Journal ArticleDOI
The irradiation of V79 mammalian cells by protons with energies below 2 MeV. Part I: Experimental arrangement and measurements of cell survival.
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Measurements of the survival of V79 Chinese hamster cells suggest that protons are most effective at about 40-50 keV microns-1, and it is shown that the proton RBEs can be reconciled with those of other light ions if plotted against z*2/beta 2 rather than against LET.Abstract:
The relative biological effectiveness (RBE) has been determined for protons with mean energies of 1.9, 1.15 and 0.76 MeV, from measurements of the survival of V79 Chinese hamster cells. The cells are supported as a monolayer and are swept through a beam of scattered protons produced using a 4 MeV Van de Graaff accelerator. An estimation of the dose and unrestricted linear energy transfer (LET) variation within the sensitive volume of the cells is given for the three proton energies. The RBEs for cell survival (relative to 250 kVp X-rays) at the 10 per cent survival level are 1.6, 1.9 and 3.36 for protons with track-average LETs of 17, 24 and 32 keV microns-1 respectively, and the data suggest that protons are most effective at about 40-50 keV microns-1. It is shown that the proton RBEs can be reconciled with those of other light ions if plotted against z*2/beta 2 (where z* is the effective charge and beta is the relative velocity) rather than against LET.read more
Citations
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Journal ArticleDOI
Charged particle track structure parameters for application in radiation biology and radiation chemistry
D.E. Watt,Ali S. Alkharam +1 more
TL;DR: In this article, a detailed description of the quantities calculated and an extended example is given of their application in elucidating the physical mechanisms of radiation-induced biological damage is given.
Journal ArticleDOI
Response to the Letter to the Editor “Estimating RBEs at clinical doses from microdosimetric spectra” [Med. Phys. 25, 1055 (1998)]
P. Pihet,H. G. Menzel +1 more
Journal ArticleDOI
Changes in RBE of 14-MeV (d + T) neutrons for V79 cells irradiated in air and in a phantom: is RBE enhanced near the surface?
TL;DR: The measured values of RBE as function of dose per fraction within the phantom is consistent with the energy of the neutron beam, however, the increased RBE free in air is greater than expected from microdosimetric parameters of the beam.
Dissertation
Induction and rejoining of DNA double-strand breaks in human cells after exposure to ionising radiation: an experimental and modelling approach
TL;DR: Results of this comparative analysis suggest that conventional methods of DSB quantification may be misleading, due to the way they handle the unwanted background damage that is produced during manipulation of the samples.
Journal ArticleDOI
The ESA/IBMP experiment “Seeds”: Biological effects in Arabidopsis embryos
A.R. Kranz,K.E. Gartenbach,M.W. Zimmermann,E. Schopper,B. Baican,Th. Wendnagel,J.U. Schott,C. Heilmann +7 more
TL;DR: In this paper, a more detailed investigation of biological effects caused by cosmic radiation (CR) at special geometric loci of dry seed embryos of Arabidopsis thaliana Heynh was carried out.
References
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Radiation biology in cancer research
R.E. Meyn,H.R. Withers +1 more
TL;DR: This book contains the proceedings of a symposium held in February and March 1979 and represents a timely appearance of the 40 scientific presentations and conference summary from a rather large meeting.
Journal ArticleDOI
Mutation and inactivation of cultured mammalian cells exposed to beams of accelerated heavy ions. II. Chinese hamster V79 cells.
TL;DR: It is suggested that a proportion of the radiation-induced mutants suffer extensive genetic damage, and that some forms of this damage may be induced with high efficiency by radiations of high linear energy transfer.
Journal ArticleDOI
Effects of different ionizing radiations on human cells in tissue culture. III. Experiments with cyclotron-accelerated alpha-particles and deuterons.
TL;DR: Results obtained from cyclotron-accelerated a-particles and deuterons show that in this region the RBE varies rapidly with LET, especially at low levels of damage.
Journal ArticleDOI
RBE-LET Relationship for the Survival of V79 Cells Irradiated with Low Energy Protons
Mauro Belli,Roberto Cherubini,S. Finotto,G. Moschini,Orazio Sapora,Giustina Simone,M. A. Tabocchini +6 more
TL;DR: The data seem to indicate that the RBE-LET curve depends on the type of radiation and this could imply that LET is not a good reference for the dose-effectiveness relationship.