一 用原子序数较小的金属作为X射线管内的阳极靶面而产生的X射线,波长较长,穿透能力较弱,被称为软X射线。用这种射线作为光源进行透视摄影,称为软X射线摄影,或简称射线摄影。近二三十年来,国外已将软X射线摄影作为基本检验技术,逐步应用于生产和许多学科领域。1953年,瑞典的Simak和Gustafsson用软X射线检查出了林木种子中的饱满粒、空粒和畸形种粒。六十年代初期,日本用它透视含苞未放的花朵。六十年代中期和七十年代初,瑞典的Kamra利用这种技术检验欧洲赤松和挪威云杉的发芽能力,并同靛蓝染色法作过比较。1974年召开过X射线检验种子的国际讨论会。1975年在英格兰召开的“国际森林树木种子专题讨论会”上,软X射线检验被列为讨论的专题之一。据这个会议统计,当时世界上已有五十多个林木种子实验室拥有这种技术装备。1976年,Kamra发表了应用软X射线摄影术检查165种热带林木种子品质的结果。为了探讨软X射线摄影术 A metal with a smaller atomic number as the X-ray tube anode surface generated X-ray, longer wavelength, penetration is weak, is called soft X-ray. Use this ray as a light source for fluoroscopy, known as soft X-ray photography, or simply radiography. Nearly two or three decades, foreign countries have soft X-ray photography as the basic testing technology, and gradually applied to the production and many disciplines. In 1953, Sweden’s Simak and Gustafsson detected soft, bulky and malformed seeds in tree seeds using soft X-rays. In the early 1960s, Japan used it to see the buds of the buds. In the mid-1960s and early 1970s, Kamra, Sweden, used this technique to test the germination ability of Pinus densiflora and Norwegian spruce and compared it to indigo. 1974 International Symposium on X-ray Seeds Seeds Held. Soft X-ray testing was listed as one of the topics under discussion at the International Symposium on Forest Tree Seeds, held in England in 1975. According to this conference statistics, there were more than 50 tree seed laboratories in the world possessing this kind of technical equipment. In 1976, Kamra published the results of applying soft X-ray photography to examine the quality of 165 species of tropical forest trees. In order to explore soft X-ray photography