The response of LiF thermoluminescence dosemeters to photon beams in the energy range from 30 kV X rays to 60Co gamma rays

Davis, Stephen D.; Ross, C. K.; Mobit, Paul N; Zwan, L. van der; Chase, W.J.; Shortt, K R

doi:10.1093/oxfordjournals.rpd.a006332

Cited by 133 publications

(145 citation statements)

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“…Finally, LiF:Mg,Cu,P presented a fading of 7% between 3h and 48h and slow fading (8.8%) from 48h until 720h post irradiation. The CaSO 4 :Dy was the material with a higher fading in the period of one month at room temperature, which is in agreement with that reported in the literature [28], [29], in the case TLD-100 showed a high fading as reported by [30] and [31], while the LiF:Mg,Cu,P dosimeter was experienced slower fading due to loss of some of the initially trapped charges, between irradiation and reading the influence of heat (even at room temperature, thermal fading) or exposure to unwanted light (optical fading). It is further known that the response of LiF:Mg,Cu,P is more stable at ambient temperature than the TLD-100 [32], [33].…”

Section: Resultssupporting

confidence: 92%

Thermoluminescent characteristics of LiF:Mg, Cu, P and CaSO4:Dy for low dose measurement

Fernández

García-Salcedo

Mendoza

et al. 2016

Applied Radiation and Isotopes

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Thermoluminescence (TL) characteristics for LiF:Mg,Cu,P, and CaSO4:Dy under the homogeneous field of X-ray beams of diagnostic irradiation and its verification using thermoluminescence dosimetry is presented. The irradiation were performed utilizing a conventional X-ray equipment installed at the Hospital Juárez Norte of México. Different thermoluminescence characteristics of two material were studied, such as batch homogeneity, glow curve, linearity, detection threshold, reproducibility, relative sensitivity and fading. Materials were calibrated in terms of absorbed dose to the standard calibration distance and they were positioned in a generic phantom. The dose analysis, verification and comparison with the measurements obtained by the TLD-100 were performed. Results indicate that the dosimetric peak appears at 202 o C and 277.5 o C for LiF:Mg,Cu,P and CaSO4:Dy, respectively. TL response as a function of X-ray dose showed a linearity behavior in the very low dose range for all materials. However, the TLD-100 is not accurate for measurements below 4mGy. CaSO4:Dy is 80% more sensitive than TLD-100 and it show the lowest detection threshold, whereas LiF:Mg,Cu,P is 60% more sensitive than TLD-100. All material showed very good repeatability. Fading for a period of one month at room temperature showed low fading LiF:Mg,Cu,P, medium and high for TLD-100 and CaSO4:Dy. The results suggest that CaSO4:Dy and LiF:Mg,Cu,P are suitable for measurements at low doses used in radiodiagnostic.

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Section: Resultssupporting

confidence: 92%

Thermoluminescent characteristics of LiF:Mg, Cu, P and CaSO4:Dy for low dose measurement

Fernández

García-Salcedo

Mendoza

et al. 2016

Applied Radiation and Isotopes

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“…38 Since the publication of the 2004 TG-43U1 report 2 and its 2007 supplement, 4 a terminology has been introduced to rigorously describe dosimeter characteristics, 39,40 and important work has been reported on the complexity of using TLD dosimetry for low-energy sources. [41][42][43][44][45] In this terminology, 39,44 D med (Q) is the absorbed dose to the medium med at the point of measurement (normally the detector midpoint) in the absence of the detector for a given radiation quality Q. This is related to the detector measurement for the same radiation quality M(Q) and the absorbed dose calibration coefficient for the detector N D,med (Q) according to:…”

Section: D Tld Dosimetry Correctionsmentioning

confidence: 99%

Supplement 2 for the 2004 update of theAAPMTask Group No. 43 Report: Joint recommendations by theAAPMandGEC‐ESTRO

et al. 2017

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Cs (IsoRay Medical model CS-1 Rev2). Observations are included on the behavior of these dosimetry parameters as a function of radionuclide. Recommendations are presented on the selection of dosimetry parameters, such as from societal reports issuing consensus datasets (e.g., TG-43U1, AAPM Report #229), the joint AAPM/IROC Houston Registry, the GEC-ESTRO website, the Carleton University website, and those included in software releases from vendors of treatment planning systems. Aspects such as timeliness, maintenance, and rigor of these resources are discussed.Links to reference data are provided for radionuclides (radiation spectra and half-lives) and dose scoring materials (compositions and mass densities). The recent literature is examined on photon energy response corrections for thermoluminescent dosimetry of low-energy photon-emitting brachytherapy sources. Depending upon the dosimetry parameters currently used by individual physicists, use of these recommended consensus datasets may result in changes to patient dose calculations. These changes must be carefully evaluated and reviewed with the radiation oncologist prior to their implementation.

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“…The two TLD types show a different response with radiation energy compare to 60 Co 13. For the dose measurements, a TLD100H chip was put on top of a TLD100 chip.…”

Section: Methodsmentioning

confidence: 99%

Technical note: No increase in effective dose from half compared to full rotation pelvis cone beam CT

Hauri

Hälg

Schneider

2017

J Applied Clin Med Phys

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PurposeTo image the abdomen of a patient with a gantry mounted imaging system of a linear accelerator, different cone beam computed tomography (CBCT) protocols are available. The whole‐body dose of a full rotation abdomen CBCT and a half rotation CBCT was compared. In our clinic, both CBCT protocols are used in daily routine work.MethodsWith an adult anthropomorphic Alderson phantom, the whole‐body dose per CBCT scan was measured with thermoluminescence dosimeters. The half rotation CBCT was applied such that the gantry mounted X‐ray source rotated around the right side of the phantom. The 183 measurement locations covered all ICRP recommended critical organs (except the gonads). The effective dose was calculated with the mean organ dose and the corresponding tissue weighting factors. A point‐by‐point dose comparison of both protocols was conducted.ResultsThe effective dose was 5.4 mSv ±5% and 5.0 mSv ±5% (estimated type B 1σ) for the full and the half rotation CBCT respectively. There was no significant difference (α = 0.05) in the effective dose within the precision of the measurement (1σ = 5%). The half rotation CBCT displayed an inhomogeneous dose distribution in a transversal phantom slice in contrast with the full rotation CBCT. In the imaging region, the mean dose was (20.5 ± 3.4) mGy and (19.2 ± 7.4) mGy (measured type A 1σ) for the full and the half rotation CBCT respectively.ConclusionThe half compared to the full rotation CBCT displays a smaller field‐of‐view in a transversal slice and no significant difference in the effective dose. Hence, the full rotation CBCT is favorable compared to the half rotation CBCT. However, by using the half rotation protocol, critical volumes in the patient can be spared compared to the full rotation protocol.

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The response of LiF thermoluminescence dosemeters to photon beams in the energy range from 30 kV X rays to 60Co gamma rays

Cited by 133 publications

References 0 publications

Thermoluminescent characteristics of LiF:Mg, Cu, P and CaSO4:Dy for low dose measurement

Thermoluminescent characteristics of LiF:Mg, Cu, P and CaSO4:Dy for low dose measurement

Supplement 2 for the 2004 update of theAAPMTask Group No. 43 Report: Joint recommendations by theAAPMandGEC‐ESTRO

Technical note: No increase in effective dose from half compared to full rotation pelvis cone beam CT

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