Measurement of thermal neutron fluence distribution with use of 23Na radioactivation around a medical compact cyclotron
Measurement of thermal neutron fluence distribution with use of 23Na radioactivation around a medical compact cyclotron
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利用医用紧凑型回旋加速器周围的 23Na 放射性激活测量热中子注量分布
DOI：
10.1007/s12194-009-0060-7
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发表时间：
2009
影响因子：
1.6
通讯作者：
T. Sakae
中科院分区：
文献类型：
--
作者：
T. Fujibuchi;I. Yamaguchi;Tetsuharu Kasahara;T. Iimori;Y. Masuda;K. Kimura;Hiroshi Watanabe;T. Isobe;T. Sakae
一台医学紧凑型回旋加速器每天产生约1015个中子和100 Gbq的18F。因此，为日常操作、维护工作和退役建立关于残留放射性的辐射安全指南是很重要的。因此，我们开发了一种简单的方法来测量回旋加速器室内的热中子。为了验证我们所提出的方法的可行性，我们利用23Na在盐中的活化作用测量了回旋加速器周围的热中子分布。我们在回旋加速器房间安装了78个盐剂量计，网目为50厘米。测量了~(24)Na的光峰，估算了中子通量分布。监测回旋加速器内的中子注量率分布，不仅有助于准确估计诱发放射性的分布，而且有助于优化辐射安全屏蔽设计，为退役过程做好准备。
A medical compact cyclotron produces about 1015 neutrons per day along with 100 GBq of 18F. Therefore, it is important to establish radiation safety guidelines on residual radioactivity for routine operation, maintenance work, and decommissioning. Thus, we developed a simple method for measuring the thermal neutrons in a cyclotron room. In order to verify the feasibility of our proposed method, we measured the thermal neutron distribution around a cyclotron by using the activation of 23Na in salt. We installed 78 salt dosimeters in the cyclotron room with a 50 cm mesh. The photopeak of 24Na was measured, and the neutron flux distribution was estimated. Monitoring the neutron flux distribution in a cyclotron room appears to be useful for not only obtaining an accurate estimate of the distribution of induced radioactivity, but also optimizing the shield design for radiation safety in preparation for the decommissioning process.