Abstract
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.
Highlights
Spallation neutron sources provide scientists with intense fluxes of cold and thermal neutrons for condensed matter investigations
The highest dose rate measured with the WENDI-2 was ∼25 μSv/hr, indicated by the red color in the map, which was in region (E) on top of a gap between an instrument shielding block and the monolith wall
In summary, we carried out measurements at the Spallation Neutron Source (SNS) during routine user operation in order to understand the radiation leaking from the shielding structures
Summary
Spallation neutron sources provide scientists with intense fluxes of cold and thermal neutrons for condensed matter investigations. The information gathered from the detectors was used to map out the neutron dose rates throughout the facility and the neutron dose rate and flux profiles of several different beamlines.
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