Variations in dose response with x-ray energy of LiF:Mg,Cu,P thermoluminescence dosimeters: implications for clinical dosimetry

In many medical procedures where accurate radiation dose measurements are needed, the variation of detector response with x-ray energy is of concern. The response of LiF:Mg,Cu,P TLDs to a range of x-ray energies was analysed in monoenergetic (synchrotron), diagnostic and therapy radiation beams with...

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Bibliographic Details
Published in:Physics in medicine & biology 2004-09, Vol.49 (17), p.3831-3845
Main Authors: Duggan, Lisa, Hood, Claire, Warren-Forward, Helen, Haque, Mamoon, Kron, Tomas
Format: Article
Language:English
Subjects:
Brachytherapy - methods
Copper - chemistry
Fluorides - chemistry
Humans
Iridium Radioisotopes - therapeutic use
Lithium Compounds - chemistry
Magnesium - chemistry
Mammography - methods
Models, Theoretical
Phantoms, Imaging
Phosphorus - chemistry
Radiation Dosage
Radiometry - instrumentation
Radiometry - methods
Radiotherapy - methods
Sensitivity and Specificity
Thermoluminescent Dosimetry - methods
X-Rays
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Summary:In many medical procedures where accurate radiation dose measurements are needed, the variation of detector response with x-ray energy is of concern. The response of LiF:Mg,Cu,P TLDs to a range of x-ray energies was analysed in monoenergetic (synchrotron), diagnostic and therapy radiation beams with the aim of implementing this dosimeter into clinical practice where existing dosimetry techniques are limited due to lack of sensitivity or tissue equivalence (e.g. neonatal radiography, mammography and brachytherapy). LiF:Mg,Cu,P TLDs in different forms from two manufacturers (MCP-N: TLD Poland, GR200: SDDML China) were irradiated using x-ray beams covering 10 keV to 18 MVp. Dose readings were compared with an ionization chamber. The effect of different TLD types and annealing cycles on clinical utility was investigated. The measured energy response of LiF:Mg,Cu,P TLDs was fit to a simple model devised by Kron et al (1998 Phys. Med. Biol. 43 3235-59) to describe the variation of TLD response with x-ray energy. If TLDs are handled as recommended in the present paper, the energy response of LiF:Mg,Cu,P deviates by a maximum of 15% from unity and agrees with the model to within 5% or experimental uncertainty between 15 keV and 10 MeV. LiF:Mg,Cu,P TLDs of all forms have consistent and superior energy response compared to the standard material LiF:Mg,Ti and are therefore suitable for a wide range of applications in diagnostic radiology and radiotherapy.
ISSN:0031-9155
1361-6560
DOI:10.1088/0031-9155/49/17/001