SP2 Featured


The single sphere neutron spectrometer (SP2) is a unique tool that allows performing active neutron spectrometry measurements by employing a single device instead of the usual multi-sphere Bonner spectrometers.

Nevertheless, it is characterized by the same high sensitivity and precision in determining the neutron flux over the entire energy range. It reduces at minimum any reproducibility uncertainty and, when employed with the on-line unfolding tool, it can perform real time measurements.

The SP2 core is constituted by 31 active 6LiF-covered Silicon neutron detectors installed over six concentric layers in the moderating assembly, so that they reproduce the spectrometric performance of a six-sphere Bonner sphere spectrometer. The signals are acquired by the built-in electronics and can be either analysed on-line by the built-in unfolding algorithm, or saved as raw data for off-line analysis.

SP2 can be used in a great number of activities related to scientific research, homeland security, cargo inspections, calibration laboratories, characterization of stray radiation fields for radiation protection purposes, periodical quality check of the neutron stray radiation field, and all applications involving the need of a fast and precise measurement of the neutron spectrum.

The response function of the device, calculated via Monte Carlo simulations, is available for either on-line and off-line analysis. The response function and unfolding algorithm have been validated afterthoroughly testing with reference radioactive sources.

SP2 is the ideal device for performing active neutron spectrum measurements in every radiation environment, including mixed stray radiation fields, workplaces characterized by high gamma background and reference calibration laboratories.

Additional Info

  • Main features:
    • Single sphere detector which provides a spectrometric performance equivalent to a six-sphere Bonner Sphere spectrometer
    • Radically innovative and unique device
    • Excellent photon rejection (completely insensitive to photon fields up to 50 mSv/h)
    • Extended-range active neutron spectrometer
    • Portable device with built-in signal processing electronics
    • Energy range from thermal neutrons up to 10 GeV
    • Isotropic response (max variability: ± 2% for neutron reference field of 241Am-Be source)
    • Typical sensitivity of 0.5 cps/µSv/h
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