Development of X-ray photoacoustic spectroscopy and application to biological analysis

点击翻译按钮获取中文摘要

X-ray photoacoustic spectroscopic methods were developed and the fundamental studies were perpormed.1) Differential X-ray photoacoustic method and imaging analysis. Scanning X-ray photoacoustic imaging method was developed. The time lag in the signal which is due to the heat ptopagation through the surface layer was detected as phase lag and this phase lag was also imaged and used for the estimation of the depth of the surface layer. This method will enable us a 3-dimensional analysis of metal ions. X-ray photoacoustic imaging by computer tomography (CT) was also developed. Difference imaging using two wavelenfgt of X-ray was easily applied in this method which clarified the distribution of specific atomic components in the sample.2) Development of Photoacoustic EXAFS The fine structure in X-ray absorption spectrum (EXAFS) was found in X-ray photoacoustic spectra. This method revealed the structure below the surface layer and the optically opaque materials with no destructive sampling procedure. The biological samples of powder was also measured.3) Development of Semi-pulse X-ray Photoacoustic spectroscopy Semi-pulse X-ray was irradiated to samples. It was found that the signal from sublayer was detected and separated to get the depth and/or thermal property of surface layer. These nobel methods are useful for non-destructive evaluation and characterization of wide varieties of materials.