Radial chemical evolution (left) and the disk γ-ray luminosity (right). The results are calculated for the ADAF model for parameters m = 10, α = 0.1, ṁ = 10⁻³, β = 0.5, and the initial solar composition. Left panel: evolution of elements. The light elements and the initial nuclei with mass fraction X_i >  10⁻³ are explicitly shown. Right panel: disk differential luminosities (in units of photons/cm² s MeV) of nuclear γ-rays consisting of resolved γ-ray lines and the continuum composed of superposition of broad nuclear lines, neutron capture radiation, and nuclear bremsstrahlung emission). The curves denoted as (1), (2), and (3) show the disk differential π⁰-decay γ-ray luminosities: curve (1) corresponds to the nominal Maxwellian distribution of particles, curve (2) corresponds to a Maxwellian distribution with a sharp cutoff at E_k = 4kT_i, whereas curve (3) corresponds to the Maxwellian distribution that has a power-law tail with an index p = 2.0 for E_k >  4 kT_i. The luminosity of the thermal electron bremsstrahlung (red dashed line) is also shown. The advection factor for this model is f = 0.86 and the accretion luminosity is L_acc = 1.4 × 10³⁶ erg s⁻¹. The integrated luminosity that the electrons radiate away through bremsstrahlung is L_e = 1.9 × 10³⁵ erg s⁻¹, the luminosity in the nuclear lines and continuum is L_N = 3.3 × 10³¹ erg s⁻¹, and the luminosity of radiation from decays of the secondary π⁰-mesons is L_π = 9.3 × 10³³ erg s⁻¹.