[en] The luminescence techniques have evolved over the last 40 years to a powerful dating instrument in archaeology and geoscience. Depending on how the luminescence is stimulated, one distinguishes the phenomena of thermoluminescence (TL), optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL). Each of these phenomena has its specific potential for dating various archaeological materals in the time range from medieval back to palaeolithic periods, or, speaking in geological terms, for dating of Holocene and late Pleistocene objects. The OSL and IRSL techniques are sometimes treated together as 'optical dating'. The luminescence techniques differ from other major dating techniques, such as ¹⁴C, essentially by their applicability to inorganic materials, their wide age-range from about 100 years to more than 100,000 years and the kind of datable events which are the last exposure to heat or to light. (author). 10 refs., 3 figs

No abstract available

[en] The age equation sets luminescence dating as a method of absolute dating. However, it is also characterized by the introduction of a large number of uncertainties. To assess these uncertainties, we decided to proceed under a Bayesian approach. The Bayesian approach is characterized by the formalization of the initial assumptions (prior). Thus, this approach can test the relevance of the different (expressed or implied) assumptions used to assess the dose. In the present communication, we focus on the relationship between the accumulated dose and the luminescence measurements in two cases: single aliquot regeneration and multiple aliquots additive dose methods. The aim is to see how the Bayesian approach can reduce the use of arbitrary criteria. - Highlights: • Bayesian approach is used to assess uncertainties in luminescence dating. • We focus on the relationship between the dose and the luminescence measurements. • OSL-SAR and TL-MAAD methods were investigated. • A model is presented for TL-MAAD, focussing on the plateau and the robustness to outliers.

[en] The luminescence techniques have evolved over the last 40 years to a powerful dating instrument in archaeology and geoscience. Depending on how the luminescence is stimulated, one distinguishes the phenomena of thermoluminescence (TL), optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL). Each of these phenomena has its specific potential for dating various archaeological materals in the time range from medieval back to palaeolithic periods, or, speaking in geological terms, for dating of Holocene and late Pleistocene objects. The OSL and IRSL techniques are sometimes treated together as 'optical dating'. The luminescence techniques differ from other major dating techniques, such as ¹⁴C, essentially by their applicability to inorganic materials, their wide age-range from about 100 years to more than 100,000 years and the kind of datable events which are the last exposure to heat or to light. (author). 10 refs., 3 figs

[en] The luminescence techniques have evolved over the last 40 years to a powerful dating instrument in archaeology and geoscience. Depending on how the luminescence is stimulated, one distinguishes the phenomena of thermoluminescence (TL), optically stimulated luminescence (OSL) and infrared stimulated luminescence (IRSL). Each of these phenomena has its specific potential for dating of Holocene and late Pleistocene objects. The OSL and IRSL techniques are sometimes treated together as 'optical dating'. The luminescence techniques differ from other major dating techniques, such as ¹⁴C, essentially by their applicability to inorganic materials, their wide age-range from about 100 years to more than 100,000 years and the kind of datable events which are the last exposure to heat or to light. (author). 10 refs., 3 figs

[en] An air bubble trapped in water by an oscillating acoustic field undergoes either spherical or nonspherical pulsations depending on the strength of the forcing pressure. Two different instability mechanisms (the Rayleigh-Taylor instability and parametric instability) cause deviations from sphericity. Distinguishing these mechanisms allows an explanation of many features of recent experiments on single bubble sonoluminescence, and suggests methods for finding sonoluminescence in different parameter regimes

[en] Luminescence dating of sediments requires the determination of two quantities: the equivalent radiation dose to which the sample has been exposed since the event that is being dated; and the radiation dose to which it is exposed per year. Dividing one quantity by the other gives the age of the sample. Over the past four years a new group of methods has been developed for the determination of the equivalent dose of a sample. These are collectively known as ''single aliquot'' methods since, in contrast to standard luminescence methods, all the measurements are made on one aliquot of the sample. This has considerable practical advantages in terms of precision and the speed of analysis. In addition to being an alternative to standard methods of luminescence dating, the new methods are able to identify poorly bleached samples and to work on small samples which could not practically be analysed by conventional methods. The most exciting prospect is the ability to date individual sediment grains, between about 100 and 300 μm in diameter. The different single aliquot methods are described and examples given of their application to specific sites. (Author)

[en] Existing dental radiographic systems have used analog X-ray films. In trend of digital radiography we developed and tested dental computed radiographic system. No image is obtained from prototype dental computed radiographic system, so we analyze the cause of that. And it is believed that photostimulated luminescence from PSP plate is not collected sufficiently. Therefore we developed mathematical model of light collection with solid angle, and calculated light collection efficiency. Prototype has much low light collection efficiency. To acquire image, new light collector is designed and it is believed that new collector has larger light collection efficiency than that of prototype

[en] The present comment concerns the correct presentation of the equations giving the CW-OSL intensity in the case of second- and general-order kinetics. Those equations have also been published with their wrong formulation in two eminent books in their topic. Since most researchers (especially early stage) would use directly the proposed functions as published in the various sources, they should be notified of their correct formulation. (authors)

[en] We have designed and developed novel luminescent lanthanide complexes for advanced photonics applications. Lanthanide(III) ions (Ln"3"+) were encapsulated by the luminescent ligands such as metalloporphyrins and naphthalenes. The energy levels of the luminescent ligands were tailored to maintain the effective energy transfer process from luminescent ligands to Ln"3"+ ions for getting a higher optical amplification gain. Also, key parameters for emission enhancement and efficient energy transfer pathways for the sensitization of Ln"3"+ ions by luminescent ligands were investigated. Furthermore, to enhance the optophysical properties of novel luminescent Ln"3"+ complexes, aryl ether-functionalized dendrons as photon antennas have been incorporated into luminescent Ln3+ complexes, yielding novel Ln(III)-cored dendrimer complex. The novel Ln(III)-cored dendrimer complex has much higher PL intensity than the corresponding simple complex, due to the efficient site-isolation effect. In this article, we will deal with recent progress in the synthesis and photophysical studies of inert and stable luminescent Ln"3"+ complexes for advanced photonics applications. Also, our review will include the exploratory investigation of the key parameters for emission enhancement and the effective energy transfer pathways from luminescent ligands to Ln"3"+ ions with Ln(III)- chelated prototype complexes