PMID: 9547502Apr 21, 1998Paper

Lithium borate TLD for determining the backscatter factors for low-energy x rays: comparison with chamber-based and Monte Carlo derived values

Medical Physics
D Coudin, G Marinello

Abstract

Recently, new backscatter factors for low-energy x rays derived from Monte Carlo calculations have been recommended in the UK code of practice for kilovoltage dosimetry published by (IPEMB). As these data, presented as a function of half-value layer, do not take account of the variation of the x-ray spectra for a given HVL, we have undertaken an experimental study in order to determine BSG for the beam qualities provided by a Darpac 2000 therapy unit. A RTL detector such as Li2B4O7:Cu and parallel-plate ion chambers specially designed for low-energy x-ray dosimetry have been used. The results obtained show very good agreement between the TLD and the Monte Carlo calculations, confirming values obtained by other authors with lithium borate TLD. On the contrary, the results obtained with plane-parallel ion chambers show discrepancies up to 9% that are discussed.

References

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Citations

Feb 16, 2008·Australasian Physical & Engineering Sciences in Medicine·M J ButsonP K N Yu
May 3, 2011·Australasian Physical & Engineering Sciences in Medicine·L SmithZ Kuncic
Dec 29, 2007·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·Martin J ButsonMichael Bailey
Sep 6, 2018·Physics in Medicine and Biology·E A HewsonR Hill
Apr 4, 2007·Physics in Medicine and Biology·Ning WenBenjamin Movsas
Mar 4, 2014·Physics in Medicine and Biology·Robin HillClive Baldock
Mar 11, 1999·Physics in Medicine and Biology·C M Ma, J P Seuntjens

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