利用Ｍｏｎｔｅ Ｃａｒｌｏ方法，计算了在不同的几何条件下平面放射源出射的重离子在圆柱体中的弦长的概率密度。计算结果表明，弦长分布函数及平均弦长具......

<正> Our rice seeds which were let between in the CR-39 solid state nuclear track detectors were carried on Shenzhou III......