AMES collaborative study of cosmic ray neutrons - Mid-latitude flights

Details AMES collaborative study of cosmic ray neutrons - Mid-latitude flights AMES collaborative study of cosmic ray neutrons - Mid-latitude flights

Apr 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978heaph..34..375h&link_type=abstract

Health Physics, vol. 34, Apr. 1978, p. 375-384. ERDA-supported research.

Physics

3

Airborne Equipment, Cosmic Rays, Geomagnetic Latitude, Ionizing Radiation, Midlatitude Atmosphere, Neutron Flux Density, Energy Spectra, Flux Density, Neutron Spectra, Radiation Protection, Secondary Cosmic Rays, Tropopause

Scientific paper

Three aircraft flights at 12.5 km have yielded data on cosmic-ray neutron-flux densities, neutron dose equivalent rates, and exposure rates for ionizing radiation. The data, collected at 45, 38, and 48 degrees N, indicate: (1) neutron dose equivalent rates of 0.20, 0.14, and 0.22 mrem/hour, (2) exposure rates from the ionizing component of 0.37, 0.31, and 0.41 mR/hour, (3) that the dose equivalent from 3-13-MeV neutrons is 30% of the total for all neutrons, (4) that exposure rates decrease exponentially with decreasing pressure altitude with a 140 g/sq cm attenuation length at 43 degrees N geomagnetic latitude, and (5) that the ionizing component of cosmic ray secondaries is less sensitive to latitude changes than the neutron component.

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