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Radiation Protection Dosimetry 27:189-192 (1989)
© 1989 Oxford University Press

The Intensity Distribution of Secondary Particles Produced in High Energy Proton Interactions

A.H. Sullivan

An empirical relation is presented that appears to describe the intensity and angular distribution of secondary hadrons around targets struck by high energy protons in the energy range from 50 MeV to 500 GeV with sufficient accuracy for making radiation protection estimates. This relation gives the hadron fluence F (particles.cm-2 per interacting proton) at 1 metre and at an angle _ degrees to the direction of a proton of energy E GeV interacting in a copper target of: F = 1/(2[_ + (35/(_)]2) Above 5 GeV the fluence corresponds to that of hadrons of energy greater than 40 MeV, whereas for incident protons below 2 GeV the formula is shown to predict the distribution of fast neutrons emitted in an interaction. Comparisons are presented between predictions using the above relation and measured and theoretical fluxes, particle multiplicities, and dose rates. No serious discrepancies have been found over the entire proton energy range from 50 MeV to 500 GeV,


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