Update of the GEANT4/MAX Simulation Anthropomorphic Model for High-Energy Neutrons Effective Dose Calculation
- Universidade Federal de Roraima (Brazil)
- Regional Center of Nuclear Sciences, Comissao Nacional de Energia Nuclear (Brazil)
The crews of present-day jet aircrafts are a significant occupationally exposed group, receiving relatively high effective doses from exposure to cosmic radiation, with the possibility of higher effective doses if the cruising altitudes of future aircrafts increase. To assess effective doses from exposure to cosmic radiation, the MAX (Male Adult voXel) phantom has been coupled with the GEANT4 Monte Carlo code. This radiation transport code has been distributed and upgraded by a group of international scientists at CERN/Switzerland, and, among other types of radiation, allows for the simulation of neutron transport through matter. The high-energy neutrons contribute to about 70% of the neutron effective dose, which in turn represents between 35% and 60% of the total effective dose to aircraft crews, according to recent studies. The high-energy neutrons spectrum is obtained at aircraft altitude simulating 106 events, each one representing an extensive air shower produced from experimental distributed cosmic rays interactions with atmospherics atoms. The GEANT4/MAX simulation anthropomorphic model calculates the conversion coefficient from fluence to effective dose of cosmic rays neutrons for the (80-120)MeV energetic interval and of 10x5 monoenergetic 100-MeV neutrons. A comparison of the values from the two methods gives an estimation of aircraft environment condition, which is a very important influencing factor. The main obstacle in this research is the long air showers simulation time required to obtain validatable data. An upgrade of the two methods comparison result is presented but is not conclusive, while the monoenergetic irradiation traditional method is in agreement with the literature.
- OSTI ID:
- 20719563
- Journal Information:
- AIP Conference Proceedings, Vol. 795, Issue 1; Conference: 2. IUPAP international conference on women in physics, Rio de Janeiro (Brazil), 23-25 May 2005; Other Information: DOI: 10.1063/1.2128356; (c) 2005 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
Similar Records
NASA’s first ground-based Galactic Cosmic Ray Simulator: Enabling a new era in space radiobiology research
Comparison of Measurements with Active and Passive Bonner Sphere Spectrometers
Related Subjects
ADULTS
AIRCRAFT
ALTITUDE
AVIATION PERSONNEL
CERN
COMPUTERIZED SIMULATION
COSMIC NEUTRONS
EXTENSIVE AIR SHOWERS
MEV RANGE 10-100
MEV RANGE 100-1000
MONTE CARLO METHOD
NEUTRON SPECTRA
NEUTRON TRANSPORT
NEUTRON TRANSPORT THEORY
PERSONNEL DOSIMETRY
PHANTOMS
RADIATION DOSES