Muon tomography is a non-destructive imaging technique that exploits cosmic-ray muons from multiple directions. Its performance critically depends on the stability, active-area coverage, and spatial resolution of position-sensitive detectors. In this work, we report on the development of four compact scintillating fiber modules, each 100 cm long and composed of two staggered layers of 1 mm diameter fibers. The fibers are read out at one end by one-dimensional silicon photomultiplier arrays with a 2 mm pitch, coupled to Citiroc 1A-based front-end electronics. The modules were characterized with cosmic-ray muons, yielding a detection efficiency above 97% and a mean spatial resolution of about 0.56 mm, with uniform response over different distances from the readout end. An imaging test of a lead block was also performed, and the reconstructed results are consistent with the blocks profile. These results demonstrate the suitability of this detector design for compact and large-area systems in muon tomography applications.
@article{arxiv.2509.14674,
title = {Performance evaluation of compact plastic scintillating fiber modules for muon tomography applications},
author = {Yiyue Li and Huiling Li and Hui Liang and Cong Liu and Chenghan Lv and Hongbo Wang and Weiwei Xu},
journal= {arXiv preprint arXiv:2509.14674},
year = {2025}
}