RESIDUAL GAMMA RADIATION FIELDS FROM INDUCED SOIL ACTIVITIES Research and Development Technical Report USNRDL-TR-240;NS 081-001

摘要

The residual gamma radiation from neutron-induced activities in the soil around ground zero following a nuclear detonation is an important hazard in some situations. Two empirical profiles of activation vs depth in the soil are assumed and the characteristics of the direct gamma radiation field above the soil are computed. Scattered radiation is estimated to contribute about 86 percent as much hazard as the direct-radiation but is not computed.nThe characteristics for the induced radiation field are contrasted with the characteristics of a fallout radiation field and marked differences are found in the angular-distribution (more uniform), variation of total intensity with height (less), radius of the importantly contributing area (less), and the radiation protection afforded by a hole (much less).