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  SINGLE SPHERE NEUTRON SPECTROMETER

SINGLE SPHERE NEUTRON SPECTROMETER

SP2

MAIN FEATURES

• Radically innovative and unique device

• Extended-range active neutron spectrometer

• Portable device with built-in signal processing electronics

• Single sphere detector which provides a  spectrometric performance equivalent to a six-  sphere Bonner Sphere spectrometer

• Energy range from 0。025 eV to 20 MeV (optional extension up to 5 GeV)

• Isotropic response

• Excellent photon rejection (completely insensitive to photon fields up to 50 mSv/h)

• Typical sensitivity of 0.5 cps/µSv/h

 

DESCRIPTION

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 either be analysed  on-line or transmitted for the analysis to an external device for off-line unfolding。

 

TECHNICAL SPECIFICATIONS

• Neutron sensitivity: approximately 0.5 cps/µSv/h

• Gamma rejection: completely insensitive up to 50 mSv/h of gamma continuous background

• 30 cm moderating assembly

• 31 6LiF-covered Silicon active neutron detectors

• Variation of the response with the angle of incidence of the radiation: max ± 2% for 241Am-Be source

• Energy range: from thermal neutrons up to 20 MeV (5 GeV with optional Pb internal shell)

• Temperature range: from 0° to 40°C

• Humidity range: from 0 to 95%, non-condensing

• Total weight with optional Pb shell: approximately 20 kg

• Electrical operation: 50 Hz, 230 V ± 10%

• Maximum counting rate: 105 cps for each acquisition channel

• Maximum H*(10) per burst for use in pulsed fields: 1-5 µSv (depending on the neutron spectrum) 

 

OPTIONALS

• Supply of off-line or on-line (built-in) advance unfolding tools

• Training on unfolding tools for non-expert users

• Faraday cup for extremely noisy environments

• Internal lead shell for range extension up to 5 GeV

• Calibration certificate

 

APPLICATIONS

• Scientific research

• Homeland security

• Cargo inspection

• Calibration laboratories

• Characterization of stray radiation fields for radiation protection purposes

• Periodical quality check of the neutron stray radiation field

• All applications involving the need of a fast and precise measurement of the neutron spectrum


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