Development of a Target System for Compact Neutron Source using 8-10 MeV Proton Beam for Medical and Industry Application

在东海BNCT设施中，使用了8 MeV质子加速器来实现非常低的残留放射性。需要80千瓦的束流功率来产生非常强的中子通量。靶的研制是实现低剩余放射性和高抗泡能力的关键。将厚度为0.5 mm、直径为180 mm的铍板粘接在质子束停止的起泡坚韧金属上。我们使用由铜制成的散热器来去除4.5 MW/m2的极高热密度。因此，这两层（铍和起泡的坚韧金属）已结合的铜散热器。三层靶的热导率为200 W/m.K，约为纯铜的一半。我们成功地研制了BNCT用三层耐泡中子靶。

In the Tokai BNCT facility,an 8-MeV proton accelerator is used to realize very low residual radioactivity. An 80-kW beam power is required to generate very intense neutron flux. Target development is a key issue to realize both low residual radioactivity and high blistering tolerance. A beryllium plate with 0.5-mm thickness and 180-mm diameter is bonded on the blistering tough metal in which proton beam is stopped. We use a heat sink made of copper to remove very high heat density of 4.5 MW/m2. Thus this two tier (beryllium and blistering tough metal) has been bonded of a copper heat-sink. Three tier target has a heat conductivity of 200W/m.K, which is about half of pure copper. We successfully have developed the three tier blistering tolerant neutron target for BNCT.