Thermoluminescent characteristics of new pre-calibrated dosimeters (TLD) in commercially available readers for selected applications

Tawil, R.A.; Pontikos, P.; Szalanczy, A.; Velbeck, K.J.; Bruml, W.; Rotunda, J.E.

doi:10.1016/0168-9002(94)91687-x

Cited by 3 publications

(4 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In that work, the sensitivity increased by about 15% over a dose range from 0.5 to 6 Gy using an automatic Harshaw TL reader. A similar feature was also observed by Tawil et al (1994). As in the present work, these studies (Feist 1988, Tawil et al 1994 display a saturation of the The observed standard deviation in dosimeter reading for lithium formate dosimeters was rather high (3.0%).…”

Section: Generalsupporting

confidence: 89%

“…A similar feature was also observed by Tawil et al (1994). As in the present work, these studies (Feist 1988, Tawil et al 1994 display a saturation of the The observed standard deviation in dosimeter reading for lithium formate dosimeters was rather high (3.0%). However, if the observations outside the (1 ± 2σ ) limit were discarded from the investigations of variations in dosimeter reading (this may be a reasonable hypothesis for testing the lower limit of uncertainty), the standard deviation over the hence reduced sample space was 2.0%.…”

Section: Generalsupporting

confidence: 89%

See 1 more Smart Citation

Electron paramagnetic resonance (EPR) dosimetry using lithium formate in radiotherapy: comparison with thermoluminescence (TL) dosimetry using lithium fluoride rods

et al. 2004

View full text Add to dashboard Cite

Solid-state radiation dosimetry by electron paramagnetic resonance (EPR) spectroscopy and thermoluminescence (TL) was utilized for the determination of absorbed doses in the range of 0.5-2.5 Gy. The dosimeter materials used were lithium formate and lithium fluoride (TLD-100 rods) for EPR dosimetry and TL dosimetry, respectively. 60Co gamma-rays and 4, 6, 10 and 15 MV x-rays were employed. The main objectives were to compare the variation in dosimeter reading of the respective dosimetry systems and to determine the photon energy dependence of the two dosimeter materials. The EPR dosimeter sensitivity was constant over the dose range in question, while the TL sensitivity increased by more than 5% from 0.5 to 2.5 Gy, thus displaying a supralinear dose response. The average relative standard deviation in the dosimeter reading per dose was 3.0% and 1.2% for the EPR and TL procedures, respectively. For EPR dosimeters, the relative standard deviation declined significantly from 4.3% to 1.1% over the dose range in question. The dose-to-water energy response for the megavoltage x-ray beams relative to 60Co gamma-rays was in the range of 0.990-0.979 and 0.984-0.962 for lithium formate and lithium fluoride, respectively. The results show that EPR dosimetry with lithium formate provides dose estimates with a precision comparable to that of TL dosimetry (using lithium fluoride) for doses above 2 Gy, and that lithium formate is slightly less dependent on megavoltage photon beam energy than lithium fluoride.

show abstract

Section: Generalsupporting

confidence: 89%

Section: Generalsupporting

confidence: 89%

Electron paramagnetic resonance (EPR) dosimetry using lithium formate in radiotherapy: comparison with thermoluminescence (TL) dosimetry using lithium fluoride rods

et al. 2004

View full text Add to dashboard Cite

show abstract

“…The calibration process produced the element correction coefficient (ECC) value on each TLD chip that this ECC was a calibration factor that was compensated for the difference in the sensitivity of each TLD chip [ 14 - 17 ]. Further, ECC was used as a multiplier on the output dose reading so that the reading response of each TLD was proportional to the mean reading response of a group of TLDs or a dosimeter predefined as a recording dosimeter called the golden TLD [ 17 ].…”

Section: Methodsmentioning

confidence: 99%

“…Each TLD was calibrated before use, annihilated, heated to a temperature of 250 °C for 10 min with a heating rate of 10 °C/s in a nitrogen environment, and cooled at room temperature naturally to remove the remaining data on the TLD for minimizing reading errors. The calibration process produced the element correction coefficient (ECC) value on each TLD chip that this ECC was a calibration factor that was compensated for the difference in the sensitivity of each TLD chip [14][15][16][17]. Further, ECC was used as a multiplier on the output dose reading so that the reading response of each TLD was proportional to the mean reading response of a group of TLDs or a dosimeter predefined as a recording dosimeter called the golden TLD [17].…”

Section: Dosemetermentioning

confidence: 99%

Evaluation of 3D Printed Anthropomorphic Head Phantom for Calibration of TLD in Eye Lens Dosimeter

2023

J Biomed Phys Eng

View full text Add to dashboard Cite

Background: Calibration of Thermo Luminescent Dosimetry (TLD) in eye lens dosimeter requires a standard phantom. The use of anthropomorphic phantoms in calibration needs evaluation.Objective: This study aimed to analyze the angular response of the TLD on the fabricated 3D anthropomorphic head phantom and Computerized Imaging Reference Systems (CIRS)-Computed Tomography (CT) dose phantom as a standard phantom irradiated with Cs-137 and to compare the absorbed dose and linear attenuation for both phantoms. H p (3) analysis, conversion coefficient (h pK (3)), and calibration factor (CF) are also investigated. Material and Methods:In this experimental study, the fabricated 3D printed anthropomorphic head phantom was analyzed using polylactic acid (PLA) with the skull and then filled with the artificial brain and cerebrospinal fluid (CSF) as a test phantom. TLD-700H and TLD Reader Harshaw 6600 plus were used to analyze the angular response of Cs-137 radiation and to determine the absorbed dose and linear attenuation coefficient of test and standard phantoms. Results:The effect of the angle of radiation source towards TLD reading at the anthropomorphic head phantom has a similar value to the standard phantom with a calibration factor ranging from 0.82 to 1. The absorbed dose measurement and the linear attenuation coefficient of the anthropomorphic head phantom with the standard phantom have different values of 2.52 and 3.78%, respectively. Conclusion:The fabricated 3D printed anthropomorphic head phantom has good potential as an alternative to standard phantoms for TLD calibration in eye lens dosimeter.

show abstract

Experimental verification of consistency of micro-silica glass bead thermoluminescent detectors for mixed gamma/neutron irradiation

Bindu

Termsuk

Hubbard

et al. 2021

Radiation Physics and Chemistry

View full text Add to dashboard Cite

Thermoluminescent characteristics of new pre-calibrated dosimeters (TLD) in commercially available readers for selected applications

Cited by 3 publications

References 0 publications

Electron paramagnetic resonance (EPR) dosimetry using lithium formate in radiotherapy: comparison with thermoluminescence (TL) dosimetry using lithium fluoride rods

Electron paramagnetic resonance (EPR) dosimetry using lithium formate in radiotherapy: comparison with thermoluminescence (TL) dosimetry using lithium fluoride rods

Evaluation of 3D Printed Anthropomorphic Head Phantom for Calibration of TLD in Eye Lens Dosimeter

Experimental verification of consistency of micro-silica glass bead thermoluminescent detectors for mixed gamma/neutron irradiation

Contact Info

Product

Resources

About