Method for the verification of the range of a charged hadronic particle radiation of a radiation device for radiation therapy by measuring prompt gamma radiation being produced by the charged hadronic particle radiation when passing tissue of an object to be radiated with at least one detector being able to detect single gamma particles of the prompt gamma radiation and at least one analyzer, comprising the following steps: - when detecting a gamma particle, furthermore denominated as event, a signal is created in the detector, whereby the signal is correlated in time with the arrival of the gamma particle in detector, - the analyzer, analyzing the signal of the detector, does assign either every event or selected events a time of detection, - the radiation device or a separate particle detector does provide a reference signal, which is correlated to the emersion of single particles or particle bunches from the radiation device out of the radiation device with an uncertainty in time of equal or smaller than 10ns, - a time t1 is obtained from the reference signal for each event or each of the selected events in the analyzer, at which the particle or the particle bunch, which has produced the gamma particle detected by the detector, further described as event triggering particle or particle bunch, has passed a reference plane perpendicular to the direction of the beam of the radiation device, - a time t2 is obtained from the detector, corresponding to the striking of the gamma particle in detector - the time difference t between the time of the detection of the gamma particle in the detector t2 and the time of the passing of the reference plane by the event triggering particle or particle bunch t1 is calculated for each event or the selected events within the analyzer, said time difference being a measure for the length of the flight path of the charged hadronic particle radiation, - at least one statistic distribution of the time differences t is obtained in the analyzer, furthermore described as time distribution, characterized in that the method further comprises the following steps: - integral parameters are determined from the time distribution, wherein the integral parameters represent information about the range of the charged hadronic particle radiation in the object to be radiated, wherein the integral parameters are compared with a time distribution of a reference to determine movements in the range of the charged hadronic particle radiation in the object to be radiated, so that a statement with respect to the conformity of the radiation therapy to be verified with the apparatus with the therapy plan can be obtained mainly from that time distribution, and that - the analyzer does analyze the time distribution, thereby deriving information about the range of the particle beam, so that a statement regarding the conformity with the therapy to be verified by the device with the radiation plan is given in real time, said statement being derived from an integral parameter of the time distribution. - when detecting a gamma particle, furthermore denominated as event, a signal is created in the detector, whereby the signal is correlated in time with the arrival of the gamma particle in detector, - the analyzer, analyzing the signal of the detector, does assign either every event or selected events a time of detection, - the radiation device or a separate particle detector does provide a reference signal, which is correlated to the emersion of single particles or particle bunches from the radiation device out of the radiation device with an uncertainty in time of equal or smaller than 10ns, - a time t1 is obtained from the reference signal for each event or each of the selected events in the analyzer, at which the particle or the particle bunch, which has produced the gamma particle detected by the detector, further described as event triggering particle or particle bunch, has passed a reference plane perpendicular to the direction of the beam of the radiation device, - a time t2 is obtained from the detector, corresponding to the striking of the gamma particle in detector - the time difference t between the time of the detection of the gamma particle in the detector t2 and the time of the passing of the reference plane by the event triggering particle or particle bunch t1 is calculated for each event or the selected events within the analyzer, said time difference being a measure for the length of the flight path of the charged hadronic particle radiation, - at least one statistic distribution of the time differences t is obtained in the analyzer, furthermore described as time distribution, - integral parameters are determined from the time distribution, wherein the integral parameters represent information about the range of the charged hadronic particle radiation in the object to be radiated, wherein the integral parameters are compared with a time distribution of a reference to determine movements in the range of the charged hadronic particle radiation in the object to be radiated, so that a statement with respect to the conformity of the radiation therapy to be verified with the apparatus with the therapy plan can be obtained mainly from that time distribution, and that - the analyzer does analyze the time distribution, thereby deriving information about the range of the particle beam, so that a statement regarding the conformity with the therapy to be verified by the device with the radiation plan is given in real time, said statement being derived from an integral parameter of the time distribution.