Radiation-induced changes in the optical properties of NaMgF3(Sm): Observation of resettable Sm radio-photoluminescence
- The MacDiarmid Institute for Advanced Materials and Nanotechnology, SCPS, Victoria University of Wellington, PO Box 600, Wellington 6140 (New Zealand)
Highlights: • NaMgF{sub 3}(Sm) shows photoluminescence from Sm{sup 3+} and Sm{sup 2+}. • Optically stimulated luminescence occurs via Sm{sup 3+}. • Stable valence conversion from Sm{sup 3+} to Sm{sup 2+} is induced by X-ray irradiation. • The Sm valence ratio can be used to non-destructively measure doses up to ∼500 Gy. • The Sm valence conversion can be reversed by deep UV stimulation. - Abstract: Stable radio-photoluminescence (RPL) is observed in NaMgF{sub 3}(Sm) after X-ray irradiation due to valence conversion of Sm{sup 3+} to Sm{sup 2+}. This valence conversion can be reversed by deep UV (254 nm) illumination. It is likely that this reversible process occurs via defects near some of the Sm{sup 3+} sites that act as hole traps. The ratio of the Sm{sup 2+}/Sm{sup 3+} RPL emissions follows an exponential-type curve dependence on X-ray dose where the ratio saturates above ∼500 Gy. Optically stimulated luminescence (OSL) is also observed but only from Sm{sup 3+} and primarily from electrons trapped at F-centers. The OSL response is demonstrated to be linear up to 100 Gy. Thus, NaMgF{sub 3}(Sm) has potential as a dosimeter where individual irradiations can be monitored via OSL and the total cumulative dose via non-destructive RPL readout. The RPL can be optically reset when required.
- OSTI ID:
- 22805263
- Journal Information:
- Materials Research Bulletin, Vol. 106; Other Information: Copyright (c) 2017 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
- Country of Publication:
- United States
- Language:
- English
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