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Radiation Protection Dosimetry Advance Access originally published online on July 12, 2007
Radiation Protection Dosimetry 2008 128(3):261-265; doi:10.1093/rpd/ncm368
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© The Author 2007. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

OSL and TL in LiF:Mg,Ti following alpha particle and beta ray irradiation: application to mixed-field radiation dosimetry

L. Oster1,*, Y. S. Horowitz2 and L. Podpalov1

1 Physics Unit, Sami Shamoon College of Engineering, Bialik/Basel Sts., Beer-Sheva 84100, Israel
2 Physics Department, Ben Gurion University of the Negev, Beer-Sheva 84105, Israel

* Corresponding author: leonido{at}sce.ac.il

Received March 20, 2007, amended May 31, 2007, accepted June 14, 2007

The optically stimulated luminescence (OSL) of LiF:Mg,Ti (TLD-100) following irradiation by beta and alpha particles was investigated by the measurement of the excitation and emission spectra of OSL and comparison with thermoluminescence (TL) characteristics. Measurements were also carried out on nominally pure LiF monocrystals. The preferential excitation of OSL compared to TL following high-ionisation density (HID) alpha irradiation is naturally explained via the identification of OSL with the ‘two-hit’ F2 or F3+ centre, whereas the major component of composite TL glow peak 5 is believed to arise from a ‘one-hit’ complex defect. This discovery allows near-total discrimination between HID radiation and low-ionisation density radiation and may have significant potential in mixed-field radiation dosimetry.


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