Measurement of Ionization Distributions in Tissue-Equivalent Gas

Glass, W.A.; Roesch, W. C.

doi:10.2307/3573409

Cited by 22 publications

(5 citation statements)

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“…It should be noticed that the size of the target volume used in this work is markedly smaller than the target volumes used in previous experiments, which ranged from 125 nm to 1.3 µm at a density of 1 g cm −3 (Glass and Roesch 1972, Gross and Rodgers 1972, Kliauga and Rossi 1976, Toburen et al 1990, Schmollack et al 2000. These previous experiments were based on the measuring technique developed by Rossi and Rosenzweig (1955) using movable wall-less proportional counters immersed in a large container filled with a tissue-equivalent gas mixture to measure the fluctuation of energy which is absorbed in a target volume due to charged particles penetrating through or passing by.…”

Section: Discussionmentioning

confidence: 77%

Track structure of light ions: experiments and simulations

et al. 2012

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To study the track structure of light ions, a measuring device has been developed at the Legnaro National Laboratory of INFN, which can be used to investigate separately the penumbra region of particle tracks and the trackcore region, which is a few nanometres in diameter. The device is based on single-electron counting techniques by means of a gas detector; it simulates a 'nanometre-sized' biological volume of about 20 nm in diameter that can be moved with respect to a narrow particle beam to measure the ionizationcluster-size distributions caused within the target volume by the passage of single primary particles, as a function of the impact parameter. To investigate the ionization-cluster-size formation caused by primary particles of medical interest when they penetrate through or pass by the target volume at a specified impact parameter, measurements and Monte Carlo simulations were performed for 20 MeV protons, 16 MeV deuterons, 48 MeV 6 Li-ions, 26.7 MeV 7 Li-ions and 96 MeV 12 C-ions. The detailed analysis of the resulting distributions showed that in the track-core region their shape is mainly determined by the mean free ionization path length of the primary particles, whereas in the penumbra region the shape of the distributions is almost independent of the impact parameter, and also of the particle type and velocity.

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Section: Discussionmentioning

confidence: 77%

Track structure of light ions: experiments and simulations

et al. 2012

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“…The quantity ?~D then results from Eq.. (7). This method is to derive the function t (x) directly for the mixed field of recoil protons, and then to derive the quantity yD.…”

Section: Large Sltesmentioning

confidence: 99%

“…(7). These measurements have b, from the center of a spherical [8,22,23] or cylindrical [7] wall-less proportional counter. In conclusion we will consider a special situation which corresponds to recent microdosimetric measurements [7,8,22,23].…”

Section: T(x) = Tô(x)+ Te(x)l (21)mentioning

confidence: 99%

Concepts of microdosimetry

Kellerer

Chmelevsky

1975

Radiat Environ Biophys

106

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This is the last part of an investigation of microdosimetric concepts relevant to numerical calculations. A formula is derived which permits the computation of the dose average lineal energy, yC, or the corresponding average of the specific energy without the need to determine the probability distributions, f(y) or f1(z). A detailed treatment is given for two cases of practical importance. The first case corresponds to spherical sites with diameters of the order of 1 mum and to neutrons up to 15 MeV. The second case corresponds to microscopic sites which are small enough that the change of the stopping power of charged particles traversing the site can be neglected.

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“…Note that the frequency of zeros is high because the actual proton path length within the site is zero. Also, the relative widths of the distributions are significantly larger than for diametric tracks, a behavior which was first observed experimentally and explained by Glass and Roesch (1972) • The calculated frequency of zero ionization for diametric tracks produced by 1.0-MeV protons is shown in Figure 35. Straight lines join successive points merely to aid the eye.…”

Section: Calculation Of Distributions For Energymentioning

confidence: 66%

“…A description of the primary interaction model and initial tests of the code for ion track structure calculations, including comparisons with experimentally measured ionization frequency distributions (Glass and Roesch 1972), were reported previously Wil son 1977).…”

Section: Calculation Of Distributions For Energymentioning

confidence: 99%

Pacific Northwest Laboratory Annual Report for 1979 to the DOE Assistant Secretary for Environment Part 4 Physical Sciences

Nielsen¹

1980

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NO T I CEThis report was prepared as an account of work spon sore d by the United Stat es Gove rnme nt. Neithe r the Uni ted States nor the Dep.a rt ment of Ene rgy, nor any of the ir employees, nor an y of their contractors, subcontractors, or their employees, makes a ny wa rran ty, ex press or im pli ed, o r assumes an y legal liability or responsibility for the accuracy, com plete ne ss or usefu lne ss of any information, appa ratus, prod uct or process disclosed, or represents that its use wo uld not infri nge priva te ly o wne d rights.The vi e ws, opinions and co ncl us ions con ta ined in thi s repo rt are those of the contractor and do not necessa rily represent those o f the Activities of the scientists whose work is described in this annual report are broader in scope than the articles indicate. PNL staff have responded to numerous requests from DOE during the year for planning, for service on various task groups, and for special assistance.

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Measurement of Ionization Distributions in Tissue-Equivalent Gas

Cited by 22 publications

References 0 publications

Track structure of light ions: experiments and simulations

Track structure of light ions: experiments and simulations

Concepts of microdosimetry

Pacific Northwest Laboratory Annual Report for 1979 to the DOE Assistant Secretary for Environment Part 4 Physical Sciences

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