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Coprecipitation synthesis and thermoluminescence characterization of LiF:Cu phosphors: low-dose response and short-term fading study.

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Title:	Coprecipitation synthesis and thermoluminescence characterization of LiF:Cu phosphors: low-dose response and short-term fading study.
Authors:	Kartikasari, Dewi^1,2 (AUTHOR), Lestari, Adinda¹ (AUTHOR), Nuraeni, Nunung² (AUTHOR), Aritonang, Sovian³ (AUTHOR), Kurniawan, Budhy¹ (AUTHOR) budhy.kurniawan@sci.ui.ac.id
Source:	Journal of Radioanalytical & Nuclear Chemistry. Apr2026, Vol. 335 Issue 4, p2761-2772. 12p.
Subject Terms:	Thermoluminescence, Dose-response relationship (Radiation), Phosphors, Medical dosimetry, Activation energy, Coprecipitation (Chemistry), *Copper ions
Abstract:	Copper-doped lithium fluoride (LiF:Cu) phosphors (0.1–1.0 mol% Cu) were synthesized by a coprecipitation method and evaluated for low-dose thermoluminescence (TL) under 90Sr/90Y β-irradiation in the range of 10–40 mGy. X-ray diffraction confirmed retention of the cubic LiF phase with slight peak shifts upon Cu incorporation, while SEM–EDS verified the presence of Cu in the doped powders. All LiF:Cu compositions exhibited a dominant dosimetric glow peak in the 150–220 °C range. The TL dose response was approximately linear for all doped samples; among the investigated compositions, LiF:Cu (0.1 mol%) exhibited the highest TL output and the best linearity based on linear regression fitting (R2 = 0.9969), followed by LiF:Cu (1.0 mol%) (R2 = 0.8952) and LiF:Cu (0.5 mol%) (R2 = 0.7717), whereas undoped LiF remained near the measurement background (R2 = 0.3141). The reported TL responses are presented as mean ±1 SD, where the error bars represent the standard deviation obtained from three independently prepared aliquots per dose point (n = 3). Peak-shape analysis yielded apparent activation energies in the range of 0.88–1.03 eV. Short-term fading was evaluated using the normalized integrated TL signal (I/I₀) over 50–300 °C during 7 days of storage at room temperature. After 7 days, I/I₀ values were 0.5123, 0.7255, and 0.8603 for 0.1, 0.5, and 1.0 mol% Cu, respectively (undoped LiF: 0.7594), indicating a sensitivity–stability trade-off under the present synthesis and readout conditions, relevant to prompt-readout low-dose TL dosimetry. [ABSTRACT FROM AUTHOR]
Database:	Energy & Power Source

Description
Abstract:	Copper-doped lithium fluoride (LiF:Cu) phosphors (0.1–1.0 mol% Cu) were synthesized by a coprecipitation method and evaluated for low-dose thermoluminescence (TL) under 90Sr/90Y β-irradiation in the range of 10–40 mGy. X-ray diffraction confirmed retention of the cubic LiF phase with slight peak shifts upon Cu incorporation, while SEM–EDS verified the presence of Cu in the doped powders. All LiF:Cu compositions exhibited a dominant dosimetric glow peak in the 150–220 °C range. The TL dose response was approximately linear for all doped samples; among the investigated compositions, LiF:Cu (0.1 mol%) exhibited the highest TL output and the best linearity based on linear regression fitting (R2 = 0.9969), followed by LiF:Cu (1.0 mol%) (R2 = 0.8952) and LiF:Cu (0.5 mol%) (R2 = 0.7717), whereas undoped LiF remained near the measurement background (R2 = 0.3141). The reported TL responses are presented as mean ±1 SD, where the error bars represent the standard deviation obtained from three independently prepared aliquots per dose point (n = 3). Peak-shape analysis yielded apparent activation energies in the range of 0.88–1.03 eV. Short-term fading was evaluated using the normalized integrated TL signal (I/I₀) over 50–300 °C during 7 days of storage at room temperature. After 7 days, I/I₀ values were 0.5123, 0.7255, and 0.8603 for 0.1, 0.5, and 1.0 mol% Cu, respectively (undoped LiF: 0.7594), indicating a sensitivity–stability trade-off under the present synthesis and readout conditions, relevant to prompt-readout low-dose TL dosimetry. [ABSTRACT FROM AUTHOR]
ISSN:	02365731
DOI:	10.1007/s10967-026-10805-3