【摘要】 简单介绍了重离子治癌的原理,叙述了一种用于重离子治癌的大面积平行板雪崩计数器,它主要由入射窗、x位置栅极、中心阳极、y位置栅极和出射窗组成.使用C3F8气体,气压700Pa,阳极电压为700V,两阴极接地,电子学成形时间常数为2μs,测试得到的位置分辨修正后为0.54mm(FWHM).通过与国内外同类装置比较,认为这一分辨已经满足了重离子治癌装置的要求.更多还原

【Abstract】 The principle of the heavy-ion therapy is introduced in this article. In order to precisely determine the irradiation profiles and positions of scanned heavy-ion beams, we developed a large area parallel plate avalanche counter（PPAC）. The detector consists of one anode, two cathodes and two windows with 250 mm×250 mm active area . It was measured at an anode voltage of 700 V and with flowing C₃F₈ gas at the pressure of 700 Pa. A position resolution of 0.54 mm by correction was obtained with an α-source. As compared with the similar devices, we consider the position resolution of the PPAC can satisfy the requirement of the facility of heavy-ion therapy.更多还原