Tidarut Vichaidid, Thongchai Soodprasert, Natnalin Sastri, Chutima Oopathum, and Pichet Limsuwan. 2008. “Determination of U, Th and K in Sediments and Fossil Collected from Mae Moh Mine Using Gamma-Ray Spectrometry and Neutron Activation Analysis (NAA)”. Agriculture and Natural Resources 42 (5). Bangkok, Thailand:333-39. https://li01.tci-thaijo.org/index.php/anres/article/view/244616.