【摘要】 <正> 一、前言 国内外日益广泛地应用射线(x-射线、γ-射线、中子束等)无损检测构件的内部缺陷和研究物质的内部形态,例如 用x-射线进行木材缺陷的险测。本文利用γ-射线对树木年轮进行了无损检测的尝试。γ-射线源无需水源、电源,体积小,便于野外作业,可能成为树木年轮和木材缺陷无损险测的有力工具。更多还原

【Abstract】 This paper described the transmissive photographic experiment on a part of different kind of trees with two types of r-ray sources. The negatives obtained sharply recorded the distribution of tree growth rings, The discussion about the two methods of photography and the conditions of trasmissive photography was also included in this paper. Evidently the r-ray has been proved by the experiment to be very effective and non-destructive means of measuring tree growth rings and detecting possible defects inside trees.更多还原