A novel detector for 2D ion detection in low-pressure gas and its applications

Bashkirov, V.; Hurley, Robert F.; Schulte, R.

doi:10.1109/nssmic.2009.5402061

Cited by 13 publications

(8 citation statements)

References 6 publications

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“…At the James M. Slater MD Proton Treatment and Research Center experimental work on such detector for ions is in progress. Preliminary results indicate that the 2 D ion detector is technically feasible (15). Fig.…”

Section: Resultsmentioning

confidence: 93%

Experimental Validation of Track Structure Models

Bashkirov

Schulte

Wroe

et al. 2009

IEEE Trans. Nucl. Sci.

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A tracking ion counting nanodosimeter was employed to acquire spatial ionization patterns produced by charged particles in propane gas at 1.3 mbar. Data were taken at the James M. Slater MD Proton Treatment and Research Center with 250 MeV, 17 MeV, 5 MeV and 1.5 MeV proton beams, 4.8 MeV alpha particles and electrons from a Sr-90/Y-90 source. For each particle type, measurable quantities used for track structure reconstruction included the number of ionizations and their location within a wall-less, cylindrical sensitive volume measured with a resolution of about 5 tissue-equivalent nanometers, and primary particle coordinates. Measured ionization frequency distributions as a function of distance from particle track were compared with results of a dedicated Monte Carlo track structure code.

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Section: Resultsmentioning

confidence: 93%

Experimental Validation of Track Structure Models

Bashkirov

Schulte

Wroe

et al. 2009

IEEE Trans. Nucl. Sci.

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“…Like an RPC, the RPWELL has the potential to quench sparks and thus extend the dynamic range of the detector. Bashkirov et al [32] demonstrated an ion counter with a similar configuration, using highly resistive glass. Similarly, coupling a THGEM to a glass anode was suggested in [33], however no results were published to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

First studies with the Resistive-Plate WELL gaseous multiplier

et al. 2013

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We present the results of first studies of the Resistive Plate WELL (RPWELL): a single-faced THGEM coupled to a copper anode via a resistive layer of high bulk resistivity. We explored various materials of different bulk resistivity (10 9 − 10 12 Ωcm) and thickness (0.4 − 4 mm). Our most successful prototype, with a 0.6 mm resistive plate of ∼ 10 9 Ωcm, achieved gains of up to 10 5 with 8 keV x-ray in Ne/5%CH 4 ; a minor 30% gain drop occurred with a rate increase from 10 to 10 4 Hz/mm 2 . The detector displayed a full "discharge-free" operation-even when exposed to high primary ionization events. We present the RPWELL detector concept and compare its performance to that of other previously explored THGEM configurations-in terms of gain, its curves, dependence on rate, and the response to high ionization. The robust Resistive Plate WELL concept is a step forward in the Micro-Pattern Gas-Detector family, with numerous potential applications.

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“…Such a detector needs to be able to measure single ionizations over a large area with high resolution. One possible nanodosimetric detector which could be able to measure such cluster sizes along the primary particle track is the track imaging detector currently developed at University of Zurich and firstly suggested by Bashkirov et al 2,[27][28][29][30] The difference of the "fast" method and the "slow and detailed" method when the same Monte Carlo code is used presumably comes from excessive number of electrons in the "slow and detailed" method which ionize outside of the basic interaction volume where they were created. The "fast" method only takes the electrons into consideration which are generated and ionize inside the basic interaction volumes.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Feasibility study of macroscopic simulations of nanodosimetric parameters for proton therapy

et al. 2020

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Purpose In view of the potential of treatment plan optimization based on nanodosimetric quantities, fast Monte Carlo methods for obtaining nanodosimetric quantities in macroscopic volumes are important. In this work, a “fast” method for obtaining nanodosimetric parameters from a clinical proton pencil beam in a macroscopic volume is compared with a slow and detailed method. Furthermore, the variations of these parameters, when obtained with the Monte Carlo codes TOPAS and NOREC, are investigated. Methods Monte Carlo track structure simulations of 1 keV–100 MeV protons and 12 eV–1 MeV electrons in a volume of 8 nm 3 liquid water provided us with an atlas of cluster size distributions. Two kinds of ionization cluster size distributions were recorded, counting all ionizations or only ionizations directly produced by the primary particle. The simulations of the proton pencil beam were performed in two different ways. A “fast” method where only the protons were simulated and a “slow and detailed” method where protons and electrons were simulated in order to obtain spectra at different depths. The obtained spectra were then convoluted with cluster size distributions. Results It was shown that the nanodosimetric quantity F2 from the “fast” method is, depending on the location, between 43.6% and 63.6% smaller than the F2 obtained by the “slow and detailed” method. However, it was also shown that variations of nanodosimetric quantities are even larger when the cluster size distributions of the electrons are simulated with the Monte Carlo code NOREC, that is, the cumulative F2 probabilities obtained with NOREC were between 50.8% and 75.5% smaller than the F2 probabilities obtained with TOPAS. Conclusions As long as the uncertainties of different Monte Carlo codes are not improved, it is feasible to only simulate protons in a macroscopic volume. It must be noted, however, that the uncertainty is in the order of 100%.

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A novel detector for 2D ion detection in low-pressure gas and its applications

Cited by 13 publications

References 6 publications

Experimental Validation of Track Structure Models

Experimental Validation of Track Structure Models

First studies with the Resistive-Plate WELL gaseous multiplier

Feasibility study of macroscopic simulations of nanodosimetric parameters for proton therapy

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