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|Title:||Validating a MCNPX Model of Mg(Ar) and TE(TE) Ionisation Chambers Exposed to 60Co Gamma-rays|
|Authors:||ROCA Antoaneta; NIEVAART Victor Alexander; MOSS Raymond; STECHER-RASMUSSEN Finn; ZAMFIR Nicolae Victor|
|Citation:||RADIATION PROTECTION DOSIMETRY vol. 129 no. 4 p. 365-371|
|Publisher:||OXFORD UNIV PRESS|
|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 Institute:||Energy, Transport and Climate|
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