The electronic properties of defect C60 with one or two vacancies, are calculated by using a Hubbard-like Hamiltonian for sp-electrons in the unrestricted Hartree-Fock approximation. Results are given for the cohesive energy and local charge distribution of the different non-equivalent sites. These results might support a possible mechanism to encapsulate atoms in the internal cavities of C60. This mechanism involves the production of C60 molecules with two carbon isotopes A C and B C (A, B = 12,13,14). The molecules A C59 B C1 and A C58 B C2 are separated from the total production and collected in a chamber under partial pressure of the element to be inserted.