Solid State Nuclear Track Detector (SSNTD) is a small piece of polymer most widely used for long monitoring period . It can used for detecting energetic charged particles such as alpha particles.
A minimal search on the internet offers a lot of papers on the question subject. See the references below: https://www.researchgate.net/publication/297710395_New_method_for_determining_the_uranium_and_thorium_distribution_in_volcanic_rock_samples_using_solid_state_nuclear_track_detectors https://www.ias.ac.in/article/fulltext/pram/067/02/0269-0276 https://pdfs.semanticscholar.org/6ac7/6185dcd582e9287f785a54cd570aee87c49c.pdf https://file.scirp.org/pdf/WJNST20120100006_34535760.pdf https://journals.ju.edu.jo/DirasatSci/article/download/650/648 https://www.researchgate.net/publication/243195675_Determination_of_thorium_and_uranium_contents_in_geological_samples_by_using_solid_state_nuclear_track_detectors