PMID: 9533134Apr 9, 1998Paper

The effect of delta rays on the ionometric dosimetry of proton beams

Physics in Medicine and Biology
E CasnatiA Tartari

Abstract

The interface effects arising in the measurement of absorbed dose by ionization chambers, owing to the inhomogeneity between the walls and the gas, have been evaluated by an analytical model. The geometrical situation considered here is appropriate for representing the behaviour of a plane-parallel ionization chamber exposed to a radiotherapeutic beam of protons. Two gases, dry air and tissue equivalent gas (methane based), as well as six materials commonly used in ionization chamber walls, i.e. graphite, A-150 tissue equivalent plastic, C-522 air equivalent plastic, nylon type 6, polymethyl methacrylate and polystyrene, have been examined. The analysis of the results shows that, within the limits of the detector dimensions and proton energies commonly used in the dosimetry of radiotherapeutic beams, these effects, if not taken into account in the measurement interpretation, can entail deviations of up to about 2% with respect to the correct absorbed dose in gas.

References

Jan 1, 1991·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·S VynckierD T Jones
Oct 1, 1986·Physics in Medicine and Biology·P L PettiR Wilson
Aug 1, 1995·Physics in Medicine and Biology·J V SiebersM F Moyers
Aug 1, 1994·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·S VynckierD T Jones

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Citations

Aug 6, 1999·Radiotherapy and Oncology : Journal of the European Society for Therapeutic Radiology and Oncology·S VatnitskyC Bloch
Sep 12, 2002·Physics in Medicine and Biology·Hugo PalmansStefaan Vynckier
Jan 12, 2000·Radiation Research·H BichselK Omata

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