Computerised Analysis of LiF GR-200 TL Signals: Application to Dose Measurements in the µGy Range

Delgado, Antonio; Ros, J M Gomez; Muñiz, J.L.

doi:10.1093/oxfordjournals.rpd.a082711

Cited by 13 publications

(6 citation statements)

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“…Lithium fluoride is the most commonly used TLD material in medicine and one of the most often quoted advantages of this low-Z TLD is its tissue equivalence (Horowitz 1984, Kron 1994). In the present study two types of this TLD material were investigated: lithium fluoride doped with magnesium and titanium (LiF:Mg, Ti) and a more recent development from the same family of materials, LiF:Mg, Cu, P (Wu et al 1984, Zha et al 1993, McKeever et al 1991, Horowitz 1993, Delgado et al 1995. The latter is approximately 30 to 50 times more sensitive than LiF:Mg, Ti and exhibits less supralinear behaviour.…”

Section: Thermoluminescence Dosimetersmentioning

confidence: 99%

Dose response of various radiation detectors to synchrotron radiation

et al. 1998

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Accurate dosimetry is particularly difficult for low- to medium-energy x-rays as various interaction processes with different dependences on material properties determine the dose distribution in tissue and radiation detectors. Monoenergetic x-rays from synchrotron radiation offer the unique opportunity to study the dose response variation with photon energy of radiation detectors without the compounding effect of the spectral distribution of x-rays from conventional sources. The variation of dose response with photon energies between 10 and 99.6 keV was studied for two TLD materials (LiF:Mg,Ti and LiF:Mg,Cu,P), MOSFET semiconductors, radiographic and radiochromic film. The dose response at synchrotron radiation energies was compared with the one for several superficial/orthovoltage radiation qualities (HVL 1.4 mm Al to 4 mm Cu) and megavoltage photons from a medical linear accelerator. A calibrated parallel plate ionization chamber was taken as the reference dosimeter. The variation of response with x-ray energy was modelled using a two-component model that allows determination of the energy for maximum response as well as its magnitude. MOSFET detectors and the radiographic film were found to overrespond to low-energy x-rays by up to a factor of 7 and 12 respectively, while the radiochromic film underestimated the dose by approximately a factor of 2 at 24 keV. The TLDs showed a slight overresponse with LiF:Mg, Cu, P demonstrating better tissue equivalence than LiF:Mg, Ti (maximum deviation from water less than 25%). The results of the present study demonstrate the usefulness of monoenergetic photons for the study of the energy response of radiation detectors. The variations in energy response observed for the MOSFET detectors and GAF chromic film emphasize the need for a correction for individual dosimeters if accurate dosimetry of low- to medium-energy x-rays is attempted.

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Section: Thermoluminescence Dosimetersmentioning

confidence: 99%

Dose response of various radiation detectors to synchrotron radiation

et al. 1998

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“…Third, the separation of the dosimetry signals from the residual signal by computerised analysis of glow curves. A 1-Gy test dose could be well and reproducibly measured at 200 Gy (Delgado et al, 1995) but it offered poor results after measurement at 500 Gy, after which the residual doses were so high that the program was unable to produce reliable results.…”

Section: Introductionmentioning

confidence: 99%

Study of a new Lif:Mg,Cu,P formulation with enhanced thermal stability and a lower residual TL signal

Tang¹,

Cui²,

Zhu³

et al. 2007

Radiation Measurements

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“…The same glow peak resolving analysis code employed in our previous work for TLD-100, using the first-order kinetics expression for single peaks, can also be applied to GR-200. A much simpler approach can be used for that analysis (Delgado et al 1995a), in which the individual peaks are not resolved. Instead of that, the global curve shape is inspected to detect the boundaries of the region in which peaks 3 and 4 appear, integrating the area within these boundaries, after subtracting spurious background signals and the contribution of the high-temperature distribution.…”

Section: Methodsmentioning

confidence: 99%

A study of LiF GR-200 for radiotherapy mailed dosimetry

Muñiz

Delgado²

1997

Phys. Med. Biol.

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A study of the measurement performance of LiF GR-200 for radiotherapy mailed dosimetry is presented. The study was carried out in the practical working conditions of a mailed system where a lengthy delay between dosimeter preparation and the final readout can occur. Prompt and delayed TL measurements were employed to determine, among other characteristics, the reusability and the stability during storage at room temperature. From the results obtained it can be concluded that GR-200, although producing dose results adequate for mailed dosimetry, does not improve the performance attainable with LiF TLD-100.

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Computerised Analysis of LiF GR-200 TL Signals: Application to Dose Measurements in the µGy Range

Cited by 13 publications

References 0 publications

Dose response of various radiation detectors to synchrotron radiation

Dose response of various radiation detectors to synchrotron radiation

Study of a new Lif:Mg,Cu,P formulation with enhanced thermal stability and a lower residual TL signal

A study of LiF GR-200 for radiotherapy mailed dosimetry

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