A detection apparatus for detecting radiation, the detection apparatus (6, 12) being adapted to be used by a computed tomography system comprising a radiation source generating polychromatic x-rays as radiation, wherein the apparatus comprises: - a radiation receiving unit including: - a first scintillator for generating first scintillation light depending on the radiation, wherein the first scintillation light has a first temporal behavior, - a second scintillator for generating second scintillation light depending on the radiation, wherein the second scintillation light has a second temporal behavior being different to the first temporal behavior, - a scintillation light detection unit for detecting the first scintillation light and the second scintillation light, said detection apparatus being characterized in said scintillation light detection unit for generating a common light detection signal being indicative of the first scintillation light and the second scintillation light, - a detection values determining unit for determining a first detection value and a second detection value, wherein the detection values determining unit is adapted to: - determine the first detection value by applying a first determination process on the common light detection signal, wherein the first determination process includes frequency filtering the common light detection signal by using a first frequency filter, thereby generating a first filtered common light detection signal, and determining the first detection value depending on the first filtered common light detection signal, - determine the second detection value by applying a second determination process on the common light detection signal, wherein the second determination process is different to the first determination process. - a radiation receiving unit including: - a first scintillator for generating first scintillation light depending on the radiation, wherein the first scintillation light has a first temporal behavior, - a second scintillator for generating second scintillation light depending on the radiation, wherein the second scintillation light has a second temporal behavior being different to the first temporal behavior, - a scintillation light detection unit for detecting the first scintillation light and the second scintillation light, said detection apparatus being characterized in said scintillation light detection unit for generating a common light detection signal being indicative of the first scintillation light and the second scintillation light, - a first scintillator for generating first scintillation light depending on the radiation, wherein the first scintillation light has a first temporal behavior, - a second scintillator for generating second scintillation light depending on the radiation, wherein the second scintillation light has a second temporal behavior being different to the first temporal behavior, - a scintillation light detection unit for detecting the first scintillation light and the second scintillation light, said detection apparatus being characterized in said scintillation light detection unit for generating a common light detection signal being indicative of the first scintillation light and the second scintillation light, - a detection values determining unit for determining a first detection value and a second detection value, wherein the detection values determining unit is adapted to: - determine the first detection value by applying a first determination process on the common light detection signal, wherein the first determination process includes frequency filtering the common light detection signal by using a first frequency filter, thereby generating a first filtered common light detection signal, and determining the first detection value depending on the first filtered common light detection signal, - determine the second detection value by applying a second determination process on the common light detection signal, wherein the second determination process is different to the first determination process. - determine the first detection value by applying a first determination process on the common light detection signal, wherein the first determination process includes frequency filtering the common light detection signal by using a first frequency filter, thereby generating a first filtered common light detection signal, and determining the first detection value depending on the first filtered common light detection signal, - determine the second detection value by applying a second determination process on the common light detection signal, wherein the second determination process is different to the first determination process.