A Mapping Method for Chemicals in Fire-Retardant-Impregnated Wood Using Energy Dispersive X-Ray Fluorescence Analysis I: Desirable measuring condition based on relation between retardant concentration and measured value

As a way of examining the uneven distribution of chemicals inside fire-retardant-impregnated wood, energy dispersive X-ray fluorescent analysis (EDXRF) is thought to be effective. Slices of fire-retardant-impregnated wood (Cryptomeria japonica) were subjected to EDXRF mapping under different conditions, and the results were correlated with the weight of chemical solids in the wood. The coefficient of determination increases when the dwell time is increased, or collimator size is optimized. Regardless of the measurement conditions, the relationship was not linear but had one-to-one correspondence, so we concluded that EDXRF mapping can be an effective way of analyzing the distribution of chemicals inside fire-retardant-impregnated wood.