Comments on recent measurements of the stopping power of liquid water

García-Molina, Rafael; Abril, Isabel; Vera, Pablo de; Paul, H.

doi:10.1016/j.nimb.2013.01.038

Cited by 13 publications

(14 citation statements)

References 12 publications

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“…From the above discussion we conclude that our theoretically calculated electronic stopping power of liquid water for protons is compatible with the energy-loss measurements performed in cylindrical jets by the Kyoto group [17]. However, we estimate that the stopping power values they derive, on the basis of using two fitting parameters in their simulations (the scaling factor for the stopping power together with the jet diameter) are 10% lower than our estimate, which is in agreement with other models and experiments at larger energies [26].…”

Section: Resultssupporting

confidence: 91%

“…In recent times, two experiments concerning the stopping power of liquid water for proton beams have been reported. The one by the Kyoto group [14][15][16][17], for energies from 0.3-2 MeV, appears to be about 10% low with respect to current theories [26]. Whereas the other one by the Jyväskylä group [18], for proton energies from 4.8-15.2 MeV, agrees nicely with the Bethe theory and other theoretical calculations.…”

Section: Introductionsupporting

confidence: 73%

“…The discrepancy in the liquid water stopping power for protons between our theoretical calculations and the experimental data from the Kyoto group [26] has stimulated us to perform simulations of its experimental setup, and to try to reproduce the projectile energy spectra after the irradiation of cylindrical targets by means of the SEICS code, where our theoretical value of the electronic stopping power is used as input data, without further refitting it.…”

Section: Calculation Of the Electronic Stopping Power Of Light Ions Imentioning

confidence: 99%

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Simulation of the energy spectra of swift light ion beams after traversing cylindrical targets: a consistent interpretation of experimental data relevant for hadron therapy

2019

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We have performed detailed simulations of the energy spectra, recorded at several angles, of proton and helium ion beams after traversing thin cylindrical targets of different nature (liquid water and ethanol jets, as well as a solid aluminium wire), in order to reproduce a series of measurements intended to assess the stopping power of 0.3-2 MeV ions. The authors of these experiments derived values of the stopping power of liquid water (a quantity essential for the evaluation of radiation effects in materials, particularly for radiotherapy purposes) that are ∼10% lower than what is expected from other measurements and theories. In our simulations, instead of treating the stopping power as an unknown free parameter to be determined, we use as input the electronic stopping power accurately calculated within the dielectric formalism. We take into account in the simulations the different interactions that each projectile can experience when moving through the target, such as electronic stopping, nuclear scattering or electron charge-exchange processes. The detailed geometry of the target is also accounted for. We find that our simulated energy distributions are in excellent agreement with the published measurements when the diameter of the cylindrical targets is slightly reduced, what is compatible with the potential evaporation of the liquid jets. On the basis of such an excellent agreement, we validate the accuracy of the model we use to calculate electronic excitation cross sections for ions in condensed matter in its range of applicability (particularly the electronic stopping power) needed for charged particle transport models, and we offer a consistent, but alternative, interpretation for these experiments on ion irradiation of cylindrical targets. Contribution to the Topical Issue "Dynamics of Systems on the Nanoscale", edited by Ilko Bald, Ilia A. Solov'yov, Nigel J. Mason and Andrey V. Solov'yov.

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Section: Resultssupporting

confidence: 91%

Section: Introductionsupporting

confidence: 73%

Section: Calculation Of the Electronic Stopping Power Of Light Ions Imentioning

confidence: 99%

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Simulation of the energy spectra of swift light ion beams after traversing cylindrical targets: a consistent interpretation of experimental data relevant for hadron therapy

2019

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“…Several theoretical approaches exist to study the energy loss of charged particles in liquid water [18][19][20][21][22], which can account for the general trends observed in the experimental data. Even though controversial results about the experimental stopping power derived from a proton beam incident on a liquid water jet have recently been discussed [23]. Regarding other organic and biological materials present in soft tissues, an empirical parametrization for obtaining their excitation spectrum has been proposed, which allows an accurate calculation of their stopping powers [24].…”

