Burn Kenneth W, Casalini Lodovico, Nava Elisabetta, Petrovich Carlo, Tecchio Luigi
ENEA FIS-NUC, V. M. Monte Sole 4, 40129 Bologna, Italy.
Radiat Prot Dosimetry. 2005;116(1-4 Pt 2):89-94. doi: 10.1093/rpd/nci030.
The Study and Production of Exotic Species (SPES) project employs a 100 MeV, 30 mA proton beam that strikes a primary target. The resulting high-energy neutron flux impinges on a secondary target of depleted uranium to produce, through fission, beams of short-lived, neutron-rich nuclei. This paper deals with some of the preliminary shielding calculations for the bunker. Monte Carlo is employed with MCNPX and, because of the deep penetrations involved, the in-house variance reduction optimiser, the direct statistical approach. The calculations exhibited a number of typical features that are addressed and discussed.
外来物种研究与生产（SPES）项目使用一束能量为100兆电子伏特、电流为30毫安的质子束撞击一个初级靶。由此产生的高能中子通量撞击贫铀次级靶，通过裂变产生短寿命、富中子核束。本文论述了掩体的一些初步屏蔽计算。采用蒙特卡罗方法和MCNPX进行计算，由于涉及深度穿透问题，还使用了内部方差减少优化器和直接统计方法。计算结果呈现出一些典型特征，本文将对这些特征进行阐述和讨论。
