On additivity of changes in optical properties under simultaneous and separate irradiation with electrons and protons of ZnO powder modified by SiO2 nanoparticles

The change of diffuse reflectance spectra of mZnO (mZnO/nSiO2) micropowder modified by nSiO2 nanoparticles under separate and simultaneous irradiation with 30 keV electrons and 5 keV protons has been studied. Calculations of the additivity coefficient (Cadd), which is determined by the ratio of the values of the sum ∆as a separate irradiation to its values at simultaneous irradiation, have been carried out. It was found that Cadd varies from 0.96 to 0.92 depending on the time of irradiation. Calculations for the time of stay in geostationary orbit for 7 years give the value of Cadd = 0.87. Therefore, during ground tests of such pigment for thermoregulating coatings of spacecraft designed for long flight times it is necessary to carry out joint action of these types of radiation or take into account the values of Cadd. © 2024 ORION Research-and-Production Association. All rights reserved.