Title: Validating a MCNPX Model of Mg(Ar) and TE(TE) Ionisation Chambers Exposed to 60Co Gamma-rays
Authors: ROCA AntoanetaNIEVAART Victor AlexanderMOSS RaymondSTECHER-RASMUSSEN FinnZAMFIR Nicolae Victor
Citation: RADIATION PROTECTION DOSIMETRY vol. 129 no. 4 p. 365-371
Publication Year: 2008
JRC N°: JRC48460
ISSN: 0144-8420
URI: http://rpd.oxfordjournals.org/
DOI: 10.1093/rpd/ncm484
Type: Articles in periodicals and books
Abstract: For an accurate determination of the absorbed doses in complex radiation fields (e.g. mixed neutron-gamma fields), a better interpretation of the response of ionisation chambers is required. This study investigates a model of the ionisation chambers using a different approach, analysing the collected charge per minute as a response of the detector instead of the dose. The MCNPX Monte Carlo code is used. In this paper, the model is validated using a well-known irradiation field only: a 60Co source. The detailed MCNPX models of a Mg(Ar) and TE(TE) ionisation chamber is investigated comparing the measured charge per minute obtained free-in-air and in a water phantom with the simulated results. The difference between the calculations and the measurements for the TE(TE) chamber is within +2% whereas for the Mg(Ar) chamber is around 17%. The systematic discrepancy in the case of Mg(Ar) chamber is expected to be caused by an overestimation of the sensitive volume.
JRC Directorate:Energy, Transport and Climate

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