Accession Number:

AD0650121

Title:

EFFECTS OF GAMMA IRRADIATION ON URANIUM DOPED CALCIUM FLUORIDE.

Descriptive Note:

Final scientific rept. (Part II) 8 Oct 65-7 Dec 66,

Corporate Author:

NORTH CAROLINA STATE UNIV RALEIGH PHYSICAL SCIENCE RESEARCH

Personal Author(s):

Report Date:

1966-12-01

Pagination or Media Count:

65.0

Abstract:

The effects of Co60 and Cs137 gamma radiation on the 0.2 microns to 1.1 microns spectral region of CaF2U3 were studied. Radiation induced absorption bands formed at 0.320, 0.405, and 0.595 micron appear to be the results of three distinct types of centers. The shape of the band at 0.595 micron indicates that there may be several composite bands in this region. The energy levels of these bands lie between 14,000cm and 18,000cm which is just above the quadruplet-I152 levels of the imperturbed uranium ions. Decay of the radiation induced center band spectrum due to time and due to optical bleaching with an FX 38A linear flash tube was investigated. The 0.320 micron band decayed less than 15 per cent under flashing, while the 0.405 micron band fell approximately 55 per cent, and the 0.595 micron band fell approximately 45 per cent. The effect of gamma radiation on the laser output of a CaF2U3 rod was examined with the help of new low temperature head which could be placed into the sample compartment of the Co60 irradiator. An increase of 250 per cent was observed over the unirradiated output. Author

Subject Categories:

  • Lasers and Masers
  • Solid State Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE