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Optically stimulated luminescence (OSL) dosimetry in irradiated alumina substrates from mobile phone resistors

Geber-Bergstrand, Therése LU ; Bernhardsson, Christian LU ; Christiansson, Maria LU ; Mattsson, Sören LU and Rääf, Christopher L. LU (2017) In Radiation and Environmental Biophysics
Abstract

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 regenerative dose (calibration dose; Di) had no impact on the accuracy of dose estimates. Therefore, it is recommended that the Di be set as low as is practicable, so as to accelerate data retrieval. The critical dose, DCL, and dose limit of detection, DDL, taking into account the... (More)

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 regenerative dose (calibration dose; Di) had no impact on the accuracy of dose estimates. Therefore, it is recommended that the Di be set as low as is practicable, so as to accelerate data retrieval. The critical dose, DCL, and dose limit of detection, DDL, taking into account the uncertainty in the dose–response relation as well as the uncertainty in the background signal, was estimated to be 7 and 13 mGy, respectively, 1 h after exposure. It is concluded that given the significant long-term component of fading, an absorbed dose of 0.5 Gy might still be detectable up to 6 years after the exposure. Thus, OSL from alumina substrates can be used for dosimetry for time periods far in excess of those previously thought.

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author
organization
publishing date
type
Contribution to journal
publication status
epub
subject
keywords
Alumina substrates, Emergency dosimetry, Fading, OSL, Resistors, Retrospective dosimetry
in
Radiation and Environmental Biophysics
pages
7 pages
publisher
Springer
external identifiers
  • scopus:85038352232
ISSN
0301-634X
DOI
10.1007/s00411-017-0725-2
language
English
LU publication?
yes
id
66c3c06c-2403-42fc-899a-d9e907e0557d
date added to LUP
2018-01-03 10:34:01
date last changed
2018-01-04 03:00:08
@article{66c3c06c-2403-42fc-899a-d9e907e0557d,
  abstract     = {<p>In this study the dosimetric properties of alumina (Al<sub>2</sub>O<sub>3</sub>) 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 regenerative dose (calibration dose; D<sub>i</sub>) had no impact on the accuracy of dose estimates. Therefore, it is recommended that the D<sub>i</sub> be set as low as is practicable, so as to accelerate data retrieval. The critical dose, D<sub>CL</sub>, and dose limit of detection, D<sub>DL</sub>, taking into account the uncertainty in the dose–response relation as well as the uncertainty in the background signal, was estimated to be 7 and 13 mGy, respectively, 1 h after exposure. It is concluded that given the significant long-term component of fading, an absorbed dose of 0.5 Gy might still be detectable up to 6 years after the exposure. Thus, OSL from alumina substrates can be used for dosimetry for time periods far in excess of those previously thought.</p>},
  author       = {Geber-Bergstrand, Therése and Bernhardsson, Christian and Christiansson, Maria and Mattsson, Sören and Rääf, Christopher L.},
  issn         = {0301-634X},
  keyword      = {Alumina substrates,Emergency dosimetry,Fading,OSL,Resistors,Retrospective dosimetry},
  language     = {eng},
  month        = {12},
  pages        = {7},
  publisher    = {Springer},
  series       = {Radiation and Environmental Biophysics},
  title        = {Optically stimulated luminescence (OSL) dosimetry in irradiated alumina substrates from mobile phone resistors},
  url          = {http://dx.doi.org/10.1007/s00411-017-0725-2},
  year         = {2017},
}