title: Luminescence-based retrospective dosimetry using Al2O3 from mobile phones: a simulation approach to determine the effects of position.
abstract: 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 dependence of the dosimetry on factors such as the position of resistors within a phone, the orientation of the phone relative to the source, and the location of the phone relative to its owner. Variations due to the resistors' positions and the phone's orientation were generally found to contribute just a few percent to the uncertainty on the dose assessments, though the electrical contacts surrounding the resistors could potentially enhance these by several 10s of percent. But, the location of the phone was found to impact dosimetry greatly. The largest discrepancies in the results were found for low-energy exposures: for (192)Ir, differences of up to an order-of-magnitude were found between resistor and whole body doses. The outcome of the work was to derive correction / calibration factors that can be applied to estimate whole body doses from OSL/TL readings, the accurate application of which would depend on the knowledge of the exposure geometry and the degree of conservatism acceptable for the dose assessment.
authors.affiliation: Public Health England CRCE, Chilton, Didcot, OXON, UK.
authors.forename: J S
authors.initials: JS
authors.lastname: Eakins
authors.forename: E
authors.initials: E
authors.lastname: Kouroukla
mesh_terms: D000537:Aluminum Oxide / Q000528:radiation effects*; D016477:Artifacts; D040421:Cell Phone; D003198:Computer Simulation; D017076:Computer-Aided Design; D004307:Dose-Response Relationship, Radiation; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006801:Humans; D007495:Iridium / Q000032:analysis*; D007554:Isotopes / Q000032:analysis; D008163:Luminescent Measurements / Q000295:instrumentation; D015233:Models, Statistical; D009010:Monte Carlo Method; D011829:Radiation Dosage; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D013819:Thermoluminescent Dosimetry / Q000295:instrumentation*; D014915:Whole-Body Counting / Q000295:instrumentation*
chemical_list: D007554:Isotopes; D007495:Iridium; D000537:Aluminum Oxide