Terrestrial thermal neutrons

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...

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Veröffentlicht in:IEEE transactions on nuclear science 2003-12, Vol.50 (6), p.2060-2064
Hauptverfasser: Dirk, J.D., Nelson, M.E., Ziegler, J.F., Thompson, A., Zabel, T.H.
Format: Artikel
Sprache:eng
Schlagworte:
Altitude
Attenuation
Attenuation coefficients
Cosmic rays
Geomagnetism
Military computing
Neutron flux
Neutrons
Nuclear electronics
Pollution measurement
Rain
Sea level
Sea measurements
Thermal neutrons
Weather conditions
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Beschreibung
Zusammenfassung: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.
ISSN:0018-9499
1558-1578
DOI:10.1109/TNS.2003.821587