Radiological hazard of long-lived spallation products in accelerator-driven system

The present paper focuses on analysis of radiological hazard of spallation products that appears to be an important factor that might affect the choice of beam/target performance in designing the accelerator-driven systems. The analysis is done in terms of toxicity expressed in units of Annual Limit on Intake (ALI). It reveals the significant contribution of alpha emitting rare earths ( 146 Sm, 148 Gd, 150 Gd, 154 Dy) into overall toxicity of spallation targets.