In this Letter, a polymer optical fiber (POF) detector with a convex spherical aperture microstructure probe is designed for low-energy and low-dose rate gamma-ray detection. Simulation and experimental results demonstrate that this structure has a higher optical coupling efficiency and that the angular coherence of the detector depends strongly on the depth of the probe micro-aperture. By modeling the relationship between angular coherence and micro-aperture depth, the optimal depth of the micro-aperture is determined. The sensitivity of the fabricated POF detector is 701 cps at 59.5-keV gamma-ray of 2.78 µSv/h and the maximum percentage error of the average count rate at different angles is 5.16%.
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