A telescope-design directional neutron spectrometer

Radiation Protection Dosimetry
F d'ErricoB Wiegel

Abstract

A directional spectrometer that uses a superheated emulsion of dichlorotetrafluoroethane at the centre of a 30 cm diameter moderating-sphere of nylon-6. The system has a telescope-design wherein the detector views a narrow solid angle of about 1/6 steradians. The hydrogenous sphere effectively attenuates laterally incident neutrons, thus providing a strong angular dependence of the response. The central detector is sequentially operated at seven temperatures between 25 and 55 degrees C in order to generate a matrix of nested response functions suitable for few-channel spectrometry. The response matrix of the system has been determined by calibrations with monoenergetic neutrons and by Monte Carlo neutron transport calculations. The double-differential unfolding method developed for this system applies the principle of maximum entropy and allows for the rigorous use of all a priori information. The spectrometer is intended for use in the mixed neutron/photon fields encountered in the nuclear power industry, being suitable for spatially distributed radiation sources with maximum neutron energies up to 10 MeV.

References

Sep 11, 2001·Radiation Protection Dosimetry·F d'ErricoB R Siebert
Sep 9, 2004·Radiation Protection Dosimetry·M ReginattoF d'Errico

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Citations

Sep 9, 2004·Radiation Protection Dosimetry·T Bolognese-MilsztajnD Derdau

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