Abstract
We discuss two fundamental flow schemes of liquid lithium planned for the target and coolant of BNCT (Boron Neutron Capture Therapy) using accelerators which makes tumors curable with cell-level selections. Our objects are the flows in a high-vacuum because of operating accelerators, and they serve both as a target of accelerators and as a coolant for the target itself. The latter role requires high-speed flows for sufficient removals of proton beam heating. In this paper, we compare the momentum defects of the film flow on a flat guide plate with that of the sheet jet.
