| 摘要 |
<p>A movable projector unit for welding control purposes with pipe-lines and the like, comprising a motor driven carriage, a carriage mounted projector for gamma radiation provided with a protective housing having an axially extending channel therein for the movement of a holder for a radio active source, and a micropneumatic device to move said source holder from the shielded rest position in the housing to an exposure position and back, and a remotely controllalble, electronic unit to control the motor of the carriage and the micro-pneumatic device of the projector.</p> |
