A proton therapy test facility with a beam current lower than 10 nA in average, and an energy up to 85 MeV, has to be sited at the Frascati ENEA Research Center, in Italy. The accelerator is composed by a sequence of linear sections. From the radiation protection point of view the source of radiation for this facility is almost completely located at the final target. Physical and geometrical models of the device have been developed and implemented into a radiation transport computer code based on Monte Carlo method. The main scope is the assessment of the dose rates around the radiation source for supporting the safety analysis. For the assessment was used the FLUKA (FLUktuierende KAskade) computer code [1, 2]. A general purpose tool for the calculation of particle transport and interaction with matter, covering an extended range of applications including proton beam analysis. The models implemented into the code are described and the results are presented. The calculated dose rates are reported at different distances from the target. Considerations about personnel safety are issued and the shielding requirements are anticipated. Copyright © 2014 CC-BY-3.0 and by the respective authors.