2012
DOI: 10.1088/0026-1394/49/5/s189
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LNE–LNHB air-kerma and absorbed dose to water primary standards for low dose-rate125I brachytherapy sources

Abstract: The devices and methods applied for the LNE–LNHB primary standards in terms of reference air-kerma and absorbed dose to water for low dose-rate brachytherapy sources are described. Both standards are based on ionometric measurements, using a circular-shaped free-in-air ionization chamber, and Monte Carlo calculated conversion factors. Results for an IBt Bebig 125I source are presented and used here to assess the dose-rate constant. Uncertainties of 1.5% and 1.6% (with k = 1) were found for the air-kerma rate a… Show more

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Cited by 6 publications
(6 citation statements)
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“…The Laboratoire National Henri Becquerel (LNHB; Gif-sur-Yvette, France) has built a novel, circular free air chamber 24 for the realization of the RAKR for LDR 103 Pd and 125 I photon sources. The chamber is in the shape of a torus with an outer diameter of about 1 m and a rectangular cross-section, which looks similar to a conventional free air chamber.…”
Section: Air Kerma Rate Primary Standardsmentioning
confidence: 99%
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“…The Laboratoire National Henri Becquerel (LNHB; Gif-sur-Yvette, France) has built a novel, circular free air chamber 24 for the realization of the RAKR for LDR 103 Pd and 125 I photon sources. The chamber is in the shape of a torus with an outer diameter of about 1 m and a rectangular cross-section, which looks similar to a conventional free air chamber.…”
Section: Air Kerma Rate Primary Standardsmentioning
confidence: 99%
“…At LNHB, the circular free air chamber, which was originally designed for RAKR measurements of LDR brachytherapy sources, has been modified slightly to enable absorbed dose rate measurements of LDR 125 I sources. 24 Instead of holding the iodine seed in a low-attenuating Kapton holder, for the absorbed dose measurement, the source is placed inside a spherical water-equivalent phantom with 1-cm radius made of PMMA. The source and phantom assembly is positioned at the centre of the ring-shaped chamber, and the water kerma rate at the surface of the PMMA sphere is measured.…”
Section: Absorbed Dose Rate To Water Primary Standardsmentioning
confidence: 99%
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“…The standards developed for measurement with LDR BT gamma sources are based on ionometry, the most sensitive method for low intensity sources. Three independent designs of large angle ionization chambers have been developed by ENEA [6], LNE-LNHB [8] and PTB [9], respectively.…”
Section: Project: 'Increasing Cancer Treatment Efficacy Using 3d Brac...mentioning
confidence: 99%
“…The National Physical Laboratory (NPL) calibrate 125 I seeds using a well-type secondary standard that is traceable to the NPL primary standard for air kerma [13]. The Laboratoire National Henri Becquerel has designed a circular free-air chamber [14].…”
Section: Brachytherapy Seed Calibrationmentioning
confidence: 99%