The measurements were performed by a nuclear track etched detectors LR-115 associated with the converter (radiator that consist of 10B and with the active neutron detector Thermo BIOREM FHT 742. Two of the rooms were reconstructed after decommissioning of 60Co units, so the main limitation was the space. The neutron dose equivalent around high energy medical electron linear acceleratorsĭirectory of Open Access Journals (Sweden)įull Text Available The measurement of neutron dose equivalent was made in four dual energy linear accelerator rooms. It was found that the semi-empirical equations underestimate the simulated neutron doses in the majority of the cases, if compared to the simulated values, suggesting that these equations must be revised, due to the increasing number of high energy machines in the country. The simulated neutron dose equivalents varied between 2 e 26 μ Sv/Gy RX, and the results were compared with calculations performed with the use of some semi-empirical equations found in literature.
![formation logiciel allplan formation logiciel allplan](https://i.imgur.com/KsnAH72.jpg)
In this work, MCNP simulation was undertaken to examine the neutron equivalent doses around the accelerators head and at the entrance of medical linear accelerators treatment rooms, some of them licensed in Brazil by the National Regulatory Agency (CNEN). Although desirable in the therapeutic point of view, the increase in photon energies causes the generation of undesired neutrons, which are produced through nuclear reactions between photons and the high Z target nuclei of the materials that constitute the accelerator head. Medical linear accelerators, with maximum photon energies above 10 MeV, are becoming of common use in Brazil. Soares, Alessandro Facure Neves de Salles International Nuclear Information System (INIS) Occupational doses due to photoneutrons in medical linear accelerators rooms