Proton energy measurement using stacked silicon detectors

Proton energy was measured using stacked Si(Li) detectors at the MC-50 cyclotron of KIRAMS (Korea Institute of Radiological and Medical Sciences). The proton energy from the cyclotron was 45 MeV. Generally, using a single semiconductor detector it is not available to measure the proton energy above 30 MeV because the maximum thickness of the commercial semiconductor detector was limited to 5mm. We have used a Si(Li) detector stack consisting of three detectors having different thicknesses of 0.15 mm, 2 mm and 5 mm respectively. The active areas of these detectors are 150 mm² and 75 mm ². In this paper, we report the preliminary results of energy measurement using these Si(Li) detector stack.