Ionization chamber with detachable end window

The utility model discloses an ionization chamber with a detachable end window, which comprises an ionization chamber body, a first vacuum valve, the end window and a readout component. A bias electrode and a collecting electrode are arranged in the ionization chamber body; voltage is applied between the bias electrode and the collecting electrode; the first vacuum valve is detachably connected with one end of the ionization chamber body and used for sealing vacuum at the end of the ionization chamber body; a valve hole is arranged in the first vacuum valve; the end window is embedded into the inner side of the valve close to the direction of the ionization chamber body, so that ionization rays can enter the space between the bias electrode and the collecting electrode in the ionization chamber body; and the readout component is used for measuring current generated on the collecting electrode. The ionization chamber can be more convenient in detachment, maintenance, test and use, and is more precise in measur