Energy Deposition by Heavy Ions in a "Tissue Equivalent" Gas

Varma, M.N.; Baum, J.W.; Kuehner, A.V.

doi:10.2307/3574178

Cited by 60 publications

(15 citation statements)

References 6 publications

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“…An adaptation of the MC simulation by Kra¨mer (TRAX code [2]) for the geometry and the presence of an electrical field in OPAC has already been developed. The code itself was designed to simulate the emission and transport of d-electrons after heavy-ion impact.…”

Section: Article In Pressmentioning

confidence: 99%

“…The advantage of this method, compared with the conventional radial-dose measurements (e.g. with ionisation chambers [2] or TEPC [3]), is the possibility to measure the whole D(r) function in one step and without averaging over larger volumes due to the rather large size of those chambers. Besides that, it is possible to determine stochastic quantities (like cluster size distribution [3]) only accessible by single-particle measurements.…”

Section: Introductionmentioning

confidence: 99%

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High-resolution heavy ion track structure imaging

Laczko¹,

Dangendorf²,

Krämer³

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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Radiation action in matter depends on the details of the spatial distribution of energy transfer events on the nanometer scale. In this contribution, we present an instrument for experimental investigation of spatial ionisation patterns of ions in matter. The experimental system is based on a time projection chamber with a parallel drift field, parallel-plate charge and light amplification layers and optical readout with an image-intensified CCD camera (OPtical Avalanche Chamber (OPAC)). The chamber is operated with low pressure gas (4-40 hPa) to achieve a resolution of down to 50 nm in tissue density. Preliminary results of measurements and simulations are presented. r

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Section: Article In Pressmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

High-resolution heavy ion track structure imaging

Laczko¹,

Dangendorf²,

Krämer³

et al. 2004

Nuclear Instruments and Methods in Physics Research Section A:

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“…9,10 Especially in case of ion beam induced reactions, core and penumbra models of the energy distribution have been proposed on both experimental and theoretical bases by several groups. [11][12][13][14][15] The spatial distribution of energy deposited by charged ions is expected to govern the chemical reactions.…”

Section: Effect Of Ion Beam Energy and Polymer Weight On The Thicknesmentioning

confidence: 99%

Effect of ion beam energy and polymer weight on the thickness of nanowires produced by ion bombardment of polystyrene thin films

Tsukuda

Seki

Tagawa

et al. 2005

Applied Physics Letters

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Exposure of polystyrene to MeV-order heavy-ion beams produces nanowires by cross-linking along ion tracks. The chemical core of these ion tracks is visualized, and the dependence of the diameter of the nanowires on the linear energy transfer of the ion beam and molecular weight of the polymer are investigated precisely based on the model of transformation of a nanowire cross section into an ellipse. an equation is derived to predict the radius (5.6–27.6 nm) of the chemical core considering the energy density required for gelation of the polymer, and the validity of the relation is confirmed against experimental results.

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“…Measuring the deposited dose D(r) as a function of radial distance r from the ion beam path provides information on the spatial distribution of deposited energy. Much data have been collected since 1960s for protons (1 -7) , deuterons (3) and the particles of helium (4,8,9) , carbon (9,10) , nitrogen (11) , oxygen (9,12,13) , neon (11,14) , silicon (11) , iron (10, 15 -17) , nickel (18) , germanium (19,20) , bromine (21) , iodine (12) and uranium (19) using tissue-equivalent proportional counters (TEPC) or tissue-equivalent ion chambers. Data on the stochastic depositions of energy such as the lineal energy distribution (22) yf(y) are also of great importance for the verification of theoretical models applied to the evaluation of relative biological effectiveness (RBE) of radiation therapy (23 -27) , and track structure models (28 -33) have been verified and improved on the basis of the data from radial dose distributions.…”

Section: Introductionmentioning

confidence: 99%

MEASUREMENT OF THE STOCHASTIC RADIAL DOSE DISTRIBUTION FOR A 30-MeV PROTON BEAM USING A WALL-LESS TISSUE-EQUIVALENT PROPORTIONAL COUNTER

Tsuda

Sato

Ogawa

2015

Radiat Prot Dosimetry

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The frequency distribution of the lineal energy, y, of a 30-MeV proton beam was measured as a function of the radial distance from the beam path, and the dosed mean of y; y D ; was obtained to investigate the radial dependence of y D : A wall-less tissueequivalent proportional counter, in a cylindrical volume with simulated diameters of 0.36, 0.72 and 1.44 mm was used for the measurement of y distributions, yf( y). The measured values of yf(y) summed in the radial direction agreed fairly well with the corresponding data taken from the microdosimetric calculations using the PHITS code. The y D value of the 30-MeV proton beam presented its smallest value at r 5 0.0 and gradually increased with radial distance, and the y D values of heavy ions such as iron showed rapid decrease with radial distance. This experimental result demonstrated that the stochastic deposited energy distribution of high-energy protons in the microscopic region is rather constant in the core as well as in the penumbra region of the track structure.

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Energy Deposition by Heavy Ions in a "Tissue Equivalent" Gas

Cited by 60 publications

References 6 publications

High-resolution heavy ion track structure imaging

High-resolution heavy ion track structure imaging

Effect of ion beam energy and polymer weight on the thickness of nanowires produced by ion bombardment of polystyrene thin films

MEASUREMENT OF THE STOCHASTIC RADIAL DOSE DISTRIBUTION FOR A 30-MeV PROTON BEAM USING A WALL-LESS TISSUE-EQUIVALENT PROPORTIONAL COUNTER

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