Kaewtubtim, P., Phansuke, P., Lakkiang, M. and Ruengrung, S. 2026. Quantitative Analysis of Ra-226, K-40 and Th-232 in Sediment from Rivers and Canals at Surat Thani Province. Burapha Science Journal. 26, 3 September-December (Mar. 2026), 1762–1776.