Fluence to H_p (3) conversion coefficients for neutrons from thermalto 15 mev

The recent statement on tissue reactions issued by the International Commission on Radiological Protection in April 2011 recommends a very significant reduction in the equivalent dose annual limit for the eye lens from 150 to 20 mSv y^-1; this has stimulated a lot of interest in eye lens dosimetry in the radiation protection community. Until now no conversion coefficients were available for the operational quantity H_p(3) for neutrons. The scope of the present work was to extend previous evaluations of H^z.ast;(10) and H_p(10) performed at the PTB in 1995 to provide also H_p(3) data for neutrons. The present work is also intended to complete the studies carried out on photons during the last 4 y within the European Union-funded ORAMED (optimisation of radiation protection for medical staff) project.