Radiation effects in samarium-doped calcium fluoride |
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| Authors: | GA Royce VK Mathur RJ Abbundi MD Brown JJ Fontanella MC Wintersgill |
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| Institution: | Naval surface Weapons Center, Silver Spring, MD 20910, USA;Physics Department, U.S. Naval Academy, Annapolis, MD 21402, USA |
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| Abstract: | A study was conducted of the effects of gamma radiation on samarium (Sm)-doped calcium flouride (CaF2) crystals. Optical absorption measurements indicate that many of the Sm3+ ions are converted to Sm2+ during irradiation. Heavy doses of 106 rad also modify the trapping structures and enhance certain defects within the crystals. A comparison is provided between unirradiated and heavily irradiated CaF2 crystals with three Sm concentrations: 0.01, 0.1, and 1.0 molar-percent. Thermoluminescence measurements indicate that the crystals with high Sm content provide less luminescence and that the activation energy is less than seen in the 0.01 molar-percent Sm crystals. |
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