Abstract
According to the "little boy" data from the United States, this paper simulates the primary γ-ray of the nuclear explosion and the secondary γ-ray produced by neutron, γ-ray and material interaction. At the same time, the linear attenuation coefficient spectra of 0.001mev to 100mev was calculated. The information was obtained from the point of the source projection of 500 meters to 1km. The results showed in the observation distance: The attenuation of the primary γ-ray energy was in line with the spectral γ-ray passing through the law of shielding the decay of the material. and it showed the phenomenon of the "hardening" of the energy spectrum. The fluence decreases an order of magnitude. The energy of the secondary γ-ray does not showed obvious attenuation laws, and the fluence decreases by about two orders of magnitude. It was worth noting that the average energy of the two kinds of γ-ray was around 2.100 MeV, and the fluence was in the same order of magnitude at 1km from the distance simulation.
Highlights
The "little boy" atomic bomb was produced when it exploded in the atmosphere γ radiation, can be divided into primary γ radiation and secondary γ radiation
According to the definition of reference, primary γ radiation mainly includes fission released during fission γ Fission fragments released by rays and fission products γ-ray, and there are homoenergetic transitions γ Etc; secondary γ radiation comes from the interaction of neutrons with projectile materials and surrounding media γ radiation, mainly capture γ 、 Inelastic scattering γ And induced radioactivity γ radiation, etc
This article was elementary γ Ray refers to the "little boy" atomic bomb source term data given in the shell γ Rays, secondary γ Ray refers to the "little boy" atomic bomb source data given out of the shell neutrons and matter produced by the interaction γ Rays
Summary
The "little boy" atomic bomb was produced when it exploded in the atmosphere γ radiation, can be divided into primary γ radiation and secondary γ radiation. According to the definition of reference, primary γ radiation mainly includes fission released during fission γ Fission fragments released by rays and fission products γ-ray, and there are homoenergetic transitions γ Etc; secondary γ radiation comes from the interaction of neutrons with projectile materials and surrounding media (such as air, soil, etc.) γ radiation, mainly capture γ 、 Inelastic scattering γ And induced radioactivity γ radiation, etc. This article was elementary γ Ray refers to the "little boy" atomic bomb source term data given in the shell γ Rays, secondary γ Ray refers to the "little boy" atomic bomb source data given out of the shell neutrons and matter produced by the interaction γ Rays
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