查看文章

The hydrogen analysis of minerals and rocks by means of the resonant nuclear reaction 1 H (19 F, αγ) 16 O or 1 H (15 N, αγ) 12 C was started as a new project in 2000. One of the objectives is the measurement of the concentration of water in fluid inclusions in minerals. Since the size of the fluid inclusions in the range from 100 to 30 µm or less, the incident 19 F or 15 N beam must be focused on mineral samples in an area as large as those of fluid inclusions. In addition to the transverse confinement of the area of beam irradiation, the measurement of depth profile is necessary for three-dimensional mapping of water in fluid inclusions. We have developed a new beam line dedicated to the hydrogen analysis in the 0 beam course in the first target room. This report describes the design and a preliminary test experiment to estimate beam currents through a narrow slit.