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Bonner Sphere System with Active Detector for Measurements in Pulsed Neutron Fields

Eike Hohmann, Marlies Luszik-Bhadra, Helmut Schuhmacher, Burkhard Wiegel, Georg Fehrenbacher

Nuclear Technology

Volume 172 / Number 3 / December 2010 / Pages 273-277


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Recent developments in accelerator physics have led to new challenges for radiation protection dosimetry. As is well known, the ambient dose equivalent indicated by area monitors in high-energy neutron fields behind shielding is often unreliable. Therefore, it is desirable to measure the spectrum and to do "in-field" calibrations using the spectral information as reference. For this purpose, the PTB NEMUS (an extended-range Bonner sphere spectrometer) was modified with a new active thermal neutron detector based on silver activation capable of measuring in intense pulsed fields with high energies and fluence rates.

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