TLD linearity vs. beam energy and modality |
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Authors: | Andrew J. Troncalli A.S. R.T.T. Jane Chapman C.M.D. M.Ed. |
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Affiliation: | a School of Health Sciences, The University of Texas M. D. Anderson Cancer Center, Houston, TX, USA |
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Abstract: | Thermoluminescent dosimetry (TLD) is considered to be a valuable dosimetric tool in determining patient dose. Lithium fluoride doped with magnesium and titanium (TLD-100) is widely used, as it does not display widely divergent energy dependence. For many years, we have known that TLD-100 shows supralinearity to dose. In a radiotherapy clinic, there are multiple energies and modality beams. This work investigates whether individual linearity corrections must be used for each beam or whether a single correction can be applied to all beams. The response of TLD as a function of dose was measured from 25 cGy to 1000 cGy on both electrons and photons from 6 to 18 MeV. This work shows that, within our measurement uncertainty, TLD-100 exhibits supralinearity at all megavoltage energies and modalities. |
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Keywords: | Thermoluminescent dosimetry Supralinearity Lithium fluoride Linearity correction |
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