Characterization of the radiation background at the Spallation Neutron Source

We present a survey of the radiation background at the Spallation Neutron Source (SNS) at Oak Ridge National Laboratory, TN, USA during routine daily operation. A broad range of detectors was used to characterize primarily the neutron and photon fields throughout the facility. These include a WENDI-2 extended range dosimeter, a thermoscientific NRD, an Arktis 4He detector, and a standard NaI photon detector. The information gathered from the detectors was used to map out the neutron dose rates throughout the facility and also the neutron dose rate and flux profiles of several different beamlines. The survey provides detailed information useful for developing future shielding concepts at spallation neutron sources, such as the European Spallation Source (ESS), currently under construction in Lund, Sweden.

[1]  G. Ehlers,et al.  Benchmarking shielding simulations for an accelerator-driven spallation neutron source , 2015 .

[2]  K. K. Chipley,et al.  Spallation neutron source target station design, development, and commissioning , 2014 .

[3]  G. Ehlers,et al.  High energy particle background at neutron spallation sources and possible solutions , 2014 .

[4]  Kajimoto Ryoichi,et al.  Recent Improvement of the Signal-to-Noise Ratio on the Fermi Chopper Spectrometer 4SEASONS , 2013 .

[5]  H. Friederich,et al.  Real-time data analysis using the WaveDREAM data acquisition system , 2012, 2012 18th IEEE-NPSS Real Time Conference.

[6]  G. Davatz,et al.  Fast neutron detection with pressurized4He scintillation detectors , 2012 .

[7]  E. Mamontov,et al.  A time-of-flight backscattering spectrometer at the Spallation Neutron Source, BASIS. , 2011, The Review of scientific instruments.

[8]  G. Davatz,et al.  Gamma-insensitive fast neutron detector with spectral source identification potential , 2010, 2010 IEEE International Conference on Technologies for Homeland Security (HST).

[9]  Frank Zimmermann,et al.  Announcement: New Sponsors forPhysical Review Special Topics - Accelerators and Beams , 2008 .

[10]  Kenneth W. Herwig,et al.  The Spallation Neutron Source in Oak Ridge: A powerful tool for materials research , 2006 .

[11]  E. Iverson,et al.  Target station shielding issues at the spallation neutron source. , 2005, Radiation Protection Dosimetry.

[12]  E. Iverson,et al.  The Spallation Neutron Source (SNS) project: a fertile ground for radiation protection and shielding challenges. , 2005, Radiation protection dosimetry.

[13]  E. Schachinger,et al.  The biological shield of a high-intensity spallation source: a Monte Carlo design study , 2002 .

[14]  R. Olsher,et al.  WENDI: an improved neutron rem meter. , 2000, Health physics.

[15]  J. Hayter.  International Collaboration on Advanced Neutron Sources) , 1990 .

[16]  M. Hagen,et al.  Recent progress on HYSPEC, and its polarization analysis capabilities , 2015 .

[17]  E. Iverson,et al.  Methods and procedures for shielding analyses for the SNS , 2014 .

[18]  F. Gallmeier,et al.  Shielding Analyses for VISION Beam Line at SNS , 2014 .