[en] This study aims at intending of upgrading of speed and resolution in electron beam control type high speed X-ray CT of which development has been promoted since then, and developing an unsteady multi-dimensional thermal-hydraulic measurement technique at non-contact to contribute upgrading of precision in two-phase flow analytical method. In 1998 fiscal year, a prototype of new multi-channel X-ray detector using high sensitivity semiconductor was made experimentally, and by carrying out pulse X-ray radiation tests some design parameters for manufacturing a detector for instrumentation were determined. And, a fluid loop was also set in a CT apparatus to test dynamics in gas-liquid two phase flow interface. (G.K.)