Validation of calculational determination of ¹⁸O(p,n) secondary neutron field

Cyclotrons used to produce medical isotopes are relatively widespread. Nowadays, it is popular place small and compact accelerators directly in hospitals. This approach simplifies handling of the produced radiopharmaceuticals, but imposes strict radiation safety measures during production. For optimal utilization isotope production cyclotrons, exact knowledge leakage neutron field essential due deep penetration ability high energy neutrons accompanied secondary Our paper presents measurement spectra for various angles from an open target assembly at cyclotron U-120M NPI CAS. These compared with data obtained a IBA Cyclone 18/9 UJV Rez also activation measurements reactions different threshold energies. All were calculations made Monte Carlo codes using both models libraries. The preliminary results show significant disagreement between experiments theoretical predictions. findings could have implications not only nuclear community operators licensing stage.