Ferrari A, Mitaroff A, Silari M
CERN, Geneva, Switzerland.
Phys Med. 2001;17 Suppl 1:115-8.
A reference facility for the intercomparison of active and passive detectors in high-energy neutron fields is available at CERN since 1993. A positive charged hadron beam (a mixture of protons and pions) with momentum of 120 GeV/c hits a copper target, 50 cm thick and 7 cm in diameter. The secondary particles produced in the interaction are filtered by a shielding of either 80 cm of concrete or 40 cm of iron. Behind the iron shielding, the resulting neutron spectrum has a maximum at about 1 MeV, with an additional high-energy component. Behind the concrete shielding, the neutron spectrum has a pronounced maximum at about 70 MeV and resembles the high-energy component of the radiation field created by cosmic rays at commercial flight altitudes. The facility is used for a variety of investigations with active and passive neutron dosimeters. Its use for measurements related to the space programme is discussed.
自1993年起，欧洲核子研究组织（CERN）就有一个用于在高能中子场中对有源和无源探测器进行比对的参考设施。一束动量为120 GeV/c的带正电强子束（质子和π介子的混合物）撞击一个50厘米厚、直径7厘米的铜靶。相互作用产生的次级粒子由80厘米厚的混凝土或40厘米厚的铁屏蔽进行过滤。在铁屏蔽之后，产生的中子能谱在约1 MeV处有一个最大值，并伴有一个额外的高能成分。在混凝土屏蔽之后，中子能谱在约70 MeV处有一个明显的最大值，类似于商业飞行高度下宇宙射线产生的辐射场的高能成分。该设施用于对有源和无源中子剂量计进行各种研究。文中还讨论了其在与太空计划相关测量中的应用。
