Crooke’s x-ray tube

 The Crooke’s X-ray tube invented by sir William Crooke’s in 1875. It’s also called gas tube because the some amount of air are present in this tube. In beginning the gas Field x-ray tube were used to produce x-ray. The Crooke’s x-ray tube consists of two electrodes, one is cathode and other is anode. The cathode and anode are covered by a glass envelope and the both electrodes are kept in opposite site in each other.

                               The cathode is aluminum concave disk. The anode or target is made up of tungsten or platinum backed with copper. The target is put on 45° angle with axis of cathode neck.

                               In a Crooke’s or gas tube, A small amount of air is always left in this tube. During the exposure time, when a high voltage is applied between the cathode and anode, the air inside the tube gets ionized and electrons are produced. These electrons move at high speed at anode side and produce an avalanche of electrons by collision with air molecules.

                  When the electron stream strikes the target, the the x-ray are emitted.