Nguyen, Son, Lanh Dang, and Minh Truong. 2015. “Determination of Relative and Absolute Efficiency Functions in the Range of 122 KeV ÷ 8.5 MeV of HPGe Detector”. Science and Technology Development Journal 18 (2), 79-87. https://doi.org/https://doi.org/10.32508/stdj.v18i2.1135.