Patent ID: 9116096
Filing Date: 2015-08-25
Classification: G01N,H01J,H05G

Abstract:
1. A multi-radiation unit, comprising: (a) a multi-radiation tube including a plurality of electron sources, a plurality of targets respectively corresponding to the plurality of electron sources and an intermediate electrode located between the electron sources and the targets, the intermediate electrode including openings through which electrons emitted from the electron sources pass through; (b) a selection circuit configured to allow electrons to be emitted from a selected electron source selected from the plurality of electron sources; (c) an intermediate electrode potential defining unit configured to define a potential of the intermediate electrode; (d) a storage unit configured to store, for each of the plurality of electron sources, an electrostatic control condition of the intermediate electrode for obtaining a predetermined irradiated state of a target corresponding to the selected electron source; and (e) a changing unit configured to change, when electrons are emitted from the selected electron source, the electrostatic control condition of the intermediate electrode based on the electrostatic control condition stored in the storage unit for the selected electron source.