Photoluminescence and thermal stability of 5.5 eV and Ti centres in gamma irradiated LiF:Mg, Ti crystals

V. Chernov; T. M. Piters; E. Okuno; E. M. Yoshimura

doi:10.1016/S1350-4487(01)00108-1

Photoluminescence and thermal stability of 5.5 eV and Ti centres in gamma irradiated LiF:Mg, Ti crystals

V. Chernov, T. M. Piters, E. Okuno, E. M. Yoshimura

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Abstract

Photoluminescence (PL) and thermoluminescence (TL) measurements of LiF:Mg, Ti (DTG-4) single crystals, previously gamma irradiated with 500 Gy and thermally treated, were performed. The behaviour of the Mg centres, related to the known 5.5 eV optical absorption band, PL emission after repeated heating cycles with a heating rate of 1 K/s up to 373-653 K indicate that these centres are created simultaneously with the destruction of TL peaks. The decay of the PL emission after repeated heating cycles followed by 10 min annealing at 643 K coincides with the decreasing of the TL sensitisation factors of peaks 2, 3 and 5. Both these facts support the point of view that the precursors of the 5.5 eV centres act as competitive traps during TL readout. The behaviour of the Ti-related PL emission was found to be unexpectedly complex. Noticeable change of the Ti band shape and ambiguous behaviour of the Ti emission during subsequent heating indicate the possible presence of an additional Ti band. © 2001 Elsevier Science Ltd.

Original language	American English
Pages (from-to)	793-796
Number of pages	4
Journal	Radiation Measurements
DOIs	https://doi.org/10.1016/S1350-4487(01)00108-1
State	Published - 1 Jan 2001

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@article{69176ad02a554a978445e9f96a23a878,

title = "Photoluminescence and thermal stability of 5.5 eV and Ti centres in gamma irradiated LiF:Mg, Ti crystals",

abstract = "Photoluminescence (PL) and thermoluminescence (TL) measurements of LiF:Mg, Ti (DTG-4) single crystals, previously gamma irradiated with 500 Gy and thermally treated, were performed. The behaviour of the Mg centres, related to the known 5.5 eV optical absorption band, PL emission after repeated heating cycles with a heating rate of 1 K/s up to 373-653 K indicate that these centres are created simultaneously with the destruction of TL peaks. The decay of the PL emission after repeated heating cycles followed by 10 min annealing at 643 K coincides with the decreasing of the TL sensitisation factors of peaks 2, 3 and 5. Both these facts support the point of view that the precursors of the 5.5 eV centres act as competitive traps during TL readout. The behaviour of the Ti-related PL emission was found to be unexpectedly complex. Noticeable change of the Ti band shape and ambiguous behaviour of the Ti emission during subsequent heating indicate the possible presence of an additional Ti band. {\textcopyright} 2001 Elsevier Science Ltd.",

author = "V. Chernov and Piters, {T. M.} and E. Okuno and Yoshimura, {E. M.}",

year = "2001",

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doi = "10.1016/S1350-4487(01)00108-1",

language = "American English",

pages = "793--796",

journal = "Radiation Measurements",

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TY - JOUR

T1 - Photoluminescence and thermal stability of 5.5 eV and Ti centres in gamma irradiated LiF:Mg, Ti crystals

AU - Chernov, V.

AU - Piters, T. M.

AU - Okuno, E.

AU - Yoshimura, E. M.

PY - 2001/1/1

Y1 - 2001/1/1

N2 - Photoluminescence (PL) and thermoluminescence (TL) measurements of LiF:Mg, Ti (DTG-4) single crystals, previously gamma irradiated with 500 Gy and thermally treated, were performed. The behaviour of the Mg centres, related to the known 5.5 eV optical absorption band, PL emission after repeated heating cycles with a heating rate of 1 K/s up to 373-653 K indicate that these centres are created simultaneously with the destruction of TL peaks. The decay of the PL emission after repeated heating cycles followed by 10 min annealing at 643 K coincides with the decreasing of the TL sensitisation factors of peaks 2, 3 and 5. Both these facts support the point of view that the precursors of the 5.5 eV centres act as competitive traps during TL readout. The behaviour of the Ti-related PL emission was found to be unexpectedly complex. Noticeable change of the Ti band shape and ambiguous behaviour of the Ti emission during subsequent heating indicate the possible presence of an additional Ti band. © 2001 Elsevier Science Ltd.

AB - Photoluminescence (PL) and thermoluminescence (TL) measurements of LiF:Mg, Ti (DTG-4) single crystals, previously gamma irradiated with 500 Gy and thermally treated, were performed. The behaviour of the Mg centres, related to the known 5.5 eV optical absorption band, PL emission after repeated heating cycles with a heating rate of 1 K/s up to 373-653 K indicate that these centres are created simultaneously with the destruction of TL peaks. The decay of the PL emission after repeated heating cycles followed by 10 min annealing at 643 K coincides with the decreasing of the TL sensitisation factors of peaks 2, 3 and 5. Both these facts support the point of view that the precursors of the 5.5 eV centres act as competitive traps during TL readout. The behaviour of the Ti-related PL emission was found to be unexpectedly complex. Noticeable change of the Ti band shape and ambiguous behaviour of the Ti emission during subsequent heating indicate the possible presence of an additional Ti band. © 2001 Elsevier Science Ltd.

U2 - 10.1016/S1350-4487(01)00108-1

DO - 10.1016/S1350-4487(01)00108-1

M3 - Article

SP - 793

EP - 796

JO - Radiation Measurements

JF - Radiation Measurements

SN - 1350-4487

ER -

Photoluminescence and thermal stability of 5.5 eV and Ti centres in gamma irradiated LiF:Mg, Ti crystals

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