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SU‐E‐T‐172: Characterization of TLD‐100 (LiF:Mg,Ti) Microcube Energy Response in a Cylindrical Chamber Phantom
Author(s) -
Desai V,
Hammer C,
Kunugi K,
Culberson W,
DeWerd L
Publication year - 2015
Publication title -
medical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.473
H-Index - 180
eISSN - 2473-4209
pISSN - 0094-2405
DOI - 10.1118/1.4924534
Subject(s) - thermoluminescent dosimeter , imaging phantom , linear particle accelerator , materials science , irradiation , calibration , ionization chamber , dosimetry , nuclear medicine , optics , physics , nuclear physics , beam (structure) , medicine , dosimeter , ion , quantum mechanics , ionization
Purpose: To characterize the energy response of TLD‐100 microcubes inside a Virtual Water chamber phantom. Methods: Four TLD microcubes were placed inside a water‐proof Virtual Water (VW) chamber phantom and irradiated to a known dose on a Varian linac in a 1D water tank. These chamber phantoms were then replaced by TLD‐100 chips inside a separate VW paddle and irradiated to the same dose. Each energy response reading was calculated as light output per unit dose in nC/cGy and normalized to a calibration set irradiated to the same dose in 60Co. The differences in response between the TLD chips and microcubes were then analyzed. Results: Across all energies, the average microcube response was less sensitive to energy than the average chip response with both falling consistently within 2.8% of previously established values in the literature Conclusion: TLD microcubes showed a lower average sensitivity to energy than their TLD chip counterparts. The use of TLD‐100 microcubes inside the chamber phantom was validated against TLD‐100 chips inside of VW paddles.

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