中文摘要：

利用FLUKA程序,对韩国浦项加速器实验室的2.5 GeV电子直线加速器辐射退磁实验系统进行蒙特卡罗模拟,得到了永久磁铁处各种粒子（包括光子、电子、中子及质子）的能谱以及注量的空间分布。根据实验中的束流强度,估算出永久磁铁所受的吸收剂量率和1 MeV等效中子注量率分别为18.7 Gy/s和6.37×10^7cm^-2.s^-1。

英文摘要：

Monte-Carlo simulation of the radiation-induced demagnetization experiment system with 2. 5 GeV electron linear accelerator at Korea Pohang Accelerator Laboratory （PAL） was carried out with FLUKA code. The spectra of various particles, inclu- ding photon, electron, neutron and proton, and spatial distribution of fluence were derived. Furthermore the absorbed dose rate and 1 MeV equivalent neutron fluence of permanent magnet were estimated as 18.7 Gy/s and 6.37 × 10^7 cm^-2 . s^-1 according to the beam intensity in the experiment.