http://www.kau.edu.sa/Files/130/Researches/53067_23431.pdf

Nanoparticles of BaSO4:Eu for heavy-dose measurements

Synthesis and characterization of thermoluminescent Li2B4O7 nanophosphor

Nanocrystalline Ba0.97Ca0.03SO4 : Eu having a grain size of 58 nm has been prepared and a comparative study has been done with its corresponding microcrystalline form. The thermoluminescence (TL) glow curve of the nanophosphor has a prominent peak at 161 °C and a very small hump at 225 °C. The TL sensitivity of the nanophosphor is about 0.1 times that of the microphosphor. Kinetics parameters of the TL peaks of the nanophosphor are obtained and are compared with those of the microphosphor. The TL response of the nanophosphor is linear in the dose range 1 Gy–20 KGy, which is much wider than that of its corresponding microcrystalline form. The glow curve shape and structure also do not change in the linear dose range and, since the TL response is linear at higher doses, the nanophosphor is quite well suited for high dose measurements. Photoluminescence emission spectra of the nano- and the microphosphors are also studied and their results correlated with other experimental findings.

Thermoluminescence and photoluminescence study of nanocrystalline Ba0.97Ca0.03SO4 : Eu

Thermoluminescence and photoluminescence of ZrO2 nanoparticles

UV and gamma ray induced thermoluminescence properties of cubic Gd2O3:Er3+ phosphor

Magnesium borate activated by dysprosium (MgB4O7:Dy) is a low-Zeff, tissue-equivalent material that is commonly used for medical dosimetry of ionizing radiations such as gamma and X-rays using the thermoluminescence (TL) technique. Nanocrystals of the same material are produced and their TL characteristics are studied. It is found that the nanocrystalline MgB4O7:Dy with a dopant concentration of 1000 ppm is the most sensitive amongst varying dopant concentrations, with its sensitivity equal to 0.025 times that of the standard phosphor CaSO4:Dy. The glow curve has two peaks at 154 °C and 221 °C. The nanophosphor has very poor sensitivity for low doses up to 10 Gy but beyond this dose the phosphor exhibits a linear response up to 5000 Gy. On increasing the dose further the response first becomes supralinear and then sublinear, finally resulting into saturation. Considering also its low fading particularly under post-irradiation annealing and excellent reusability features, this nanophosphor may be used for high dose (10–5000 Gy) measurements of ionizing radiations. (© 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)

Nanocrystalline MgB4O7:Dy for high dose measurement of gamma radiation

Thermoluminescence (TL) of Ba 0.97 Ca 0.03 SO 4 :Eu phosphor, irradiated with 48 MeV 7 Li ions at different fluences in the range 1 × 10 9 –1 × 10 12 ions/cm 2 , has been studied. The phosphor was prepared by the chemical co-precipitation technique. Its pellets were irradiated using a 16 MV Tandem Van de-Graff type Electrostatic Pelletron Accelerator at Inter-University Accelerator Centre, New Delhi, India. The samples from the same batch were also irradiated with γ-rays from a Cs 137 source for comparative studies. It has been found that the TL glow peak at 460 K, seen prominently in γ-irradiated sample, appeared as a small shoulder at around 465 K in 7 Li 3+ ion irradiated sample, while that observed as a shoulder in the former at 430 K, dominantly appeared in the latter at around 435 K. Trapping parameters of both, ion beam and γ-irradiated materials, were also obtained after the deconvolution of the glow curves and discussed in the paper. The TL response curve of the ion beam irradiated samples has a linear ion beam fluence response over the range 1 × 10 9 –1 × 10 10 ions/cm 2 . This property along with its low fading and simple glow curve structure makes Ba 0.97 Ca 0.03 SO 4 :Eu phosphor a suitable dosimeter for heavy charged particles (HCP).

Thermoluminescence of Ba0.97Ca0.03SO4:Eu irradiated with 48 MeV 7Li ion beam

A highly sensitive thermoluminescence (TL) phosphor based on Ba1−xCaxSO4 : Eu (0 ≤ x ≤ 1) has been prepared using the chemical co-precipitation technique. It has been found that the TL sensitivity of the material changes on varying the value of x with the maximum coming at x = 0.03. For this value of x the sensitivity is even more than that of the commercially available phosphor CaSO4 : Dy (~2.3 times more). Photoluminescence (PL) and XRD studies of the material show that the maximum TL sensitivity obtained at x = 0.03 is due to the conversion of Eu3+ to Eu2+ being highest in this case. Moreover, the phosphor Ba0.97Ca0.03SO4 : Eu has a constant glow curve shape and a linear gamma-ray dose response over the range 0.1–50 Gy which makes it suitable for radiation dosimetry.

https://iopscience.iop.org/article/10.1088/0022-3727/39/9/013/pdf

Thermoluminescence and photoluminescence study of Ba0.97Ca0.03SO4 : Eu

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Nanocrystalline MgB4O7:Dy for high dose measurement of gamma radiation

Thermoluminescence and photoluminescence study of nanocrystalline Ba0.97Ca0.03SO4 : Eu

Thermoluminescence of Ba0.97Ca0.03SO4:Eu irradiated with 48 MeV 7Li ion beam

Thermoluminescence and photoluminescence study of Ba0.97Ca0.03SO4 : Eu