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Optimization of a 9 MeV electron accelerator Bremsstrahlung flux for photofission-based assay techniques using PHITS and MCNP6 Monte Carlo codes
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms ( IF 1.3 ) Pub Date : 2020-10-12 , DOI: 10.1016/j.nimb.2020.10.002
I. Meleshenkovskii , T. Ogawa , A. Sari , F. Carrel , K. Boudergui

Photofission-based active non-destructive assay is a promising technique for nuclear waste characterization. The latter is challenging due to the presence of actinides, fission products and non-homogeneous matrix. This paper presents an optimization study of a 9 MeV linear electron accelerator used as a source of Bremsstrahlung photons for such photofission applications. The primary focus is made on qualitative and quantitative assessment of the Bremsstrahlung flux, timing characteristics and reduction of background neutrons. Assessment is conducted using Monte Carlo simulations in particle transport codes PHITS and MCNP6 with an objective to compare the simulation results. Our results demonstrate a good agreement between the simulation results of both codes. However, for an effective application of the photofission technique for nuclear waste assay, a careful selection of the target material and introduction of parasitic neutron suppression techniques are necessary. Analysis routines and simulation procedures are described in detail and results are presented.



中文翻译:

使用PHITS和MCNP6蒙特卡洛代码对基于光裂变的测定技术优化9 MeV电子促进剂Bre致变通量

基于光裂变的主动无损检测是一种有前途的核废料表征技术。由于存在act系元素,裂变产物和非均质基质,后者具有挑战性。本文介绍了一种9 MeV线性电子加速器的优化研究,该电子加速器用于此类光裂变应用中的Bre致辐射光子。主要重点是对ms致辐射通量的定性和定量评估,定时特性和背景中子的减少。使用蒙特卡洛模拟法对粒子传输代码PHITS和MCNP6进行评估,目的是比较模拟结果。我们的结果表明两个代码的仿真结果之间有很好的一致性。然而,为了将光裂变技术有效地用于核废料分析,必须仔细选择目标材料并引入寄生中子抑制技术。详细描述了分析程序和仿真程序,并给出了结果。

更新日期:2020-10-12
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