Characteristics of the KUR Heavy Water Neutron Irradiation Facility as a neutron irradiation field with variable energy spectra
Characteristics of the KUR Heavy Water Neutron Irradiation Facility as a neutron irradiation field with variable energy spectra
复制标题
DOI：
10.1016/s0168-9002(00)00465-4
复制
发表时间：
2000-10-21
影响因子：
1.4
通讯作者：
Kobayashi, T
中科院分区：
文献类型：
--
作者：
Sakurai, Y;Kobayashi, T
京都大学研究堆（KUR）的重水中子辐照设施（HWNIF）于1996年3月更新，主要是为了改进中子俘获治疗（NCT）。更新后的设施的一个显著特点是，中子束的能谱可以在5分钟内通过远程控制在连续反应堆操作下从几乎纯热到超热进行控制。这一特点不仅有利于医学科学，如NCT，但也对其他研究领域，如物理，工程，生物学等的性能更新的设施作为一个中子辐照场与可变能谱，其特征在于。热中子通量、镉比、γ射线剂量率等，在正常照射位置的各种照射模式，主要是使用金激活箔和热发光剂量计（TLD）的测量的基础上确定的。重点研究了新型中子能谱移动器和镉热中子过滤器的性能，通过改变能谱移动器的重水厚度和镉过滤器的孔径大小来控制热中子和超热中子的混合比。在正常照射位置的中子能谱的评价也进行了三个代表性的照射模式，其中的中子强度是最大的所有照射模式。此外，还对两种辐照器械（即辐照轨道器械和远程患者运载器）的辐照特性进行了评价，这两种器械与设施更新同时更新。(C)2000 Elsevier Science B.V.保留所有权利。
The Heavy Water Neutron Irradiation Facility (HWNIF) of the Kyoto University Research Reactor (KUR) was updated in March 1996, mainly for the improvement in neutron capture therapy (NCT). A striking feature of the updated facility is that the energy spectrum of the neutron beam can be controlled from almost pure thermal to epi-thermal, within 5 min by remote control under a continuous reactor operation. This feature is advantageous not only to medical science such as NCT, but also to the other research fields such as physics, engineering, biology, etc. The performance of the updated facility as a neutron irradiation field with variable energy spectra, was characterized. Thermal neutron flux, cadmium ratio, gamma-ray dose rate, etc., at the normal irradiation position for various irradiation modes were determined, mainly on the basis of the measurement using gold activation foils and thermo-luminescent dosimeters (TLDs). The emphasis was on the performance of the new neutron energy spectrum shifter and cadmium thermal neutron filter, that control the mixing ratio of thermal and epi-thermal neutrons, through the change in the heavy water thickness of the spectrum shifter and the aperture size of the cadmium filter. The evaluation of neutron energy spectra at the normal irradiation position was also performed for three representative irradiation modes, in which the neutron intensities are largest of all the irradiation modes. In addition, the irradiation characteristics of two irradiation devices, namely the Irradiation Rail Device and the Remote Patient Carrier, which were updated concurrently with the facility update, were evaluated. (C) 2000 Elsevier Science B.V. All rights reserved.