Radiation dose control device for controlling an electron beam pulse delivered during iort

An intra-operative radiotherapy or IORT machine comprising:

• a linear accelerator or LINAC (AL);
• a diode-type electron gun (G);
• a PWM system configured to provide an injection of a first electron beam (FE), with the same DC voltage and energy, from said electron gun (G) into said LINAC (AL), so that a second electron beam (FU) at the output of said LINAC (AL) is highly stable,
• characterized in that said IORT machine also comprises a dose control device for controlling the dose, for each pulse, of said second electron beam (FU) which is delivered during a treatment of intra-operative radiotherapy, said dose control device being used for obtaining a dose variation of said second electron beam (FU) only on the basis of a variation of the delivery time of said first electron beam (FE), wherein said dose variation of said second electron beam (FU) is directly proportional to said delivery time of said first electron beam (FE) and wherein said dose control device is configured to delay said first electron beam (FE), which is injected into said LINAC (AL) in a phase during which a maximum amount of energy is transferred to said LINAC (AL).