Calcium Sulfate Activated by Thulium or Dysprosium for Thermoluminescence Dosimetry

Yamashita, Takuro; Nada, Noora Qotrun; Ōnishi, Hiroshi; Kitamura, Saburo

doi:10.1097/00004032-197108000-00016

Cited by 257 publications

(101 citation statements)

References 1 publication

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“…All the monitoring points have three TLDs (Panasonic Inc., UD-200S), each containing two elements of CaSO 4 :Tm [Yamashita et al, 1971], in a small wooden case, 1.5 m above the ground.…”

Section: Detecting Methods and Measuring Pointsmentioning

confidence: 99%

Observation of gamma‐ray dose increase associated with winter thunderstorm and lightning activity

Torii¹,

Takeishi²,

Hosono³

2002

J. Geophys. ;Res.

110

106

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[1] Increases of environmental gamma-ray dose which seem to originate from lightning activity were observed around a nuclear facility in Japan. Dose increases measured by thermoluminescent dosimeters (TLDs) exposed during a period including a lightning flash were up to about 0.1 mGy. Dose rates indicated by environmental radiation monitors around the facility also increased transiently at that time. From pulse-height analysis of an NaI(Tl) scintillation detector, the photon energy spectrum evaluated by spectral unfolding is continuous with energy up to several MeV, consistent with bremsstrahlung emission from energetic electrons. Furthermore, energy spectra of bremsstrahlung photons emitted from high-energy electrons are obtained by Monte Carlo calculation. These results are discussed in conjunction with observation.

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“…All the monitoring points have three TLDs (Panasonic Inc., UD-200S), each containing two elements of CaSO 4 :Tm [Yamashita et al, 1971], in a small wooden case, 1.5 m above the ground.…”

Section: Detecting Methods and Measuring Pointsmentioning

confidence: 99%

Observation of gamma‐ray dose increase associated with winter thunderstorm and lightning activity

Torii¹,

Takeishi²,

Hosono³

2002

J. Geophys. ;Res.

110

106

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“…Por meio de uma adaptação do método de Yamashita [5] 3 . Esse valor é obtido através de estequiometria.…”

Section: Metodologiaunclassified

Análise termoluminescente de compósitos de CaSO4 ativado com terras raras

2015

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ResumoDesde que a termoluminescência começou a ser aplicada à dosimetria das radiações ionizantes em 1940, diferentes materiais detectores têm sido propostos, sendo o CaSO 4 um dos mais usuais. A motivação deste trabalho foi produzir cristais de CaSO 4 dopados com elementos terras raras como o európio (Eu), o neodímio (Nd) e o túlio (Tm). Também foram produzidos cristais de CaSO 4 :Ag. O interesse na produção desses materiais foi o de investigar outras metodologias de produção de materiais termoluminescentes. Os resultados obtidos mostram que o CaSO 4 :Tm apresenta maior potencial para ser utilizado na dosimetria termoluminescente, pois, embora não sendo o mais intenso, o pico TL em 170°C pode servir como pico dosimétrico. Análises de linearidade mostraram que as respostas TL foram proporcionais às doses absorvidas.Palavras-chave: dosimetria, termoluminescencia, dosímetro termoluminescente. AbstractSince the thermoluminescence started to be applied to the dosimetry of ionizing radiation in 1940 different materials detectors have been proposed, and one of the most common is CaSO 4 . The motivation of this work was to produce crystals of CaSO 4 doped with rare earth elements such as europium (Eu), neodymium (Nd) and thulium (Tm). It was also produced crystals of CaSO 4 :Ag. The interest in the production of these materials was to investigate other methods of production of thermoluminescent materials. The results show that the CaSO 4 :Tm is more suitable for use in the thermoluminescent dosimetry. Although not the most intense peak, the peak at 170 °C could be a dosimetric peak. Analyses showed that all samples have a TL response proportional to the dose absorbed.

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“…RE ion-doped sulfates have been widely used as novel luminescent materials in cathode ray tubes and plasma display panels due to their high luminescence efficiency [6]. In the family of sulfate phosphors, calcium sulfate was one of the most sensitive TL phosphor and it was in fact the first one used to measure ionizing radiation in 1895 [7][8][9][10]. Sodium sulfate was yet another material that has been quite popular among the researchers in this field.…”

Section: Introductionmentioning

confidence: 99%

Influence of Li+ and Dy3+ on structural and thermoluminescence studies of sodium sulfate

Vidya

Lakshminarasappa

2014

Appl. Phys. A

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Na 2 SO 4 , Na 2 SO 4 : Dy 3? , LiNaSO 4 and LiNaSO 4 : Dy 3? nanoparticles successfully synthesized by slow evaporation technique followed by calcination at 400 o C. The resultant products were characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, Fourier transform infrared and UVVis spectroscopy. The average crystallite size was calculated using Debye-Scherrer's formula and WilliamsonHall's (W-H) plots. The optical energy band gap (E g ) was estimated from Wood and Tauc's relation, which varies from 3.70 to 4.45 eV. The variation in band gap values attributed to large degree of structural defects. Thermoluminescence studies were investigated using c-irradiation in the dose range 0.5-5 kGy at a heating rate of 5 K s -1 . The samples Na 2 SO 4 and LiNaSO 4 showed a well-resolved glow peak at *180 and *170°C, respectively. The prominent glow peak at *175°C along with shouldered peak at *60°C was observed for Na 2 SO 4 : Dy 3? . LiNaSO 4 : Dy 3? showed prominent glow peak at *100°C and a small shoulder peak at *180°C. The addition of isovalent (Li ? ) quenches the TL intensity, whereas the hypervalent (Dy 3? ) increases the intensity of Na 2 SO 4 . The variations of TL intensity for all the phosphors follow linear behavior up to 5 kGy and were useful in radiation dosimetry. The kinetic parameters (E, b and s) were estimated from the glow peak shape method.

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Calcium Sulfate Activated by Thulium or Dysprosium for Thermoluminescence Dosimetry

Cited by 257 publications

References 1 publication

Observation of gamma‐ray dose increase associated with winter thunderstorm and lightning activity

Observation of gamma‐ray dose increase associated with winter thunderstorm and lightning activity

Análise termoluminescente de compósitos de CaSO4 ativado com terras raras

Influence of Li+ and Dy3+ on structural and thermoluminescence studies of sodium sulfate

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