Accession Number : AD0680565

Title :   ABOUT RADIATION PERTURBATIONS IN RADIOACTIVE AND GAMMA-IRRADIATED CaSO4, SrSO4, BaSO4, SAMPLES,

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Gromov,V. V. ; Karaseva,L. G.

Report Date : 24 MAY 1968

Pagination or Media Count : 8

Abstract : Electron paramagnetic resonance was used to study the transformations occurring in a crystal lattice of Alkali-earth sulfates under the influence of beta radiation from 35S introduced into these compounds. Also investigated were nonradioactive samples of the same salts irradiated with gamma rays from 60Ca. The tests consisted essentially of determining the accumulation of paramagnetic centers in the radioactive sulfates, determining the concentration of the paramagnetic centers as a function of the specific radioactivity, and measuring the annealing of the paramagnetic centers in the irradiated sulfates. The results show that the higher the level of the specific radioactivity of the salt, the more rapidly equilibrium is attained in the formation of the paramagnetic centers. The paramagnetic-center concentration increases with radioactivity but eventually attains saturation. It is concluded from the results that irradiation produces in the investigated salts localized unpaired electrons, which remain stable up to certain temperatures. The most stable EPR signal is found to be due to the radical SO3(-). The asymmetry of the observed EPR line is attributed to the radical SO4(-), which has a three-axis anisotropy of paramagnetic susceptibility.

Descriptors :   (*SULFATES, PARAMAGNETIC RESONANCE), (*RADIOACTIVE ISOTOPES, SULFATES), (*ALKALINE EARTH COMPOUNDS, *PARAMAGNETIC RESONANCE), CRYSTAL LATTICES, GAMMA RAYS, BETA PARTICLES, PARAMAGNETIC MATERIALS, EQUILIBRIUM(PHYSIOLOGY), ANISOTROPY, SYMMETRY(CRYSTALLOGRAPHY), BARIUM COMPOUNDS, STRONTIUM COMPOUNDS, CALCIUM COMPOUNDS, USSR

Subject Categories : Physical Chemistry
      Radiation and Nuclear Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE