title: Development of liquid-lithium film jet-flow for the target of (7)Li(p,n)(7)Be reactions for BNCT.
abstract: A feasibility study on liquid lithium target in the form of a flowing film was performed to evaluate its potential use as a neutron generation target of (7)Li(p,n)(7)Be reaction in BNCT. The target is a windowless-type flowing film on a concave wall. Its configuration was adapted for a proton beam which is 30mm in diameter and with energy and current of up to 3MeV and 20mA, respectively. The flowing film of liquid lithium was 0.6mm in thickness, 50mm in width and 50mm in length. The shapes of the nozzle and concave back wall, which create a stable flowing film jet, were decided based on water experiments. A lithium hydrodynamic experiment was performed to observe the stability of liquid lithium flow behavior. The flowing film of liquid lithium was found to be feasible at temperatures below the liquid lithium boiling saturation of 342°C at the surface pressure of 1×10(-3)Pa. Using a proto-type liquid lithium-circulating loop for BNCT, the stability of the film flow was confirmed for velocities up to 30m/s at 220°C and 250°C in vacuum at a pressure lower than 10(-3) Pa. It is expected that for practical use, a flowing liquid lithium target of a windowless type can solve the problem of radiation damage and target cooling.
authors.affiliation: Kyoto University Research Reactor Institute, Osaka 590-0494, Japan; Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan.
authors.forename: Tooru
authors.initials: T
authors.lastname: Kobayashi
authors.affiliation: Sukegawa Electric Co., Ltd., Ibaraki 317-0051, Japan.
authors.forename: Kuniaki
authors.initials: K
authors.lastname: Miura
authors.affiliation: Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan.
authors.forename: Noriyosu
authors.initials: N
authors.lastname: Hayashizaki
authors.affiliation: Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Aritomi
mesh_terms: D001608:Beryllium / Q000737:chemistry* / Q000528:radiation effects; D016754:Boron Neutron Capture Therapy / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008094:Lithium / Q000737:chemistry* / Q000528:radiation effects; D008422:Materials Testing; D008567:Membranes, Artificial; D009502:Neutrons; D010315:Particle Accelerators / Q000295:instrumentation*; D011874:Radiometry / Q000295:instrumentation*; D011879:Radiotherapy Dosage; D012996:Solutions
chemical_list: D008567:Membranes, Artificial; D012996:Solutions; D008094:Lithium; D001608:Beryllium
keywords: (7)Li(p,n)(7)Be reaction; Accelerator; BNCT; Film jet-flow; Liquid lithium; Neutron generation target