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The Lethal Flux of Neutrons at Energies up to 3 MeV

Royal Military College of Science, Shrivenham, Wilts^*

This excerpt was created in the absence of an abstract.

The 50 per cent lethal flux of neutrons at energies up to 3 MeV is calculated from the assumptions that (a) the 50 per cent lethal dose of rays is 400 r, (b) the relative biological efficiency of protons is 6·5, and (c) that the criterion for lethal effects is the equivalent amount of ionization produced in the whole body. For isotropic incidence the 50 per cent lethal flux varies from 1·6 x 10¹² n/cm² at thermal energy to 1·7 x 10¹⁰ n/cm² at 3 MeV.

^* Now at H.Q. Ammunition Organization, R.O.A.C., Long Drive, Greenford, Middlesex.

Accepted for publication October 1, 1953.