Fehrenbacher G, Gutermuth F, Kozlova E, Radon T, Aumann T, Beceiro S, Le Bleis T, Boretzky K, Emling H, Johansson H, Kiselev O, Simon H, Typel S
GSI, Planckstr. 1, D-64291 Darmstadt, Germany.
Radiat Prot Dosimetry. 2007;126(1-4):497-500. doi: 10.1093/rpd/ncm100. Epub 2007 May 22.
Experiments were performed in Cave C of GSI (Gesellschaft für Schwerionenforschung) using the LAND (Large Area Neutron Detector) in combination with the deflection magnet ALADIN (A LArge DIpol magNet) in front of the LAND where charged particles and neutrons can be separated. This arrangement is used to create high-energetic neutron fields by irradiation of a thick lead target (5 cm) with deuteron beams with the energies of 500 or 800 MeV per nucleon. In break-up reactions the neutron is separated from the proton which is deflected in the magnetic field of the ALADIN. The produced neutron radiation, which has a pronounced peak at the nucleon energy, is used to measure the fluence response of the GSI neutron ball. A thermoluminescence (TL) based spherical neutron dosemeter was developed for the area monitoring for the quantity H(10) at high-energy accelerators. In the same experiment, the spectral neutron fluence Phi(E) is measured with the LAND in the energy range from 100 MeV to 1 GeV. The measured fluence responses are compared with results of FLUKA calculations and the corresponding fluence-to-dose conversion coefficients. The measured dosemeter responses are too high in comparison to the calculated ones (up to approximately 50%), the dosemeter reading gives dose values which are too high by a factor of 1.1-2.2 related to the corresponding fluence-to-dose conversion factors.
实验在德国重离子研究中心（GSI）的C洞穴中进行，使用大面积中子探测器（LAND）并结合LAND前方的偏转磁铁阿拉迪恩（ALADIN，一个大型偶极磁铁），在此处带电粒子和中子能够被分离。这种装置用于通过用每核子能量为500或800兆电子伏特的氘核束照射一个厚5厘米的铅靶来产生高能中子场。在破裂反应中，中子与在阿拉迪恩磁场中发生偏转的质子分离。所产生的中子辐射在核子能量处有一个明显的峰值，用于测量GSI中子球的注量响应。为在高能加速器处对H(10)量进行区域监测，开发了一种基于热释光（TL）的球形中子剂量计。在同一实验中，利用LAND在100兆电子伏特至1吉电子伏特的能量范围内测量中子能谱注量Phi(E)。将测量的注量响应与FLUKA计算结果以及相应的注量 - 剂量转换系数进行比较。与计算值相比，测量的剂量计响应过高（高达约50%），剂量计读数给出的剂量值比相应的注量 - 剂量转换因子高1.1 - 2.2倍。
