Advances in luminescence instrument systems

Date

2000-12-15

Author

Bøtter-Jensen, L.
Bulur, Enver
Duller, G.A.T.
Murray, A.S.

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We report on recent advances in the development of luminescence measurement systems and techniques at Riso. These include: (1) optical stimulation units based on new-generation powerful blue light (470 nm) emitting diodes providing up to 28 mW/cm(2) for OSL measurements; (2) an infrared (830 nm) laser diode unit providing up to 400 mW/cm(2) for stimulation of feldspars; and finally (3) an optical stimulation attachment based on a focused solid stale green (532 nm) laser for rapid OSL measurements of individual sand-sized single grains of a sample. Facilities for hearing samples during beta irradiation and performing linearly modulated OSL measurements have also been incorporated into the system.

Subject Keywords

Optically stimulated luminescence, Quartz

URI

https://hdl.handle.net/11511/46352

Journal

Radiation Measurements

DOI

https://doi.org/10.1016/s1350-4487(00)00039-1

Collections

Department of Physics, Article

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Design and construction of an automated OSL reader with open source software and hardware MARABA, Diren; Bulur, Enver (2017-11-01) An Optically Stimulated Luminescence (OSL) reader accompanying a sample changer unit for multi sample measurements was designed and constructed so that consecutive automated luminescence measurements can be performed. The reader was realized using open source software and hardware to minimize the development costs. The core control system of the reader is an open source single-board microcontroller (Arduino DUE). The control of sample positioning mechanism, stimulation system, precise timing and photon coun...
Simple transformation for converting CW-OSL curves to LM-OSL curves Bulur, Enver (2000-01-01) A simple mathematical transformation is introduced to convert from OSL decay curves obtained in the conventional way to those obtained using a linear modulation technique based on a linear increase of the stimulation light intensity during OSL measurement. The validity of the transformation was tested by the IR-stimulated luminescence curves from feldspars, recorded using both the conventional and the linear modulation techniques. The transformation was further applied to green-light-stimulated OSL from K a...
Use of the LM-OSL technique for the detection of partial bleaching in quartz Agersnap Larsen, N.; Bulur, Enver; Bøtter-Jensen, L.; McKeever, S.W.S. (2000-12-15) We present a study of the sensitivity to light (ease-of-bleaching) of the trapped charge in sedimentary quartz grains using an optically stimulated luminescence (OSL) technique in which the intensity of the stimulation light is linearly increased during the measurement period. The technique is known as linear modulation OSL (LM-OSL). In controlled laboratory conditions, this technique has been employed to study the ease-of-bleaching of the trapped charge in quartz by comparing the OSL curves of quartz aliqu...
Frequency modulated pulsed stimulation in optically stimulated luminescence Bulur, Enver; Murray, A.S. (2001-01-01) A new pulsed-OSL stimulation unit capable of producing stimulation pulses down to 4 us wide has been developed. A matrix of 49 light emitting diodes (LEDs) are pulsed using a voltage-to-frequency converter, which produces fixed width pulses of adjustable duty cycle in the frequency range 0-10 kHz. Since the average light power falling on a sample is proportional to the repetition rate of the pulses, we have used voltage control of the frequency to undertake linearly modulated optically stimulated luminescen...
LM-OSL from single grains of quartz: A preliminary study Bulur, Enver; SOLONGO, S; Bøtter-Jensen, L.; Murray, A.S. (2002-01-01) The recently developed single grain attachment for the Riso TL-OSL reader has been modified to achieve linearly modulated optically stimulated luminescence (LM-OSL). Three different types of luminescence behaviour were observed in 81 quartz grains measured. These types are those showing only the easy-to-bleach component, those with only the hard-to-bleach component, and those exhibiting all components. The results of this preliminary study show that LM-OSL experiments carried out at the single grain level m...

Citation Formats

L. Bøtter-Jensen, E. Bulur, G. A. T. Duller, and A. S. Murray, “Advances in luminescence instrument systems,” Radiation Measurements, pp. 523–528, 2000, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/46352.