Section: Introductionmentioning

confidence: 99%

Energy deposition of H and He ion beams in hydroxyapatite films: A study with implications for ion-beam cancer therapy

et al. 2014

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Ion-beam cancer therapy is a promising technique to treat deep-seated tumors; however, for an accurate treatment planning, the energy deposition by the ions must be well known both in soft and hard human tissues. Although the energy loss of ions in water and other organic and biological materials is fairly well known, scarce information is available for the hard tissues (i.e., bone), for which the current stopping power information relies on the application of simple additivity rules to atomic data. Especially, more knowledge is needed for the main constituent of human bone, calcium hydroxyapatite (HAp), which constitutes 58% of its mass composition. In this work the energy loss of H and He ion beams in HAp films has been obtained experimentally. The experiments have been performed using the Rutherford backscattering technique in an energy range of 450-2000 keV for H and 400-5000 keV for He ions. These measurements are used as a benchmark for theoretical calculations (stopping power and mean excitation energy) based on the dielectric formalism together with the MELF-GOS (Mermin energy loss function-generalized oscillator strength) method to describe the electronic excitation spectrum of HAp. The stopping power calculations are in good agreement with the experiments. Even though these experimental data are obtained for low projectile energies compared with the ones used in hadron therapy, they validate the mean excitation energy obtained theoretically, which is the fundamental quantity to accurately assess energy deposition and depth-dose curves of ion beams at clinically relevant high energies. The effect of the mean excitation energy choice on the depth-dose profile is discussed on the basis of detailed simulations. Finally, implications of the present work on the energy loss of charged particles in human cortical bone are remarked.

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“…The energy loss of ions in water is another subject that has deserved special attention due to its application in tumour therapy. The experimental stopping power data available in the literature [18,19] corresponds to solid, vapour and, recently, to liquid water too [20,21], as reported in [18] and [22]. We will focus our comparison on the stopping power data of protons in vapour [23][24][25][26], but we will also compare it with the liquid and solid phase data at high energies.…”

Section: Introductionmentioning

confidence: 99%

Neonization method for stopping, mean excitation energy, straggling, and for total and differential ionization cross sections of CH₄, NH₃, H₂O and FH by impact of heavy projectiles

Montanari

Miraglia

2013

J. Phys. B: At. Mol. Opt. Phys.

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We propose a neonization method to deal with molecules composed by hydrides of the second row of the periodic table of elements: CH 4 , NH 3 , OH 2 and FH. This method describes these ten-electron molecules as dressed atoms in a pseudo-spherical potential. We test it by covering most of the inelastic collisional magnitudes of experimental interest: ionization cross sections (total, single and double differential), stopping power, energy-loss straggling and mean excitation energy. To this end, the neonization method has been treated with different collisional formalisms, such as the continuum-distorted-wave-eikonal-initial-state, the first order Born, and the shell-wise local plasma approximations. We show that the present model reproduces the different empirical values with high reliability in the intermediate to high-energy region. We also include the expansion of the spherical wave functions in terms of Slater-type orbitals and the analytic expression for the spherical potentials. This makes it possible in the future to tackle present neonization strategy with other collisional models.

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Comments on recent measurements of the stopping power of liquid water

Cited by 13 publications

References 12 publications

Simulation of the energy spectra of swift light ion beams after traversing cylindrical targets: a consistent interpretation of experimental data relevant for hadron therapy

Simulation of the energy spectra of swift light ion beams after traversing cylindrical targets: a consistent interpretation of experimental data relevant for hadron therapy

Energy deposition of H and He ion beams in hydroxyapatite films: A study with implications for ion-beam cancer therapy

Neonization method for stopping, mean excitation energy, straggling, and for total and differential ionization cross sections of CH₄, NH₃, H₂O and FH by impact of heavy projectiles

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Comments on recent measurements of the stopping power of liquid water

Cited by 13 publications

References 12 publications

Simulation of the energy spectra of swift light ion beams after traversing cylindrical targets: a consistent interpretation of experimental data relevant for hadron therapy

Simulation of the energy spectra of swift light ion beams after traversing cylindrical targets: a consistent interpretation of experimental data relevant for hadron therapy

Energy deposition of H and He ion beams in hydroxyapatite films: A study with implications for ion-beam cancer therapy

Neonization method for stopping, mean excitation energy, straggling, and for total and differential ionization cross sections of CH4, NH3, H2O and FH by impact of heavy projectiles

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Product

Resources

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Neonization method for stopping, mean excitation energy, straggling, and for total and differential ionization cross sections of CH₄, NH₃, H₂O and FH by impact of heavy projectiles