Sumaneev, O.V. Azhgirey, I.L. Bayshev, I.S. Pikalov, V.A. JACoW Publishing Geneva, Switzerland 2673-5539 978-3-95450-240-0 10.18429/JACoW-RuPAC2021-FRC01 English 129-131 neutron simulation experiment synchrotron radiation Contribution to a conference proceedings 2021 2021-10 https://doi.org/10.18429/JACoW-RuPAC2021-FRC01 https://jacow.org/rupac2021/papers/frc01.pdf Neutron monitors with gas filled proportional counters as a sensitive element were presented at RuPAC-2018. These monitors have been used recently to measure fast neutron fluxes near the carbon beam based experimental facility at IHEP. The experimental facility "Radiobiological test setup at the U-70 accelerator" was built at NRC "Kurchatov Institute" - IHEP, Protvino, to carry out radiobiological and physical experiments on the extracted beam of carbon nuclei with an energy up to 450 MeV/nucleon. The measurements were compared with the CERN FLUKA code simulations.