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用大容积(φ60mm×80mm)的圆柱型流气式组织等效正比计数器测定了~(252)Cfα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发生能量沉积的机率R_b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z_(1D)(Gy)与距径迹核径向距离b(μm)之间符合z_(1D)=ab~(-x)的函数关系,当b<0.6482μm时,α=0.328,x=1.7;当b≥0.6482μm时,α=0.288, x=2.给出了求最大径向距离的方法.
The micro-dosimetry and radial dose distribution of ~ (252) Cfα particles were measured with a large volume (φ60mm × 80mm) cylinder-type flow-tissue equivalent proportional counter. The alpha particle beam penetrates directly into the proportional counter The probability of occurrence of energy deposition R_b is 1. The measurement results confirm that the coincidence of the average specific energy z 1D (Gy) and the radial distance b (μm) from the track nucleus deposited by a single event along the α particle track (1) = ab ~ (-x), α = 0.328 and x = 1.7 for b <0.6482μm, α = 0.288 and x = 2 for b≥0.6482μm, The method of radial distance.