FRANCISCO CA
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Project 6.2 was set up partly to obtain informaiton concerning the characteristics of thermal radiation from an atomic bomb detonation necessary to the prosecution of the general laboratory thermal program and partly to make exposures of materials which could not be done in the laboratory. The thermal-radiation characteristics of greatest interest were the total energy, the time-intensity relation, and the spectral distribution. Measurements of these characteristics were made at several distances using calorimeters with oscillographic recorders, rotating drums with sensitive-paper indicators, and passive receivers consisting of metal foils. Rough spectral measurements indicated that the bulk of the thermal radiation was in the visible portion of the spectrum, although all measurements are uncertain to 10 per cent of the total thermal energy.