Spatial distribution readout system of thermoluminescence sheets

Imaeda, K.; Kitajima, T.; Kuga, K.; Miono, S.; Misaki, A.; Nakamura, Masaki; Ninagawa, K.; Okamoto, Y.; Saavedra, O.; Saito, Takeshi; Takahashi, N.; Takano, Yasumasa; Tomiyama, T.; Wada, T.; Yamamoto, Isao; Yamashita, Y

doi:10.1016/0168-9002(85)90612-6

Cited by 21 publications

(4 citation statements)

References 3 publications

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“…The highest spatial resolution of the TL sheet was 62 µm corresponding to 8.1 linepair mm −1 (Iwata et al 1995). The TL sheet readout system comprises a controlled panel heater, a band-pass filter, a CCD camera which was cooled when being used to decrease the noise caused by dark current, an A/D converter and an online host computer (Imaeda et al 1985, Yamamoto et al 1987. After the thermally stimulated luminescence from the irradiated TL sheet passes through the band-pass filter, the light is focused onto the front window of a CCD camera by an objective lens.…”

Section: Tl Sheet and Its Readout Systemmentioning

confidence: 99%

“…Since the strength of interstitial brachytherapy sources is relatively low, dosimetry measurements with radiochromic film require long exposure times which can introduce problems with the interpretation of the response of radiochromic film (Niroomand-Rad et al 1998). To overcome these difficulties, a thermoluminescent sheet (TL sheet) made of Teflon homogeneously mixed with small particles of thermoluminescence material (BaSO 4 :Eu doped) and its corresponding readout system was introduced by Imaeda et al (1985) and further developed by Okamoto et al (1986) and Yamamoto et al (1987). This system was first applied in clinical dosimetry for an intracavitary brachytherapy source by Iwata et al (1992) and for external beam dosimetry by Iwata et al (1995).…”

Section: Introductionmentioning

confidence: 99%

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Two-dimensional dosimetry in the near field of the model 200¹⁰³Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

2004

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A large area and highly sensitive thermoluminescent (TL) sheet film was used for two-dimensional dose distribution measurements at millimetre distances from a 103Pd interstitial brachytherapy source. The TL film is made of Teflon homogeneously mixed with small particles of thermoluminescent material (BaSO4: Eu doped). This TL sheet (5 cm x 5 cm) was used to determine the relative dosimetric characteristics (i.e., radial dose function, 2D and 1D anisotropy functions, as defined by the updated AAPM Task Group No 43 report) of the model 200 103Pd source that emits low energy photons (21 keV). The two-dimensional dosimetry data were obtained for distances from the source surface to 15 mm. The radial dose function measured with the TL sheet is in reasonable agreement within 11% with the values recommended in the updated AAPM TG-43 report. All the measured 2D dose distributions showed limited symmetry about the source axes. The differences between the 1D anisotropy function values measured with the TL sheet and the data recommended in the updated AAPM TG-43 report were 10% at 5 mm and 7.5% at 10 mm, respectively, for the model 200 103Pd seed. Our experiments have demonstrated that it is feasible to use the TL sheet as a dosimeter in the determination of the dosimetric characteristics in the immediate vicinity of interstitial brachytherapy sources emitting low energy photons.

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Section: Tl Sheet and Its Readout Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Two-dimensional dosimetry in the near field of the model 200¹⁰³Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

2004

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“…A TL sheet and its read-out system have been developed for studying hadronic and electromagnetic cascade showers [8][9][10][11]. The TL sheet is a mixture of BaSO 4 :Eu doped and Teflon.…”

Section: Tl Sheet Sensitivity To Slow Ionsmentioning

confidence: 99%

Search for nuclearites using the TL stack detector

Okei¹,

Wada²,

Yamashita³

et al. 2001

J. Phys. G: Nucl. Part. Phys.

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It is shown that a thermoluminescent (TL) sheet stack detector, consisting of TL sheets and medical x-ray films, is an effective nuclearite detector. Nuclearite energy loss is not explicitly used for the estimation of the TL stack sensitivity to nuclearites, but implicitly by considering ways of energy deposition. The 90% confidence level flux limit obtained with the TL stack detector is given for a certain β-M range of nuclearites. For nuclearites of β = 10 −3 at sea level and M 2 × 10 15 GeV c −2 , the limit is 1.3 × 10 −13 s −1 cm −2 sr −1 .

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“…An alternative is a thermoluminescent sheet (TL sheet) made of Teflon homogeneously mixed with thermoluminescence powders (BaSO 4 : Eu doped). [7][8][9][10] This TL sheet has advantages of high sensitivity, high spatial resolution, and linear response over a very wide range (approximately 0.002 to 5000 cGy) of absorbed dose. 10 In this work, we present the first application of TL sheet for relative dose measurements in the near fields of 125 I sources.…”

Section: Introductionmentioning

confidence: 99%

Near‐field dosimetry of sources for interstitial brachytherapy implants measured using thermoluminescent sheets

2004

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The dosimetric characteristics were measured for two types of 125I low-energy photon-emitting sources by using a wide and highly sensitive thermoluminescent (TL) sheet film, which was developed for two-dimensional dose distribution measurements. The TL film is made of Teflon homogeneously mixed with small powders of thermoluminescence (BaSO4:Eu doped). Various dosimetric parameters (i.e., radial dose function, 2D and 1D anisotropy functions) of model 6711 and 6702 125I sources were obtained at various distances from the source surfaces to 15 mm. These parameters obtained with TL sheet were compared with the data recommended in the updated AAPM TG-43 report. The radial dose functions measured with TL sheet are in agreement with those established data of model 6711 125I seed and model 6702 125I seed at most of the distances within 5% and 7%, respectively. All the measured anisotropy functions showed symmetry about the longitudinal source axis. The anisotropy of dose distributions was clearly present in the immediate vicinity of the source edges. The measured 2D anisotropy function values at 1 cm are in reasonably good agreement with the recommended values. The differences at two points in the 1D anisotropy functions measured with TL sheet and the established data at 1 cm from source center were 0.7% and 1.9% for model 6711 and 6702 125I sources, respectively; the differences at 0.5 cm were 1.5% and 1.7% for model 6711 and 6702 125I sources, respectively. The relative dosimetric characteristics in the vicinity of actual interstitial brachytherapy sources containing 125I have been experimentally determined by using the TL sheet as a 2D dosimeter.

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Spatial distribution readout system of thermoluminescence sheets

Cited by 21 publications

References 3 publications

Two-dimensional dosimetry in the near field of the model 200¹⁰³Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

Two-dimensional dosimetry in the near field of the model 200¹⁰³Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

Search for nuclearites using the TL stack detector

Near‐field dosimetry of sources for interstitial brachytherapy implants measured using thermoluminescent sheets

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Spatial distribution readout system of thermoluminescence sheets

Cited by 21 publications

References 3 publications

Two-dimensional dosimetry in the near field of the model 200103Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

Two-dimensional dosimetry in the near field of the model 200103Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

Search for nuclearites using the TL stack detector

Near‐field dosimetry of sources for interstitial brachytherapy implants measured using thermoluminescent sheets

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Product

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Two-dimensional dosimetry in the near field of the model 200¹⁰³Pd source for interstitial brachytherapy implants using a thermoluminescent sheet

Two-dimensional dosimetry in the near field of the model 200¹⁰³Pd source for interstitial brachytherapy implants using a thermoluminescent sheet