Le Hong Khiem (Institute of Physics of Vietnamese Academy of Science and Technology, Hanoi, Vietnam), Phan Luong Tuan (Hanoi Irradiation Center –Vietnam Atomic Energy Institute, Hanoi, Vietnam), Ha Lan Anh, Nguyen Thi Thu Ha (Institute of Nuclear Science and Technology –Vietnam Atomic Energy Institute, Hanoi, Vietnam).

IBR-2 FLNP JINR