Radiation damage in the target area shielding of a facility for Selective Production of Exotic Species ( SPES Project )
The advancement of radioactive ion beam (RIB) science since its advent in the last few decades calls for the development of so-called next generation facilities, able to provide beam intensities several orders of magnitude higher than presently available. Two of them are planned by the European roadmap and are representative of the two main methods by means of which RIBs are produced nowadays: projectile fragmentation and isotope separation on-line (ISOL); the latter, based on the ISOL technique, is the EURISOL project: the plan encompasses the construction of three intermediate facilities, one of which is expected to be built at Legnaro (Padua) INFN Laboratories: the SPES Project (Selective Production of Exotic Species).
The Effects of Nuclear Radiation on the Mechanical Properties of Concrete
Synopsis: Previously published experimental data on the effect of nuclear radiation on the properties of plain concrete are surrrnarized and 2 evaluated. Neutron radiation with a fluence of rrore than 1 x 1o 19 n/cm may have a detrimental effect on concrete strength and rrodulus of elasticity. Thermal ooefficient of expansion, thermal conductivity and shielding properties of concrete are little affected by radiation. Radiation damage is mainly caused by lattice defects in the aggregates which cause a volume increase of aggregates and concrete. Different aggregates show different radiation resistance so that the selection of suitable aggregates is the rrost important parameter in the design of a radiation resistant concrete.
Generalized Biot Formulation for the Mechanics of Saturated-Unsaturated Porous Media
A generalized Biot formulation for the mechanics of saturated-unsaturated porous media is presented. Particular emphasis is given to the derivation of a modified effective stress vector applicable in rock mechanics and concrete. An example relating to soil mechanics situation is presented.