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.
ROCA Antoaneta;
NIEVAART Victor Alexander;
MOSS Raymond;
STECHER-RASMUSSEN Finn;
ZAMFIR Nicolae Victor;
2008-12-05
OXFORD UNIV PRESS
JRC48460
0144-8420,
http://rpd.oxfordjournals.org/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC48460,
10.1093/rpd/ncm484,
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