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Appl Radiat Isot. 2014 Jun;88:198-202. doi: 10.1016/j.apradiso.2013.12.013. Epub 2013 Dec 19.

Development of liquid-lithium film jet-flow for the target of (7)Li(p,n)(7)Be reactions for BNCT.

Author information

1
Kyoto University Research Reactor Institute, Osaka 590-0494, Japan; Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan.
2
Sukegawa Electric Co., Ltd., Ibaraki 317-0051, Japan.
3
Research Laboratory for Nuclear Reactors, Tokyo Institute of Technology, Tokyo 152-8550, Japan.

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.

KEYWORDS:

(7)Li(p,n)(7)Be reaction; Accelerator; BNCT; Film jet-flow; Liquid lithium; Neutron generation target

PMID:
24412425
DOI:
10.1016/j.apradiso.2013.12.013
[Indexed for MEDLINE]

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