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Radiation Protection Dosimetry 2004 110(1-4):533-537; doi:10.1093/rpd/nch278
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Radiation Protection Dosimetry Vol. 110 Nos. 1-4 © Oxford University Press 2004; all rights reserved

A telescope-design directional neutron spectrometer

F. d'Errico1,2,*, V. Giusti2, M. Reginatto3 and B. Wiegel3

1 Department of Therapeutic Radiology, Yale University School of Medicine, 333 Cedar St, New Haven, CT 06510, USA
2 Dipartimento di Ingegneria Meccanica, Nucleare e della Produzione, Università degli Studi di Pisa, 2 via Diotisalvi, I-56126 Pisa Italy
3 Physikalisch-Technische Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany

* Corresponding author: francesco.derrico{at}yale.edu.

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°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.


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