[en] Primary and Compton scattered radiation spectra from radioactive source ²⁴¹Am were measured in various geometry and for various targets. Spectral lines intensity of characteristic X-ray radiation (CXR), Compton and Rayleigh scattering are defined. The back scattering peak for a line 59.54 keV was explored. X-ray quanta were registered by the packaged Si detector 300mm and input Al foil 10mm thicknesses. Radiation interaction with targets and detector atoms was simulated in software code GEANT 4 (LE). Simulated spectra, quanta registration efficiency and secondary calculated radiation spectra at 90^o...160^o are compared with experimentally measured energy distributions.