Concept of a Neutron Dosemeter Based on a Recoil Particle Track Chamber

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Abstract
A new experimental approach for a neutron dosemeter and spectrometer is presented. It is based on an optically read out time projection chamber (TPC). Charged particles entering a low-pressure sensitive volume of about one litre create ionisation electrons along their track, which are detected and localised using an optoelectronic detection system. This allows type, energy, and direction of neutron-induced secondaries to be analysed. It will therefore be suited as an advanced active neutron monitor for the measurement of dosimetric quantities and will also supply spectrometric information. The method as well as the planned structure and its expected performance are presented. Results are reported that were obtained with a first experimental device which was built to study particle induced light and charge production in electron avalanches in various triethylamine-based gas mixtures.

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