Temperature dependent fluorescent emission lines of several rare-earth-doped ceramic phosphors have made these and similar materials the focus of major efforts in the field of non-contact thermometry over the past few decades. In the application of phosphor thermography one of the technical issues encountered is that of bonding (i.e., secure adhesion of) the phosphor particles to the surface undergoing thermography. A simple novel bonding technique is proposed here, which significantly increases the utility of the method and saves a considerable amount of time for short-term measurements in non-erosive environments. The process discussed is based on the use of chalk, in which phosphor is mixed with in equal parts with plaster of paris and a small amount of water and then solidified. This phosphor chalk is easily applied to surfaces and has been shown to yield acceptable results for measurements with the 514-nm line of La{sub}2O{sub}2S: Eu. A steel block was also coated with Mg{sub}4FgeO{sub}6: Mn chalk and heated to 900 C and then successfully used to measure lower temperatures showing the phosphor to still be attached to the block.
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