Radiation shielding tube, and shielding device and method

Disclosed is a radiation shielding tube, wherein a guide tube is made of tungsten or the like, which is excellent in shielding performance, and is configured to be movable depending on various positions where a collimator is installed, so that the guide tube can effectively shield a radiation exposed during movement of a radiation source or an RT work in the tube. The radiation shielding tube has a guide tube which is disposed between a radiation source container and a collimator and connects them to each other, and the guide tube is formed in an articular form to be bendable.