Investigation and assessment of radioactivity background around the coal-fired power plant at Duyen Hai commune, Tra Vinh province - Vu, Ba; Huynh, Phong Thu; Nguyen, Thang; Huynh, Phuong; Vo, Hai; Le, Thuyen; Truong, Hong Loan (VNUHCM Journal of Advanced Research in Natural Sciences, 2022)