A radiation detection apparatus comprising: a scintillator for generating scintillation photons in response to received radiation photons; a photosensor in optical communication with the scintillator for generating a photosensor signal in response to the scintillation photons; a first signal detector (202 1) arranged for generating a first output signal if the photosensor signal satisfies a first signal criteria, wherein the first signal criteria is configured to identify the photosensor signal as indicative of temporally initial scintillation photons generated by the scintillator in response to the received radiation photons; a second signal detector (202 2) arranged for generating a second output signal if the photosensor signal satisfies a second signal criteria, wherein the second signal criteria is configured to identify the photosensor signal as indicative of temporally subsequent scintillation photons generated by the scintillator in response to the received radiation photons; a radiation signal detector arranged for evaluating the first and second output signals to identify photosensor signals indicative of radiation received by the scintillator by determining whether a second output signal is generated within an acceptance time window following the generation of a first output signal, wherein photosensor signals are identified as indicative of radiation received by the scintillator if the second output signal is generated within the acceptance time window and photosensor signals are not identified as indicative of radiation received by the scintillator if the second output signal is not received within the acceptance time window. a scintillator for generating scintillation photons in response to received radiation photons; a photosensor in optical communication with the scintillator for generating a photosensor signal in response to the scintillation photons; a first signal detector (202 1) arranged for generating a first output signal if the photosensor signal satisfies a first signal criteria, wherein the first signal criteria is configured to identify the photosensor signal as indicative of temporally initial scintillation photons generated by the scintillator in response to the received radiation photons; a second signal detector (202 2) arranged for generating a second output signal if the photosensor signal satisfies a second signal criteria, wherein the second signal criteria is configured to identify the photosensor signal as indicative of temporally subsequent scintillation photons generated by the scintillator in response to the received radiation photons; a radiation signal detector arranged for evaluating the first and second output signals to identify photosensor signals indicative of radiation received by the scintillator by determining whether a second output signal is generated within an acceptance time window following the generation of a first output signal, wherein photosensor signals are identified as indicative of radiation received by the scintillator if the second output signal is generated within the acceptance time window and photosensor signals are not identified as indicative of radiation received by the scintillator if the second output signal is not received within the acceptance time window.