TY JOUR TI Research of 131Cs Radionuclide Production for Brachytherapy with Photonuclear Method KW medical physics KW brachytherapy KW activation KW electron accelerators KW photonuclear reactions KW 131Cs JO Medical Radiology and radiation safety AU Belousov, A.V. AU Zheltonozhskaya, M.V. PY 2019 IS 64 PB Federal Medical Biological Agency of Russia