Article

Influence of the irradiation temperature on the dosimetric and high temperature TL peaks of Al2O3:C.

LPES-CRESA, EA1174, Université de Nice-Sophia, Antipolis, France.
Radiation Protection Dosimetry (impact factor: 0.82). 02/2002; 100(1-4):139-42. pp.139-42
Source: PubMed

ABSTRACT The TL glow curves of Al2O3:C crystals have been investigated as a function of the irradiation temperature. The nature of the observed TL peaks has been studied by optical annealing. The filling of traps was found strongly dependent on the irradiation temperature in the case of UV exposure, which has been explained by the temperature dependence of the photoionisation of F centres. This latter phenomenon could have a part in the luminescence quenching and UV bleaching of F centres.

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    Article: Superlinear dose dependence of high temperature thermoluminescence peaks in Al2O3:C.
    D Lo, J L Lawless, R Chen
    [show abstract] [hide abstract]
    ABSTRACT: We report on strong superlinearity of high temperature (300-700 degrees C) thermoluminescence (TL) peaks in alpha-Al2O3:C powder. The main dosimetric peak at approximately 200 degrees C, previously found to exhibit slight superlinearity, is now shown to yield a slope of approximately 1.15 on a log(intensity) vs. log(dose) curve. Higher temperature peaks at approximately 320, 450 and 650 degrees C, previously reported following UV and X-ray excitation, have now been observed after beta irradiation and showed stronger superlinearity. Using a blue filter, the weak peak at approximately 320 degrees C started about quadratically and the slope on the log-log scale decreased gradually from 2 to about unity at approximately 100 Gy. The two higher temperature peaks at approximately 450 and approximately 650 degrees C also exhibited a strong superlinear dose dependence in this dose range, with an average slope of approximately 2. Roughly similar behaviour has been found when a UV filter was used. The possible explanation of the strong superlinearity is discussed.
    Radiation Protection Dosimetry 02/2006; 119(1-4):71-4. · 0.82 Impact Factor
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.

Keywords

irradiation temperature
 
luminescence quenching
 
observed TL peaks
 
optical annealing
 
photoionisation
 
TL glow curves
 
traps