Analysis of 4πγ ionization chamber response using EGS4 Monte Carlo code

Suzuki, Hiroshi; Sibaike, K.; Hashimoto, Hiroyuki; Kawada, Y.; Hino, Y.

doi:10.1016/s0969-8043(97)10060-4

Cited by 19 publications

(11 citation statements)

References 1 publication

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“…7 In the same figures, the EGS4 code results are presented for similar source and detector geometries. 3 As can be seen, the MCNP4B results agree with the EGS4 results and the experimental data. For photon energies larger than 200 keV, the MCNP4B code results agree within less than 3.6% with the EGS4 code results, and within less than 6% with the experimental data for the IG11 chamber.…”

Section: Resultssupporting

confidence: 79%

“…1,2 For example, the energy response results of the EGS4 Monte Carlo code for three different 4 gamma chambers showed a good agreement with the experimental data. 3 In this study, the energy response of IG11 and IG12 chambers from Centronic® was studied using the MCNP4B computer code. Also, the effect of the source position axial displacement on the energy response for different gamma-ray energies was studied.…”

Section: Introductionmentioning

confidence: 99%

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Energy response simulation of 4π gamma ionization chambers using Monte Carlo technique

Aleissa¹

2002

Medical Physics

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The energy response of 4pi gamma re-entrant well-pressurized ionization chambers was calculated using the MCNP4B Monte Carlo computer code. Two different chambers were simulated-one filled with argon and the other with nitrogen gases at 2 MPa pressure. The MCNP4B results were in good agreement with the experimental measurements and the EGS4 Monte Carlo theoretical results. Energy response formulas for both chambers were obtained with respect to the 1.173 MeV gamma energy line of 60Co. Detailed energy response in the low energy region was facilitated by proper curve fitting of the simulation results. The MCNP4B code was also used to examine the effect of the axial displacement of the standard gamma source in the chamber well. The highest chamber response occurs when the source is located at the center position of the well and it decreases with increasing distance from the center. The effect of the source axial position displacement on the chamber energy response is noticeable at medium and high-energy photon energies.

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Section: Resultssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Energy response simulation of 4π gamma ionization chambers using Monte Carlo technique

Aleissa¹

2002

Medical Physics

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“…Up to now, all the processes leading to the construction of the efficiency curve and the explanation of its meaning are clear and straightforward. The only objection concerns the terminology used: the widely and traditionally used adjective 'efficency' is in the author's opinion not correct and is better replaced by 'response', as in [7]. The author of one of the earliest papers in this field also consistently used this term in his publication [8].…”

Section: Common Approachmentioning

confidence: 99%

Interpretation of ionization chamber efficiency curves

Švec¹

2008

Metrologia

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The paper explains relationships between various forms of efficiency curves and derives a new option for the ionization chamber efficiency representation.First, the ionization chamber efficiency term is analysed, being expressed in various units depending on experimental conditions. Then, the efficiency curve concept is explained and discussed. The next section introduces the quantities necessary for a calculation of photon energy conversion efficiency and derives its relationship to the customary form of efficiency curve. The considerations are demonstrated for the example of SIR ionization chambers whose characteristics are essential for activity determination worldwide as they serve as a pointer for international comparisons in the area of activity measurements.

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“…Various methods have been described in literature to estimate the sensitivity of these chambers to different gamma energy values [5][6][7]. The shape of the response curve of a re-entrant cavity chamber as a function of energy is nearly monotonous for energies above 200-300 keV depending on the wall thickness and material of the cavity [6].…”

Section: Calculation Of Responsementioning

confidence: 99%

“…The shape of the response curve of a re-entrant cavity chamber as a function of energy is nearly monotonous for energies above 200-300 keV depending on the wall thickness and material of the cavity [6]. This makes it easy to determine the response curve by fitting experimental data obtained with only a limited number of standard sources of different nuclides.…”

Section: Calculation Of Responsementioning

confidence: 99%