MEASUREMENT OF THE SPECTRAL REFLECTANCE OF REACTOR-IRRADIATED THERMAL-CONTROL COATINGS.
Technical rept. 1 Oct 64-1 Feb 66,
GENERAL DYNAMICS FORT WORTH TX NUCLEAR AEROSPACE RESEARCH FACILITY
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Equipment has been designed and fabricated for the measurement of spectral reflectance of reactor-irradiated thermal-control coatings. Up to 120 specimens can be irradiated, transferred from the reactor site to the laboratory, and measured for reflectance--all while the specimens are maintained in high vacuum. The equipment consists of a vacuum-irradiation chamber and a vacuum-measurements chamber that can be coupled through a pair of 4-inch gate valves. Specimens are brought to the measurement port of an integrating sphere or a hohlraum by means of a conveyor chain and plunger. The reflectance is measured by use of a ratio-recording spectrophotometer. Six specimens each of seven types of thermal-control coatings were irradiated for 98 hours at a power level of 2.5 Mw by the Ground Test Reactor. Reflectance in the 0.3- to 2.2-micron range was measured by use of a MgO reference, an MgO-coated integrating sphere, a tungsten source, a fused-silica prism, and photomultiplier and lead-sulphide detectors. Equipment malfunctions prevented the acquisition of all the desired data, and only part of the measurements were made with the specimens in vacuum. Author
- Nuclear Instrumentation