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Mafodda, A. ; Woda, C.

Retrospective dosimetry based on red Thermoluminescence (RTL) of a single resistor from mobile phones.

Radiat. Meas. 196:107717 (2026)
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Open Access Hybrid
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In the framework of the European Project CONFIDENCE („COping with uNcertainties For Improved modelling and DEcision making in Nuclear emergenCiEs”), the dosimetric properties of alumina (Al2O3) substrates of surface-mount resistors placed on mobile phone circuit boards were used to further develop a new retrospective dosimetry method. Resistors showed a strong emission due to the Cr3+ emission at a wavelength of 695 nm, thus enabling Thermoluminescence (TL) measurements in the red detection window (RTL). The resulting strong increase in sensitivity, as compared to the earlier protocols in TL and OSL with either blue or UV light detection, allowed to establish a new protocol which is optimized for the low-dose region (10-100 mGy) and is based only on a single resistor. The single resistor can be potentially replaced, leaving the phone intact. Possible parameters affecting the precision of the method such as confounding signals intrinsic to the material (zero-dose), signal loss with time (anomalous fading), and uncertainty related to the instrumentation were explored. Irradiation trials on intact smartphones demonstrated that dose assessment down to 20 mGy and 40 mGy is possible at the single resistor level, for measurements up to several days and 30 days after exposure, respectively.
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Publication type Article: Journal article
Document type Scientific Article
Keywords Red Thermoluminescence ; Resistors From Mobile Phones ; Retrospective Dosimetry; Optically Stimulated Luminescence; Electronic Components; Osl Dosimetry
ISSN (print) / ISBN 1350-4487
e-ISSN 1879-0925
Journal Radiation Measurements
Quellenangaben Volume: 196, Issue: , Pages: , Article Number: 107717 Supplement: ,
Publisher Elsevier
Publishing Place The Boulevard, Langford Lane, Kidlington, Oxford Ox5 1gb, England
Reviewing status Peer reviewed
Institute(s) Institute of Radiation Medicine (IRM)
Grants Horizon 2020-EURATOM Programme for Research and Innovation