In recent years IRSN has developed tissue-equivalent proportional counters (TEPCs) for neutron monitoring. A detector with a multi-element geometry was studied for personal dosimetry purposes. The determination of the personal dose equivalent using a multi-element TEPC requires to calculate the mean chord length of the charged particles in the counter gas. This paper presents the results of the simulations using the MCNPX code and explains the influence of the gas parameters on the mean chord length and the consequences on the dose equivalent response.
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