In the last years our research group has been studying theoretical alternatives for cancer therapy. In particular we have focused on the neutron capture therapy (NCT). For this therapy one needs a neutron source with a minimum flux of 10^8 n/s for the case of epithermal neutrons. Such a neutron source should be able to be online next to a hospital facility, these kind of neutron source are technologically possible today. We have been working on the adaptation of this kind of technology and basically on a neutron compact source. The aforesaid compact neutron source is mainly builded of the following modules: the ion source, the acceleration column, target and the Beam shaping assembly (BSA) also named moderator. One of the problems that one has to solve is the dose calculation due to neutrons coming from compact generators. That is why in this thesis we study the dose distribution in a phantom due to epithermal neutrons. Methods and Materials In order to determine the dose distribution due to epithermal neutrons coming from a D-D reaction we use a phantom to carry out all calculations. For this work a phantom is as a semi-infinite aqueous medium with a flat geometry and a 10 ppm 10B concentration. The distribution dose calculation due to epithermal neutrons is evaluated using the removal-diffusion theory. The dose rates for thermal and epithermal neutrons, boron and gamma radiation have been calculated using 4 different energy groups and kerma factors taken from ICRU 44. Results We have carried out all calculation with an incident normalized neutron flux. In the case of thermal neutrons, we have obtained a maximum boron dose rate of 7,0 x 10^– 7 cGy/s for a deepness of 2,4 cm and a minimum of 1,9 x 10^– 13 cGy/s for a deepness of 2,8 cm. In the case of epithermal neutrons, the obtained dose rate was of 1,9 x 10^ – 10 cGy/s for a deepness of 1,0 cm. Finally, for the gamma radiation the obtained dose rate was of de 2,8 x 10^– 10 cGy/s for a deepness of 1,2 cm. Conclusions We have successfully implement an established methodology to calculate a dose distribution in a phantom for epithermal neutrons in NCT.