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Terrestrial thermal neutrons
2003 / IEEE
This item was taken from the IEEE Periodical ' Terrestrial thermal neutrons ' The first NIST-traceable measurements of environmental thermal neutrons have been completed. The average sea level flux of thermal neutrons is 4 cm/sup 2//hr. This flux changes less than two times over wide varieties of terrain, in all weather conditions and over the solar year. The neutron flux is normalized to 39N-76.5W. This flux scales with geomagnetic Lat/Long and with altitude in a manner similar to the flux of incident energetic cosmic rays. The shielded flux has been measured under 450 g/cm/sup 2/, with a residual flux of 0.1 times the sea-level value. Preliminary shielding studies inside buildings and under water shows significant variability in the thermal neutron mean attenuation coefficient.
Geophysical Aspects Of Cosmic Rays
Thermal Neutron Mean Attenuation Coefficient
Terrestrial Thermal Neutrons
Environmental Thermal Neutrons
Incident Energetic Cosmic Rays
Cosmic Ray Neutrons
Radiation Hardening (electronics)
Average Sea Level Flux