The first experimental batch of lutetium-177 trichloride has been obtained at Tomsk Polytechnic University research reactor. This is an extremely effective basis for therapeutic radiopharmaceuticals. All lutetium-177 isotopes produced in the world are obtained with the impurity of lutetium-176m which emits hard gamma radiation and affects healthy tissues in the patient’s body. Tomsk scientists succeeded to solve the most difficult problem and obtain ‘pure’ lutetium-177 without harmful impurities out of other source material. The experimental batch has been already sent for the external examination and certification at the Center for Molecular Research (Moscow). Lutetium-177 trichloride samples were presented to Tomsk Oblast Governor Sergey Zhvachkin who is also the chairperson of TPU Supervisory Board.