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用大容积（６０ｍｍ×８０ｍｍ）的圆柱型流气式组织等效正比计数器测定了２３９Ｐｕα粒子的微剂量谱和径向剂量分布。α粒子束在无窗的情况下直接穿入正比计数器，由离子穿过而发生能量沉积的机率Ｒｂ为１。测量结果证实：沿α粒子径迹由单次事件沉积的剂量平均比能ｚ１Ｄ（Ｇｙ）与距径迹核径向距离ｂ（μｍ）之间完全符合ｚ１Ｄ＝ａｂ－２的函数关系，同时给出了求出最大径向距离（ｐｅｎｕｍｂｒａ）的方法。
The micro-dose spectrum and radial dose distribution of 239Puα particles were measured with a large-volume ( 60mm × 80mm) cylindrical flow-type tissue equivalent proportional counter. The alpha particle beam penetrates directly into the proportional counter without a window and the probability of energy deposition Rb is 1 due to the passage of ions. The measurement results show that the dose-average specific energy zd (Gy) and the radial distance b (μm) from the track nucleus deposited by a single event along the track are in complete agreement with the function z1D = ab-2, Find out the maximum radial distance (penumbra) method.