In the present report a thermal neutron assembly consisting of a polyethylene cube for calibrating dosimetric instruments at the ENEA Institute for Radiation Protection is described The characterization of such a facility in terms of the spectral neutron fluence and the ambient dose equivalent rates according to the ICRP60 document is illustrated in detail. The study was aimed at characterizing all the components of the neutron and photon field inside the three calibration cavities placed within the polyethylene cube. This was experimentally investigated by means of solid state and nuclear track detectors and at the same time modelled with the Monte Carlo code MCNP. Besides allowing the experimental results to be compared with the calculated dosimetric quantities, this also permitted the detailed assessment of the neutron spectra along the calibration cavities. Special variance reduction algorithms developed at ENEA allowed satisfactory statistics to be obtained over the whole investigated energy domain.

Characterizing a Thermal Neutron Calibration Assembly by Solid State, Nuclear Track Dosemeters and Monte Carlo Technique

Fantuzzi, E.;Monteventi, F.;Morelli, B.;
1998

Abstract

In the present report a thermal neutron assembly consisting of a polyethylene cube for calibrating dosimetric instruments at the ENEA Institute for Radiation Protection is described The characterization of such a facility in terms of the spectral neutron fluence and the ambient dose equivalent rates according to the ICRP60 document is illustrated in detail. The study was aimed at characterizing all the components of the neutron and photon field inside the three calibration cavities placed within the polyethylene cube. This was experimentally investigated by means of solid state and nuclear track detectors and at the same time modelled with the Monte Carlo code MCNP. Besides allowing the experimental results to be compared with the calculated dosimetric quantities, this also permitted the detailed assessment of the neutron spectra along the calibration cavities. Special variance reduction algorithms developed at ENEA allowed satisfactory statistics to be obtained over the whole investigated energy domain.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/20.500.12079/6273
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