  A new type of a trigger-scintillation counter array designed for the MTV
experiment at TRIUMF-ISAC has been developed, which uses aluminum-metallized
film tape for wrapping to achieve the required assembling precision of $\pm$0.5
mm. The MTV experiment uses a cylindrical drift chamber (CDC) as the main
electron-tracking detector. The barrel-type trigger counter is placed inside
the CDC to generate a trigger signal using 1 mm thick, 300 mm long thin plastic
scintillation counters. Detection efficiency and light attenuation compared
with conventional wrapping materials are studied.
