Cosmic ray induced neutron background sources and fluxes for geometries of air over water, ground, iron, and aluminum

Details Cosmic ray induced neutron background sources and fluxes for geometries of air over water, ground, iron, and aluminum Cosmic ray induced neutron background sources and fluxes for geometries of air over water, ground, iron, and aluminum

Jan 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978jgr....83..114o&link_type=abstract

Journal of Geophysical Research, vol. 83, Jan. 1, 1978, p. 114-120.

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15

Air Land Interactions, Air Water Interactions, Background Radiation, Cosmic Rays, Neutron Sources, Aluminum, Carbon 14, Iron, Neutron Flux Density, Transport Properties

Scientific paper

The work reported here has applications in neutron detection and C-14 dating. In detection, one wants to measure a signal in the presence of the natural neutron background created by primary cosmic ray particles incident on the atmosphere. Neutron sources created by these cosmic rays and resulting fluxes are calculated as a function of depth in air, seawater, ground, iron, and aluminum. The analytical generation of cosmic ray neutron sources as a function of depth in various materials is noted. Good agreement is obtained with experimental data for both neutron spectra and fluxes in the air over ground geometry. The air/seawater geometry has the lowest cosmic ray induced interface neutron flux (3.1 x 10 to the -3 neutrons/sq cm s) followed by air/ground (6.4 x 10 to the -3), air/aluminum 2.1 x 10 to the -2), and the highest interface value for air/iron (7.7 x 10 to the -2 neutrons/sq cm s).

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