Experimental techniques were developed to visualize liquid metal flows
by neutron radiography. Lead-bismuth eutectic was used as a working f
luid. Tracer and dye injection methods were employed for the visualiza
tion. A tracer made of gold-cadmium intermetallic compound and a dye m
ade of lead-bismuth-cadmium alloy were developed. It was shown that bo
th methods were suitable for flow visualization in a liquid metal. The
use of this visualization technique to study thermal hydraulics in a
liquid metal-cooled blanket for a fusion reactor is discussed.