An X-ray source for a medical detection, and a movable CT scanner. The X-ray source for a medical detection comprises an X-ray tube and a high-voltage generator. The X-ray tube comprises an anode (1), a cold cathode (2), a gate (3), and a tube case (4). The tube case (4) is used for supporting the anode (1), the cold cathode (2) and the gate (3), and enabling a vacuum working environment of the anode (1), the cold cathode (2) and the gate (3) to be insulated from the outside. The anode (1) is grounded. The high-voltage generator is used for providing a first electric field between the cold cathode (2) and the gate (3) to enable the cold cathode (2) to emit electrons in a field mode, and is used for providing a second electric field between the gate (3) and the anode (1) to accelerate the electrons emitted by the cold cathode (2), thereby enabling the electrons to bombard the anode (1) to generate X-rays. The X-ray source can implement high-frequency pulse transmission of electron beams very easily, the response speed is fast, the service life is long, and security is high, that is, the overall performance of the X-ray source is improved, and practical application demands such as a medical detection can be better met.La présente invention concerne une source de rayons X de détection médicale et un scanner mobile de tomodensitométrie (CT). La source de rayons X de détection médicale comprend un tube à rayons X et un générateur de haute tension. Le tube à rayons X comprend une anode (1), une cathode froide (2), une grille (3) et un boîtier de tube (4). Le boîtier de tube (4) est utilisé pour supporter lanode (1), la cathode froide (2) et la grille (3), et pour permettre disoler de lextérieur un environnement de travail sous vide de lanode (1), de la cathode froide (2) et de la grille (3). Lanode (1) est mise à la terre. Le générateur de haute tension est utilisé pour établir un premier champ électrique entre la cathode froide (2) et la grille (3) pour permettre à la ca
