Earticle

Recently, the number of students enrolled in local universities has decreased sharply due to the decrease in the school age population, and local universities are in danger of shrinking. At the same time, as demand for expansion of physical space owned by universities by activating online non-face-to-face classes has decreased significantly, it is important to establish strategies to efficiently utilize the resources currently owned. The purpose of this study is to analyze the institutional evaluation items and the purpose of itemized evaluation centered on the 2020 national university facility utilization evaluation, examine the space management regulations in the university, and derive improvements in the evaluation system. In this study, regarding the "National University Facilities Space Utilization Evaluation" conducted by regional-based universities, we will confirm the attitude of universities toward space sharing and opening, and proposed system improvement to share unused space.

본 연구는 사이클로트론 시설을 해체한 후 공간 활용을 위하여 RESRAD-BUILD 4.0 프로그램으로 방사선량 평가를 수행하였다. 평가대상 사이클로트론은 의료 분야에서 사용 빈도수가 가장 높은 PETtrace를 대상으로 진행하였다. 선량평가에 사용된 콘크리트는 NBS03 콘크리트와 Magnetite and steel 콘크리트 2종류를 사용하였다. 분석 핵종은 NBS03 콘크리트는 ⁵⁵Fe, ⁶⁰Co, ¹⁵²Eu, ¹³⁴Cs, ¹⁵⁴Eu, ¹⁵²Gd로 총 6가지, Magnetite and Steel은 ⁵⁴Mn가 추가되어 7종을 분석하였다. 평가 결과로 주된 피폭경로는 외부피폭으로 나타났으며, 핵종에 따른 방사선량 평가는 NBS03 콘크리트의 경우 ⁶⁰Co과 ¹⁵²Eu에 의한 피폭이, Magnetite and steel 콘크리트의 경우 ⁶⁰Co과 ⁵⁴Mn에 의한 피폭이 가장 높은 것으로 나타났다. 가동 연수에 따른 피폭선량의 차이는 크지 않은 것으로 나타났다. 근무자에 대한 피폭선량은 일반인 선량한도인 1 mSv에도 미치는 못한 것으로 나타났다. 따라서 사이클로트론 시설 해체 후 다양한 용도로 공간 활용이 가능할 것으로 사료된다. 향후 점차적으로 사이클로트론 해체는 늘어날 것으로 예상되며, 이에 본 연구 결과가 사이클로트론 시설 해체 후 공간 재활용에 대한 기초적인 자료로 사용될 수 있을 것으로 판단된다.

This study evaluated radiation doses using the RESRAD-BUILD 4.0 program to assess space reuse after decommissioning a cyclotron facility. The PETtrace cyclotron, widely used in the medical field, was selected for the analysis. two types of concrete were examined:: NBS03 concrete and magnetite and steel concrete. For NBS03 concrete, six radionuclides, including ⁵⁵Fe, ⁶⁰Co, ¹⁵²Eu, ¹³⁴Cs, ¹⁵⁴Eu, and ¹⁵²Gd, were analyzed, whereas seven radionuclides were considered for magnetite and steel concrete, adding ⁵⁴Mn to the aforementioned six radionuclides. The evaluation identified external exposure as the primary pathway. For NBS03 concrete, ⁶⁰Co and ¹⁵²Eu were the main contributors to radiation exposure, while for magnetite and steel concrete, ⁶⁰Co and ⁵⁴Mn were dominant. Operational duration had minimal impact on exposure dose. The radiation dose received by workers was below the 1 mSv dose limit for the general public, indicating that the space is safe for various uses after cyclotron dismantling. As cyclotron decommissioning is expected to increase, the findings of this study provide essential data to guide the repurposing of such facilities.