Radiotherapy is a component of oncological treatment and develops with the development of biological and technical sciences. The development of biology makes it possible to better understand the mechanisms of ionising radiation on cancerous tumors and healthy tissues. The development of the technique increases the precision of irradiation by minimising side effects in healthy tissues surrounding cancerous tissues. There is preliminary evidence that certain limitations of radiation therapy can be eliminated by the use of radiation in an ultra-short time. Radiation therapy called FLASH requires the use of a dose-emitting device with the order of 40 Gy/s, when traditional radiation sources emit doses of 0.5 – 5 Gy/min. World oncology studies related to FLASH irradiation effects are now at preclinical stage and gradually move to the clinical phase of selected cancers. It is predicted that the new technology in radiotherapy may become a method of treatment of choice for some cancers. The involvement of Polish science in research requires its access to a source of radiation with these parameters, stable, repetitive, with the possibility of conducting its calibration and control. Such sources are not widely present because they are also at the stage of development research. An important element of the R & D infrastructure being built will be the production of portable local radiation shields, which will allow the use of infrastructure in Poznań, in the facilities of the Wielkopolska Oncology Centre (WCO) and in Otwock in the NCBJ. According to the Applicants, building a research stand for FLASH therapy will make it possible to achieve an important goal – to provide infrastructure equipped with an innovative source of electron radiation, which is an achievement of science and technology, allowing Polish science to join: conduct research on a new type of radiotherapy and conduct material research in the field of sterilisation and radiation resistance of materials.