The emphasis during the first quarter has been directed toward evaluating radiometric approaches to find the optimum technique to measure temperature in an entrained gasifier environment. In this regard, it was concluded that while total radiation measurements were helpful in providing designers with total radiation loads to hardware, it was not acceptable as a means of measuring temperature for the gas/particle environment considered. To make the temperature measurements, one, two, and three line radiometers (pyrometers) were evaluated. It was found that a single (one) line pyrometer measurement of resonance radiation from a trace alkalai metal in the gas provides a very promising technique to provide spatially resolved temperature measurements. A detailed description of governing equations controlling this technique is given. During the next quarter, laboratory prototype probes will be assembled, tested and evaluated. 8 figures, 10 tables.