摘要
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。
Microdsimetric spectra and radial dose distribution of 239 Pu α particles were measured by the cylindrical flowing tissue equivalent proportional counter with larger volume. Because of the best collimated beam traverse in TEPC (tissue equivalent preportional courreer), the probability of energy deposition per ion traversal R b is 1. The measured dose mean specific energy z 1D from single event varies strictly in accordance with formula z 1D = ab -2 , b is the radial distance from track core. The method of determination of the coefficient a is given.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
1998年第2期168-172,共5页
Atomic Energy Science and Technology
基金
国家自然科学基金
关键词
正比计数器
微剂量谱
径向剂量分布
钚239
Tissue equivalent proportional counter Microdosimetric spectrum Radial dose distribution Maximum radial distance
