Irradiation effects were investigated in zircon crystals by methods of optical absorption and luminescence. Special attention was given to the effects of vacuum ultraviolet (VUV) radiation. The same main thermoluminescence (TL) peaks with the same thermal activation energies appeared after VUV as after X- or beta irradiation, indicating that the same traps were induced by the different irradiat...

In this study the dosimetric properties of alumina (Al2O3) substrates found in resistors retrieved from mobile phones were investigated. Measurements of the decline of optically stimulated luminescence (OSL) generated following exposure of these substrates to ionising radiation showed that 16% of the signal could still be detected after 2 years (735 days). Further, the magnitude of the regenera...

Onyx samples were studied in this work to verify their dosimetric properties. The Onyx stone is considered nobler than marble. At IPEN, the radiation metrology group has studied new materials for application in highdose dosimetry. The Onyx samples were exposed using a Gamma-Cell 220 system ( 60 Co), for doses of 50 Gy up to 300 kGy. The lower detection doses, the reproducibility of the OSL resp...

The growing importance of VLSI is getting much attention. But the increasing complexity of VLSI also creates lots of problems for the computer scientists to work on. If there is no other new way to help the designers, the whole design process will get more difficult to maintain. That's the need for an object-oriented (OO) design framework for CAD world. Not only to develop new methods is needed...

Introduction: Eolian dunes are a direct geomorphic expression of the dynamic interaction between the atmosphere and the lithosphere of planets. The timing, frequency and spatial extent of dune mobility reflect changing climatic conditions. However, one of the greatest challenges to deciphering the record of climate variability on Mars will be the need for absolute dating techniques, particularl...

Goda Buticha is a cave site near Dire Dawa in southeastern Ethiopia that contains an archaeological sequence sampling the late Pleistocene and Holocene of the region. The sedimentary sequence displays complex cultural, chronological and sedimentological histories that seem incongruent with one another. A first set of radiocarbon ages suggested a long sedimentological gap from the end of Marine ...

Abstract. Wave-transported boulders represent important records of storm and tsunami impact over geological timescales. Their use for hazard assessment requires chronological information on their displacement that in many cases cannot be achieved by established dating approaches. To fill this gap, study investigated, the first time, potential optically stimulated luminescence rock surface expos...

Monte Carlo modelling has been performed in support of efforts to establish emergency dosimetry services based on optically or thermally stimulated luminescence (OSL/TL) of the Al(2)O(3) substrate present on the resistors found in mobile phones, which can act as fortuitous retrospective dosemeters for photon exposures. Specifically, a range of exposure conditions has been modelled to assess the...