A short-time fading study of Al2O3:C. (January 2015)

• Record Type: Journal Article
• Authors: Nascimento, L.F.; Vanhavere, F.; Silva, E.H.; Deene, Y. De
• Is Part Of: Radiation physics and chemistry. Volume 106(2015:Jan.)
• Page Start: 26
• Page End: 32
• Publication Date: 2015-01
• Subjects: Optically stimulated luminescence -- Al2O3:C -- Fading -- Dosimetry; Radiation chemistry -- Periodicals; Radiometry -- Periodicals; Radiation -- Periodicals; Chimie sous rayonnement -- Périodiques; 539.2
• DOI: 10.1016/j.radphyschem.2014.06.032
• Languages: English
• ISSNs: 0969-806X

Abstract

Abstract: This paper studies the short-time fading from Al2 O3 :C by measuring optically stimulated luminescence (OSL) signals (Total OSL: T OSL, and Peak OSL: P OSL ) from droplets and Luxel™ pellets. The influence of various bleaching regimes (blue, green and white) and light power is compared. The fading effect is the decay of the OSL signal in the dark at room temperature. Al2 O3 :C detectors were submitted to various bleaching regimes, irradiated with a reference dose and read out after different time spans. Investigations were carried out using 2 mm size droplet detectors, made of thin Al2 O3 :C powder mixed with a photocured polymer. Tests were compared to Luxel™-type detectors (Landauer Inc.). Short-time post-irradiation fading is present in OSL results ( T OSL and P OSL ) droplets for time spans up to 200 s. The effect of short-time fading can be lowered/removed when treating the detectors with high-power and/or long time bleaching regimes; this result was observed in both T OSL and P OSL from droplets and Luxel™. Highlights: Droplet composed of thin powder of Al2 O3 :C was prepared using a photo-curable polymer. Powder grain sizes ranged from 5 μm to 35 μm. Short-time fading was measured for irradiated samples. Various bleaching regimes and light power was tested. Droplets were compared to a commercially dosimeter, Luxel™.