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The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz

The physical and biological basis of our model to calculate the biological effects of charged particles, termed local effect model (LEM), has been recently questioned in a commentary by R. Katz. Major objections were related to the definition of the target size and the use of the term cross section....

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Autores principales: Scholz, M, Kraft, G
Lenguaje:eng
Publicado: 2004
Materias:
Acceso en línea:http://cds.cern.ch/record/712718
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author Scholz, M
Kraft, G
author_facet Scholz, M
Kraft, G
author_sort Scholz, M
collection CERN
description The physical and biological basis of our model to calculate the biological effects of charged particles, termed local effect model (LEM), has been recently questioned in a commentary by R. Katz. Major objections were related to the definition of the target size and the use of the term cross section. Here we show that the objections raised against our approach are unjustified and largely based on serious misunderstandings of the conceptual basis of the local effect model. Furthermore, we show that the approach developed by Katz and coworkers itself suffers from exactly those deficiencies, for which Katz criticises our model. The essential conceptual differences between the two models are discussed by means of some illustrative examples, based on a comparison with experimental data. For these examples, the predictions of the LEM model are fully consistent with the experimental data. Contrarily, e.g. for very heavy ions there are significant discrepancies observed for the Katz approach. These discrepancies can be attributed to the inadequate definition of the target size in this model. Experimental data are thus clearly in favor of the definition of the target as used in the local effect model. But also for protons, agreement with experimental data is achieved within the Katz approach only at the cost of questionable approximations in combination with the violation of the fundamental physical principle of energy conservation.
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spelling cern-7127182019-09-30T06:29:59Zhttp://cds.cern.ch/record/712718engScholz, MKraft, GThe physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. KatzHealth Physics and Radiation EffectsThe physical and biological basis of our model to calculate the biological effects of charged particles, termed local effect model (LEM), has been recently questioned in a commentary by R. Katz. Major objections were related to the definition of the target size and the use of the term cross section. Here we show that the objections raised against our approach are unjustified and largely based on serious misunderstandings of the conceptual basis of the local effect model. Furthermore, we show that the approach developed by Katz and coworkers itself suffers from exactly those deficiencies, for which Katz criticises our model. The essential conceptual differences between the two models are discussed by means of some illustrative examples, based on a comparison with experimental data. For these examples, the predictions of the LEM model are fully consistent with the experimental data. Contrarily, e.g. for very heavy ions there are significant discrepancies observed for the Katz approach. These discrepancies can be attributed to the inadequate definition of the target size in this model. Experimental data are thus clearly in favor of the definition of the target as used in the local effect model. But also for protons, agreement with experimental data is achieved within the Katz approach only at the cost of questionable approximations in combination with the violation of the fundamental physical principle of energy conservation.EXT-2004-087EXT-2004-089GSI-2004-02oai:cds.cern.ch:7127182004-01-15
spellingShingle Health Physics and Radiation Effects
Scholz, M
Kraft, G
The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz
title The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz
title_full The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz
title_fullStr The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz
title_full_unstemmed The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz
title_short The physical and radiobiological basis of the Local Effect Model (LEM): A response to the commentary by R. Katz
title_sort physical and radiobiological basis of the local effect model (lem): a response to the commentary by r. katz
topic Health Physics and Radiation Effects
url http://cds.cern.ch/record/712718
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