An experimental study of the dose distribution in water around<sup>137</sup>Cs tubes used in brachytherapy

Klevenhagen, S C

doi:10.1259/0007-1285-46-552-1073

Cited by 13 publications

(1 citation statement)

References 9 publications

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“…The experimental verification of the radiation distribution at these relatively low dose rates and the steep dose gradients near the radiation sources necessitates detectors of small size and high sensitivity-conflicting requiremen6 difficult to reconcile. A common method is to use a semiconductor detector for the mapping of the relative absorbed dose distribution in combination with an air ionization chamber for determination of the absolute absorbed dose at reference points (Klevenhagen 1973, Siwek et nl 1991. The sensitive volume of a semiconductor detector is sufficiently small with respect to the steep dose gradients and the required spatial resolution.…”

Section: Introductionmentioning

confidence: 99%

Properties of liquid ionization chambers at LDR brachytherapy dose rates

1995

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Properties such as sensitivity, general recombination and reproducibility of liquid-filled parallel-plate ionization chambers for dosimetry in low-dose-rate brachytherapy radiation fields have been evaluated. Two different dielectric liquids, isooctane (C8H(1)8) and tetramethylsilane (Si(CH3)4), have been used as sensitive media in chambers having a coin-shaped sensitive volume of 3 mm in diameter and 1 mm thickness. An electric field strength of 300 kV m-1 was found to be optimal with respect to sensitivity, leakage current and general recombination. At absorbed dose rates from 0.1-100 mGy min-1 the ionization charge measurements at an irradiation time of 1 min showed a reproducibility better than 1%, and a general recombination not exceeding 0.5%. The calibration--absorbed dose to water against ionization charge at a 60Co reference source--did not show any significant change over an observation time of one year for any of the chambers.

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Section: Introductionmentioning

confidence: 99%