Title of article
Terrestrial thermal neutrons
Author/Authors
M.E.، Nelson, نويسنده , , J.D.، Dirk, نويسنده , , J.F.، Ziegler, نويسنده , , A.، Thompson, نويسنده , , T.H.، Zabel, نويسنده ,
Issue Information
روزنامه با شماره پیاپی سال 2003
Pages
-205
From page
206
To page
0
Abstract
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.
Keywords
Determination , Continuous , Biodegradable dissolved organic carbon , Cell immobilization , bioreactor
Journal title
IEEE Transactions on Nuclear Science
Serial Year
2003
Journal title
IEEE Transactions on Nuclear Science
Record number
86308
Link To Document