A Synthesized Global Neutron Map

We have synthesized a global neutron map showing relative neutron fluxes at locations all over the world based on the effects of elevation, geomagnetic rigidity, solar cycle, and the presence of ground moisture and/or bodies of water. The modeled values show good agreement with measured data, indicating that the considered factors represent the largest effects on local neutron flux. This synthesized map helps address one of the challenges of reliably sensing potential nuclear threats - the variability of the natural neutron background with location and time.