Recent results form measurements of the energy spectrum of cosmic-ray induced neutrons aboard an ER-2 airplane and on the ground.
Adv Space Res
; 32(1): 35-40, 2003.
Article
en En
| MEDLINE
| ID: mdl-14727660
ABSTRACT
Crews of future high-altitude commercial aircraft may be significantly exposed to atmospheric cosmic radiation from galactic cosmic rays (GCR). To help determine such exposures, the Atmospheric Ionizing Radiation Project, an international collaboration of 15 laboratories, made simultaneous radiation measurements with 14 instruments on a NASA ER-2 high-altitude aircraft. The primary instrument was a sensitive extended-energy multisphere neutron spectrometer, which was also used to make measurements on the ground. Its detector responses were calculated for neutrons and charged hadrons at energies up to 100 GeV using the radiation transport code MCNPX. We have now recalculated the detector responses including the effects of the airplane structure. We are also using new FLUKA calculations of GCR-induced hadron spectra in the atmosphere to correct for spectrometer counts produced by charged hadrons. Neutron spectra are unfolded from the corrected measured count rates using the MAXED code. Results for the measured cosmic-ray neutron spectrum (thermal to >10 GeV), total neutron fluence rate, and neutron dose equivalent and effective dose rates, and their dependence on altitude and geomagnetic cutoff generally agree well with results from recent calculations of GCR-induced neutron spectra.
Buscar en Google
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Aeronaves
/
Monitoreo de Radiación
/
Exposición Profesional
/
Radiación Cósmica
/
Neutrones
Límite:
Humans
Idioma:
En
Revista:
Adv Space Res
Asunto de la revista:
MEDICINA AEROESPACIAL
Año:
2003
Tipo del documento:
Article
País de afiliación:
Estados Unidos