Neutron measurements around a beam dump bombarded by high energy protons and lead ions

Measurements of the spectral fluence and the ambient dose equivalent of secondary neutrons produced by 250 GeV/c protons and 158 GeV/c per nucleon lead ions were performed at CERN around a thick beam dump. The experimental results obtained with protons were compared with calculations performed with the FLUKA Monte Carlo code. As the available Monte Carlo codes do not transport particles with mass larger than one atomic mass unit, it is shown that for high energy heavy ions, estimates can be carried out by scaling the result of a Monte Carlo calculation for protons by the projectile mass number.