The energy response of agar‐alanine phantom dosimeter to gamma radiation

Ciesielski, B.; Wielopolski, L.; Reinstein, L. E.

doi:10.1118/1.596235

Cited by 13 publications

(4 citation statements)

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“…If an alanine crystal in the alanine/agarose gel is seen as a Burlin cavity of a representative size in a homogeneous mixture of the total gel, and if the photon energy spectrum is known, the calibration factor can be corrected for the energy dependence at low energies. This, and the influence of the crystal size, is discussed by Ciesielski et al (1988).…”

Section: Absorbed Dose In the Calibration Dosimetersmentioning

confidence: 99%

Radiation dose measurements with alanine/agarose gel and thin alanine films around a¹⁹²Ir brachytherapy source, using ESR spectroscopy

et al. 2002

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Alanine/agarose gel and alanine films in stacks have been used for measurements of absorbed dose around an HDR 192Ir source in a vaginal cylinder-applicator, with and without a 180 degrees tungsten shield. The gel and the films were analysed by means of ESR spectroscopy and calibrated against an ion chamber in a 4 MV photon beam to obtain absolute dose values. The gel serves as both dosimeter and phantom material, and the thin (130 microm) films are used to achieve an improved spatial resolution in the dose estimations. Experimental values were compared with Monte Carlo simulations using two different codes. Results from the measurements generally agree with the simulations to within 5%, for both the alanine/agarose gel and the alanine films.

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Section: Absorbed Dose In the Calibration Dosimetersmentioning

confidence: 99%

Radiation dose measurements with alanine/agarose gel and thin alanine films around a¹⁹²Ir brachytherapy source, using ESR spectroscopy

et al. 2002

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“…Although the first applications of alanine dosimetry for brachytherapy date back to the eighties of the last century (Ciesielski et al 1988), only a few centres have used the technique so far for quality assurance measurements in brachytherapy (Kuntz et al 1996, Schaeken and Scalliet 1996, De Angelis et al 1999, Olsson et al 2002, Calcina et al 2005, Schultka et al 2006, Anton et al 2009. However, the method has good potential, as do measurements using ESR imaging techniques (Kolbun et al 2010) or developments using other free radical dosimeter materials (Antonovic et al 2009, Adolfsson et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Response of the alanine/ESR dosimeter to radiation from an Ir-192 HDR brachytherapy source

Anton

Hackel

Zink³

et al. 2014

Phys. Med. Biol.

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The response of the alanine dosimeter to radiation from an Ir-192 source with respect to the absorbed dose to water, relative to Co-60 radiation, was determined experimentally as well as by Monte Carlo simulations. The experimental and Monte Carlo results for the response agree well within the limits of uncertainty. The relative response decreases with an increasing distance between the measurement volume and the source from approximately 98% at a 1 cm distance to 96% at 5 cm. The present data are more accurate, but agree well with data published by Schaeken et al (2011 Phys. Med. Biol. 56 6625-34). The decrease of the relative response with an increasing distance that had already been observed by these authors is confirmed. In the appendix, the properties of the alanine dosimeter with respect to volume and sensitivity corrections are investigated. The inhomogeneous distribution of the detection probability that was taken into account for the analysis was determined experimentally.

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“…The liquid ionization chamber described by Wickman (1974) and now further investigated by Mattsson et al (1990) and by Wickman (1991) is a very promising potentially perturbation-free dosimeter. The alanine-ESR dosimeter also falls into this category (Ciesielski et al 1988, Olsen et al 1990. Further development of these dosimeters would be extremely welcome.…”

Section: Non-gaseous Detectorsmentioning

confidence: 99%

Perturbation effects in dosimetry: Part I. Kilovoltage x-rays and electrons

Nahum¹

1996

Phys. Med. Biol.

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Perturbation effects are defined as departures from ideal large-detector or Bragg-Gray cavity behaviour. Such effects are central to the use of practical dosimeters for accurate dose determination, as is required in external-beam radiotherapy. A theoretical framework for treating perturbation effects is established. In this first part of the review, perturbation in kilovoltage x-ray and megavoltage electron beams are treated in detail, with the emphasis on ionization chambers. The displacement factor for ion chambers in kilovoltage x-ray beams is discussed, starting with the early, pioneering work of Lamerton and Lidén. The evidence for the large values of the perturbation factor in medium-energy x-ray beams (between 100 and 300 kV) recommended in the 1987 IAEA dosimetry code is critically examined and revised, smaller values are given. In electron beams the theoretical approaches to the correction for the in-scattering correction in gas-filled cavities is discussed in detail. The evidence for negligible perturbation in low-energy electron beams in plane-parallel chambers with adequate guardring widths is critically reviewed, including the suggested correction for perturbation due to backscattering differences between the chamber-wall material and the medium. The various models for the response of thermoluminescent dosimeters in electron beams are discussed. It is concluded that Monte Carlo simulation of dosimeter response is likely to play an even bigger role in the future.

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The energy response of agar‐alanine phantom dosimeter to gamma radiation

Cited by 13 publications

References 0 publications

Radiation dose measurements with alanine/agarose gel and thin alanine films around a¹⁹²Ir brachytherapy source, using ESR spectroscopy

Radiation dose measurements with alanine/agarose gel and thin alanine films around a¹⁹²Ir brachytherapy source, using ESR spectroscopy

Response of the alanine/ESR dosimeter to radiation from an Ir-192 HDR brachytherapy source

Perturbation effects in dosimetry: Part I. Kilovoltage x-rays and electrons

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The energy response of agar‐alanine phantom dosimeter to gamma radiation

Cited by 13 publications

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Radiation dose measurements with alanine/agarose gel and thin alanine films around a192Ir brachytherapy source, using ESR spectroscopy

Radiation dose measurements with alanine/agarose gel and thin alanine films around a192Ir brachytherapy source, using ESR spectroscopy

Response of the alanine/ESR dosimeter to radiation from an Ir-192 HDR brachytherapy source

Perturbation effects in dosimetry: Part I. Kilovoltage x-rays and electrons

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Radiation dose measurements with alanine/agarose gel and thin alanine films around a¹⁹²Ir brachytherapy source, using ESR spectroscopy

Radiation dose measurements with alanine/agarose gel and thin alanine films around a¹⁹²Ir brachytherapy source, using ESR spectroscopy