Solid State Phenomena Vol. 238

Abstract: A subset of solid state materials have long been used as integrating dosimeters because they store energy deposited as a result of their interactions with ionizing radiation and then, when stimulated appropriately, release a proportionate amount of visible or near-visible light. During the 1960s, thermoluminescent dosimeters (TLDs), for which heat is used to extract the stored dosimetric signal, began to replace the photographic film as occupational dosimeters of record and for medical dosimetry. At the end of the twentieth century, a viable optically stimulated luminescent (OSL) material was developed which is now gaining in popularity as both an occupational and medical dosimeter. This paper reviews the related stored luminescence processes, presenting a simple conceptual model for optical absorption transitions in OSL materials along with a basic mathematical model for delayed luminescence. The approaches for extracting signal from the OSLs are enumerated.

Abstract: Range of heavy ion is one of the important parameters and understanding of this parameter is highly essential in almost all those experiments where heavy ions are used. The present review deals with the range measurements of different heavy ions through solid state nuclear track detectors (SSNTDs) technique. The importance of SSNTD technique as compared to other techniques is highlighted and different methods/models proposed for range measurements are described. An attempt has been made to compile the measured range values for heavy ions from H⁴ to U²³⁸ in different classes of SSNTD materials viz. polymers, glasses and minerals, from the available literature. An inter-comparison between the measured range values of different laboratories and through different range measurement methods has been made. Further, the reliability and validity of most commonly used theoretical and semi-empirical/empirical range formulations, through comparison with the measured range, are highlighted. Furthermore, the isotropic and anisotropic behaviour in polymers and minerals through range measurements has been described.Contents of Paper

Abstract: The energy loss for swift heavy ions, covering Z=3-29(~0.2 - 5.0MeV/n), has been calculated in the elemental absorbers like C, Al and Ti. The present calculations are based on Bohr’s approach applicable in both classical and quantum mechanical regimes. The major input parameter, the effective charge, has been calculated in a different way without any empirical/semi-empirical parameterization. The calculated energy loss values have been compared with the available experimental data which results in a close agreement.