Dose assessment analysis on neutron source terms of 70 MeV proton and UC2 target reaction for RAON ISOL target system

Progress in Nuclear Science and Technology Pub Date : 2019-01-31 DOI:10.15669/PNST.6.247

Chewook Yim, Do-Hyun Kim, Jae Hyun Kim, Jae Yong Lee, Quang Huy Khuat, M. Woo, C. Shin, Jong Kyung Kim, Sangjin Lee, S. Nam, Jongwoo Kim, Bo Kyun Seo

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Abstract

Isotope Separator Online (ISOL) facility at the Institute for Basic Science (IBS) in South Korea has been designed for producing rare isotopes. The purpose of this work was to analyze the effect of the strategy on neutron source term to evaluate effective dose for ISOL target room. Several neutron source terms were generated by varying the dimensional distribution, the number of angular divisions, and the number of energy divisions. For the dimensional distribution of neutron source, a cylindrical distribution with same shape as the target was recommended in front wall and a cylinder and a point distribution were recommended in side wall. Also, more than 32 angle divisions which had within 1.5 % discrepancy both in the front and side wall was recommended for dividing angles. In a case of dividing energies, a discrepancy within 2 % was shown in the source terms divided into more than 100 divisions. However, in case that discrete energy distribution is used, the dose was highly overestimated as the number of energy divisions decreases.

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RAON ISOL靶体系70 MeV质子与UC2靶反应中子源项剂量评估分析

韩国基础科学研究所(IBS)的同位素分离器在线(ISOL)设施是为生产稀有同位素而设计的。本工作的目的是分析策略对中子源项的影响，以评估ISOL靶室的有效剂量。通过改变中子源的量纲分布、角分裂数和能量分裂数，生成了若干中子源项。对于中子源的尺寸分布，建议在前壁采用与靶形相同的圆柱形分布，在侧壁采用圆柱形和点形分布。同时，建议采用32个以上的角度划分，前后壁的差异在1.5%以内。在划分能量的情况下，将源项划分为100多个部分，显示出2%以内的差异。但是，如果采用离散能量分布，则随着能量划分次数的减少，剂量被高度高估。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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Progress in Nuclear Science and Technology

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