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The composition of cosmic rays near solar maximum at 54
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absorbed dose rate actinium activity altitude areas Atomic average beta bone calculated charged particle contribution cosmic radiation cosmic-ray cosmogenic radionuclides daughter products decay products deposition distribution dose commitment dose equivalent rate earth's emitters energy Environmental equilibrium estimated exposure external factor fallout fission products fraction galactic gamma radiation geomagnetic Geophys gonads half-life Harley Health and Safety Health Phys Holtzman ICRP inhaled intake ionization ionizing radiation isotopes latitude lung marrow measurements minerals mrad mrad/y mrem mrem/y muons Natural Radiation Environment NCRP Report neutron nuclear nuclides O'Brien Oakley ocean Osteocytes outdoor pCi/kg percent population potassium production rates protons radiation field Radiation Protection radioactive Radiological radionuclides radium radon daughters rate in air ratio rocks rubidium Safety Laboratory significant soft tissue soil solar solar minimum Spallation sub-series surface thorium thoron tion tritium troposphere United UNSCEAR uranium series USAEC Report values variations Washington weapons tests whole body York