Disclosed is a technology for obtaining a large area fiber plate suited
for downsizing a radiation imaging apparatus and reducing its cost and excellent
of workability in the manufacturing process. A multi-fiber is manufactured by bundling
and drawing a plurality of fibers to take a polygonal shape in section so that
the multi-fibers can be air-tightly stacked without any air gap, a multi-fiber
aggregate is manufactured by bundling and drawing the multi-fibers to take other
polygonal shape in section that enables air-tight stacking with no air gap so as
to be analogous to or different from the one polygonal shape in section, and there
is manufactured a fiber plate configured by air-tightly bonding the multi-fiber
aggregates to each other with a bonding agent without the air gap in a state of
keeping the one or other polygonal shape in section after being drawn.
