Charge collection efficiency in ionization chambers operating in the recombination and saturation regimes

Chabod, S.

doi:10.1016/j.nima.2009.03.019

Cited by 15 publications

(14 citation statements)

References 9 publications

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“…Within the cluster, the electric field and the mean electric energy may greatly differ from the volume averaged values. This type of recombination can be considered in a more general version of the Thomson formulation as proposed by Chabod [15,16] in which a spacial and time varying Nðr; tÞ is considered. In the case treated here, where the gas is submitted to very high activities, the cluster distribution may be considered uniform.…”

Section: Recombination Regimementioning

confidence: 99%

On the interpretation of current–voltage curves in ionization chambers using the exact solution of the Thomson problem

Ridenti

Pascholati

Gonçalves

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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a b s t r a c tThe I À ΔV characteristic curve of a well type ionization chamber irradiated with 192 Ir sources (0.75 Ci-120 Ci) was fitted using the exact solution of the Thomson problem. The recombination coefficient and saturation current were estimated using this new approach. The saturation current was compared with the results of the conventional method based on Boag-Wilson formula. It was verified that differences larger than 1% between both methods only occurred at activities higher than 55 Ci. We concluded that this new approach is recommended for a more accurate estimate of the saturation current when it is not possible to measure currents satisfying the condition I=I sat 4 0:95. From the calibration curve the average value of pairs of carriers created per unit volume was estimated to be equal to η ¼ 8:1 Â 10 À 3 cm À 3 s À 1 Bq À 1 and from that value it was estimated that $ 17 pairs were created on average per second for each decay of the source.

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Section: Recombination Regimementioning

confidence: 99%

On the interpretation of current–voltage curves in ionization chambers using the exact solution of the Thomson problem

Ridenti

Pascholati

Gonçalves

et al. 2015

Nuclear Instruments and Methods in Physics Research Section A:

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“…Using a perturbation method, we had obtained analytical solutions for (2) with boundary conditions (a) to (c). The corresponding results, gathered in [5]- [7], are used in this paper for the modeling of SMF chambers.…”

Section: A Key Equationsmentioning

confidence: 99%

“…The charge speeds, and , can then be written (7) where and are the electron and ion mobilities. Approximate values for and are given in Table I for rare gases [12].…”

Section: B Modeling Parametersmentioning

confidence: 99%

“…For better predictability, these simulations should include physical models, whose starting point is the formulation of the charge transport equations in gases. In [5]- [7], using iterative perturbation methods we obtained analytical solutions of these equations in the recombination regime. Relying on this mathematical framework, we summarize in Section II the main physical processes at work in SMF chambers.…”

Section: Introductionmentioning

confidence: 99%

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Improvements in the Modeling of Sub-Miniature Fission Chambers Operated in Current Mode

Chabod

Letourneau

Gourdon

et al. 2010

IEEE Trans. Nucl. Sci.

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We review the theoretical basis necessary to model sub-miniature fission chambers operated in current mode. For these detectors, we propose formulae for the lower and upper limits of the saturation zone, obtained through analytical and numerical solutions of the charge transport equations. Using these results, we calculate the voltage width of the saturation plateau, as a function of parameters such as the electrode geometries or the characteristics of the filling gas.

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“…The corresponding results, gathered in [2] - [4], are used in this paper for the fission chamber modelling.…”

Section: A Key Equationsmentioning

confidence: 99%

Improvements in the modelling of micro fission chambers operated in current mode

Chabod

Letourneau

2009

2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and Their Applications

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We recall the theoretical bases necessary to model micro fission chambers operated in current mode. For these detectors, we propose formulae for the lower and upper limits of the saturation zone, obtained through analytical and numerical resolutions of the charge transport equations. Using these results, we calculate the voltage extension of the saturation plateau, as function of parameters such as the electrode geometries or the characteristics of the filling gas.

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Charge collection efficiency in ionization chambers operating in the recombination and saturation regimes

Cited by 15 publications

References 9 publications

On the interpretation of current–voltage curves in ionization chambers using the exact solution of the Thomson problem

On the interpretation of current–voltage curves in ionization chambers using the exact solution of the Thomson problem

Improvements in the Modeling of Sub-Miniature Fission Chambers Operated in Current Mode

Improvements in the modelling of micro fission chambers operated in current mode

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