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首页> 美国卫生研究院文献>Journal of Synchrotron Radiation >U-shape rotating anti-cathode compact X-ray generator: 20 times stronger than the commercially available X-ray source
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U-shape rotating anti-cathode compact X-ray generator: 20 times stronger than the commercially available X-ray source

机译：U形旋转防阴极紧凑型X射线发生器：比市售X射线源强20倍

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A new type of U-shape anti-cathode X-ray generator in which the inner surface of a cylindrical target is irradiated by an electron beam has been made by modifying a conventional rotating anti-cathode X-ray generator whose brightness in the catalog is 12 kW mm−2. The target material (Cu), target radius (50 mm) and rotating speed (6000 r.p.m.) were not changed in this modification. A brightness of 52 kW mm−2 was obtained by this U-shape-type X-ray generator. This means that the brightness of the new type is 4.3 times greater than that of the old unmodified one. Furthermore, the new-type X-ray generator yielded a brightness of 129 kW mm−2 by adding a carbon coating on the Cu target. This means an overall increase of brightness of ten times. The original generator has the highest brightness in the generators of the same class (having a radius of 50 mm and rotation speed of 6000 r.p.m.). Observations showed that Cu Kα counts at vertical incidence of the electron beam onto the surface of the new target, which is initially optically smooth, decrease as the surface is roughened by a severe thermal stress caused by strong electron beam exposure. Further observation reveals, however, that oblique incidence of the electron beam onto the roughened surface drastically increased the X-ray output and amounts to twice as much as that from a smooth surface at vertical incidence. Thus, at the present stage, an overall increase of brightness has been realised at a level 20 times stronger than that of the original commercially offered X-ray generator that we modified.
机译：通过修改目录中亮度为的常规旋转式反阴极X射线发生器，制造了一种新型U形反阴极X射线发生器，其中圆柱形靶的内表面被电子束照射。 12 kW mm -2 。在该变型中，目标材料（Cu），目标半径（50 mm）和旋转速度（6000 r.p.m.）没有改变。用这种U形X射线发生器得到的亮度为52 kW mm -2 。这意味着新类型的亮度是未修改旧类型的亮度的4.3倍。此外，新型X射线发生器通过在Cu靶材上添加碳涂层，产生了129 kW mm -2 的亮度。这意味着亮度总体提高了十倍。原始发电机在同类发电机中具有最高的亮度（半径为50 mm，转速为6000 r.p.m.）。观察结果表明，CuKα在电子束垂直入射到新靶材表面上时就开始计数，该靶材最初在光学上是光滑的，随着表面由于强力电子束曝光引起的严重热应力而变得粗糙而减少。然而，进一步的观察表明，电子束倾斜入射到粗糙表面上会大大增加X射线输出，并且是垂直入射时光滑表面的两倍。因此，在现阶段，已经实现了整体亮度的增强，其强度是我们修改过的原始商用X射线发生器的强度的20倍。

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