Radiation treatment apparatus

A radiation treatment apparatus comprising:

• an accelerator that emits a charged particle beam;
• a time measurement unit that measures an emission time of the charged particle beam of the accelerator;
• a first control unit that controls the accelerator based on the emission time measured by the time measurement unit;
• and
• an emission determination unit that determines whether or not the accelerator is emitting the charged particle beam while the first control unit is controlling the accelerator,
• wherein the time measurement unit adds a time, for which a result of a determination performed by the emission determination unit is that the accelerator is emitting the charged particle beam, to the emission time of the charged particle beam of the accelerator and does not add a time, for which the result of the determination performed by the emission determination unit is that the accelerator is not emitting the charged particle beam, to the emission time of the charged particle beam of the accelerator.