**Figure 4.**

*3D-color map of absorbed dose distribution throughout the water phantoms: (a) parallelepiped with the edge of 6 cm, (b) 6 cm sphere, and (с) 6 cm cylinder with the height of 6 cm during unilateral 10 MeV electron irradiation.*

(**Figure 4a**). It is interesting that the layers of the parallelepiped close to the edges are underexposed. When a sphere is irradiated with 10 MeV electrons the layers of the sphere close at the equator are clearly overexposed (**Figure 4b**). In the cylinder, overexposure can be observed on the lateral sides of the surface while the character of depth dose distribution is similar to that of the parallelepiped (**Figure 4c**). When irradiating from one side, all the shapes are partly underexposed the maximum electron penetration depth is lower compared to the linear dimensions of the objects.

It can be concluded that not only the electron energy, but also the properties of the object—density, chemical composition, and shape—have an impact on the distribution of absorbed dose throughout the object. Since biological objects have nonhomogeneous density, complex shapes, and chemical composition, it is necessary to take an individual approach to establish the dose distribution for various objects.
