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<p>This paper encompasses a detailed study of particle size effects on dose response and trapping parameters of NaLi<sub>2</sub>PO<sub>4</sub> TLD phosphor doped with 0.2&#xa0;mol% of cerium impurity. The material was prepared using solid state diffusion (SSD) method. X-ray diffraction (XRD) patterns were matched with JCPDF file # 98–006-9967 and found that it has orthorhombic crystal structure with space group Pnma (62). The study on effects of particle size on the thermoluminescence (TL) dosimetry characteristics of a phosphor material, such as, sensitivity, TL glow curve structure, dose response, fading, etc., is very important as most of these parameters depend on the particle size. In the present study, the material was crushed and sieved to get varied particle sizes in micrometre ranges and later ball milled for different time intervals in air at room temperature to achieve particles in nanometre&#xa0;sizes. The particle sizes in nanometre ranges were confirmed using transmission electron microscope (TEM) images. The variation of the dosimetry characteristics with particle size were studied and presented here. It is also important to study variations in trapping parameters, especially, in activation energy and frequency factor, with particle size to ascertain whether the surface defects and variation in band gap/activation energy is affecting the luminescence behavior. Though the nanomaterials are little less sensitive than microcrystalline particles, wide dose response (10.0&#xa0;Gy to 10.0&#xa0;kGy), low fading (approx. 8.0% in a couple of weeks) and excellent reusability proves that they are good candidates for dosimetry of high-energy radiations using TL technique.</p>

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Thermoluminescence of NaLi2PO4:Ce3+ TLD phosphor for estimation of high doses of high-energy radiation: effects of particle size

  • 期刊论文

  • 发表日期：

    2025年1月23日

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  • Martina Saran,
  • P. D. Sahare,
  • Neyaz Ali

摘要

This paper encompasses a detailed study of particle size effects on dose response and trapping parameters of NaLi2PO4 TLD phosphor doped with 0.2 mol% of cerium impurity. The material was prepared using solid state diffusion (SSD) method. X-ray diffraction (XRD) patterns were matched with JCPDF file # 98–006-9967 and found that it has orthorhombic crystal structure with space group Pnma (62). The study on effects of particle size on the thermoluminescence (TL) dosimetry characteristics of a phosphor material, such as, sensitivity, TL glow curve structure, dose response, fading, etc., is very important as most of these parameters depend on the particle size. In the present study, the material was crushed and sieved to get varied particle sizes in micrometre ranges and later ball milled for different time intervals in air at room temperature to achieve particles in nanometre sizes. The particle sizes in nanometre ranges were confirmed using transmission electron microscope (TEM) images. The variation of the dosimetry characteristics with particle size were studied and presented here. It is also important to study variations in trapping parameters, especially, in activation energy and frequency factor, with particle size to ascertain whether the surface defects and variation in band gap/activation energy is affecting the luminescence behavior. Though the nanomaterials are little less sensitive than microcrystalline particles, wide dose response (10.0 Gy to 10.0 kGy), low fading (approx. 8.0% in a couple of weeks) and excellent reusability proves that they are good candidates for dosimetry of high-energy radiations using TL technique.