4/3/2023 0 Comments Odyssey salty cracker![]() ![]() These PSL systems allow to perform measurements directly on the materials without any pre-treatment, thus making the analyses extremely rapid. New models are also available, additionally offering double stimulation by infrared and visible radiation which makes them more suitable for the application in retrospective dosimetry. Different models/brands are available around the world and used mainly for food control their characteristics are small size and weight which make them portable, low cost and simple for application on the scene of the accident. This type of PSL reader was primarily designed to identify irradiated food by detecting the luminescence emitted, after infrared stimulation, by the silicates contaminating the foodstuffs but, in principle, it could be applied for different purposes on other materials with luminescence properties. ![]() Starting from these findings, a novel method, based on the use of a low-cost portable instrument for Photo-Stimulated Luminescence (PSL) have been tested on above mentioned inexpensive matrices. Of particular interest are the results obtained with objects of no considerable value which people would easily donate in an emergency situation. The stimulated luminescence techniques, in particular, have been successfully applied to various materials taken from personal objects like watches, electronic devices, ID cards, cigarettes, banknotes, paper tissues, mobile phone parts, salty snacks, etc. Those are analyzed by different physical techniques. In the absence of a professional dosimeter, some common objects belonging to the individuals involved in the accident could serve as fortuitous dosimeters. Retrospective dosimetry plays a key role in the determination of the absorbed dose due to an accident in a nuclear reactor, a terrorist attack, a nuclear weapon explosion or a small-scale accident that could occur in medicine or industry ( 1– 3). G5684) supported by NATO Science for Peace and Security Programme. The study was simultaneously conducted by two laboratories (Ruder Bošković Institute, RBI, Croatia and Istituto Superiore di Sanità, ISS, Italy) involved in the BioPhyMeTRE project (grant No. Moreover, strong correlation of the measurements performed in the two different instruments, as well as the rapidity of the analysis and the simplicity of the operations, suggest that this method can be suitable for a rapid radiation triage of a large number of civilians in a mass casualty event. ![]() The results indicated that the limit of detection can be improved by applying blue light stimulation. The main dosimetric characteristics were investigated by using two different models of PSL readers equipped with single (infrared) or double (infrared, blue light) stimulation. The observed decrease of the signal does not prevent the detection in the dose range typical for R/N emergency. Additionally, the signal stability was investigated for samples irradiated with 0.3 and 3 Gy. The dose response was determined for doses up to 5 Gy, which allowed the calculation of the limit of detection. This paper focused on the Photo-Stimulated Luminescence (PSL) response of salty crackers confronts the problem of sample preparation (mass, grain size), dose response and signal stability. The preparation of these objects for the measurement should be such as to give the most accurate and precise results. At times, a professional dosimeter is not available and therefore some common belongings may be used as fortuitous dosimeters. When a radiological and nuclear (R/N) emergency occurs, the categorization of individuals into those who are unaffected and those requiring medical intervention is a high priority.
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