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

Duggan, Lisa; Hood, Claire; Warren‐Forward, Helen; Haque, Md. Mahmudul; Kron, Tomas

doi:10.1088/0031-9155/49/17/001

Cited by 93 publications

(62 citation statements)

References 37 publications

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“…Nevertheless, both of the related values of dosimeters are placed inside of the trumpet curves. The results are compatible with the energy response of bare dosimeters which have been already reported by other investigators (8,9) .…”

Section: Resultssupporting

confidence: 93%

Response of TLD and RPL personal dosimeters in a national inter-comparison test program

Moghadam

Pooya

Afarideh

et al. 2016

IJRR

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Background: Different kinds and models of personal dosimeters are used in individual monitoring by workers. Performance tes ng as part of approval procedures is carried out to demonstrate that the essen al performance specifica ons are rou nely maintained. There are four service providers in Iran which use different luminescence techniques (i. e. TLD and RPL) with various kinds of dosimeter materials/reader instruments in personal dosimetry services. Materials and Methods: A na onal performance approval tests program was performed for the dosimeters of the service providers in energy range of so', 660 keV and 1.25 MeV, at the doses values around the recoding, inves ga on and annual dose limits, and different angle of incidents (e. g. 0, 20, 40 and 60 degree). Results: The results of this tes ng sa sfies the overall accuracy criteria with 95% confidence levels specified by the ICRP, except that of RPL technique in low energy which overes mates the dose out of the acceptable accuracy band defined as the ICRP trumpet curves. Conclusion: The inter-comparison has proved that the personal dose equivalent quan ty, H p (10), defined by the ICRU and recommended by the IAEA are becoming widely accepted and implemented in most par cipated laboratories.

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Section: Resultssupporting

confidence: 93%

Response of TLD and RPL personal dosimeters in a national inter-comparison test program

Moghadam

Pooya

Afarideh

et al. 2016

IJRR

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“…Furthermore, while conventional MTS‐N TLDs exhibit an energy response limiting their use in kV dosimetry applications, Duggan et al (18) showed that MCP‐N TLDs are not significantly energy‐dependent at low energies.…”

Section: Methodsmentioning

confidence: 99%

Experimental validation of a kV source model and dose computation method for CBCT imaging in an anthropomorphic phantom

Poirier¹,

Tambasco

2016

J Applied Clin Med Phys

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We present an experimental validation of a kilovoltage (kV) X‐ray source characterization model in an anthropomorphic phantom to estimate patient‐specific absorbed dose from kV cone‐beam computed tomography (CBCT) imaging procedures and compare these doses to nominal weighted CT‐dose index (CTDIw) dose estimates. We simulated the default Varian on‐board imager 1.4 (OBI) default CBCT imaging protocols (i.e., standard‐dose head, low‐dose thorax, pelvis, and pelvis spotlight) using our previously developed and easy to implement X‐ray point‐source model and source characterization approach. We used this characterized source model to compute absorbed dose in homogeneous and anthropomorphic phantoms using our previously validated in‐house kV dose computation software (kVDoseCalc). We compared these computed absorbed doses to doses derived from ionization chamber measurements acquired at several points in a homogeneous cylindrical phantom and from thermoluminescent detectors (TLDs) placed in the anthropomorphic phantom. In the homogeneous cylindrical phantom, computed values of absorbed dose relative to the center of the phantom agreed with measured values within ≤2% of local dose, except in regions of high‐dose gradient where the distance to agreement (DTA) was 2 mm. The computed absorbed dose in the anthropomorphic phantom generally agreed with TLD measurements, with an average percent dose difference ranging from 2.4%±6.0% to 5.7%±10.3%, depending on the characterized CBCT imaging protocol. The low‐dose thorax and the standard dose scans showed the best and worst agreement, respectively. Our results also broadly agree with published values, which are approximately twice as high as the nominal CTDIw would suggest. The results demonstrate that our previously developed method for modeling and characterizing a kV X‐ray source could be used to accurately assess patient‐specific absorbed dose from kV CBCT procedures within reasonable accuracy, and serve as further evidence that existing CTDIw assessments underestimate absorbed dose delivered to patients.PACS number(s): 87.57.Q‐, 87.57.uq, 87.10.Rt

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“…TLD‐GR200A (LiF: Mg, Cu, P) (PTW, Freiburg, Germany) circular chips ( 6 ) of dimension 0.8 mm thickness by 4.5 mm diameter were used in this study. The irradiated TLDs were read using a KFKI RMKI TLD reader (KFKI Research Institute of the Hungarian Academy of Sciences, Budapest, Hungary) and were annealed by heating at 240°C for 10 min followed by fast cooling.…”

Section: Methodsmentioning

confidence: 99%

Thermoluminescent and Monte Carlo dosimetry of IR06‐ brachytherapy source

Saidi

Sadeghi

Hosseini

et al. 2011

J Applied Clin Med Phys

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This work presents experimental dosimetry results for a new normalP103d brachytherapy seed, in accordance with the AAPM TG‐43U1 recommendation that all new low‐energy interstitial brachytherapy seeds should undergo one Monte Carlo (MC) and at least one experimental dosimetry characterization. Measurements were performed using TLD‐GR200A circular chip dosimeters using standard methods employing thermoluminescent dosimeters in a Perspex phantom. The Monte Carlo N‐particle (MCNP) code, version 5 was used to evaluate the dose‐rate distributions around this model normalP103d source in water and Perspex phantoms. The consensus value for dose‐rate constant of the IR06‐normalP103d source was found equal to 0.690 cG⋅normalh−1⋅normalU−1. The anisotropy function, F(r, θ), and the radial dose function, normalgnormalL(r), of the seed were measured in Perspex phantom and calculated in both Perspex and liquid water phantom. The measured values were also found in good agreement with corresponding MC calculations.PACS number: 87.53.Jw

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

Cited by 93 publications

References 37 publications

Response of TLD and RPL personal dosimeters in a national inter-comparison test program

Response of TLD and RPL personal dosimeters in a national inter-comparison test program

Experimental validation of a kV source model and dose computation method for CBCT imaging in an anthropomorphic phantom

Thermoluminescent and Monte Carlo dosimetry of IR06‐ brachytherapy source

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