MacKay J F, Pearson D W, Nelms B E, DeLuca P M, Gould M N, Lagally M G
Department of Medical Physics, University of Wisconsin, Madison 53706, USA.
Med Phys. 1998 May;25(5):773-9. doi: 10.1118/1.598259.
A double-mirror multilayer monochromator was developed for the purpose of irradiating live cell cultures at the Synchrotron Radiation Center, University of Wisconsin-Madison. The monochromator is designed for the soft x-ray region with photon energies between 270 and 2400 eV. Multilayer mirrors with 55 bilayers of W/C and a bilayer spacing of d = 3.0 nm are sputter deposited on Si substrates. By proper masking of the sputtering sources, variation in the bilayer spacing over the area of the mirror is minimized. The uniformity of the bilayer spacing was measured to be delta d/d < 1%, over the 75 mm x 25 mm area of the mirrors. The reflectivity was measured as a function of energy to determine the integrated reflectivity and evaluate the contribution of the specular reflection and higher orders to the monochromatic beam. The use of suitable filters with a Si(Li) detector allows determination of the spectral output of the monochromator. The output power of the monochromator between 270 and 2400 eV is measured. The resolution of the monochromator is delta lambda/lambda = 0.04. Applications of the monochromator to radiation biology are discussed.
为了在威斯康星大学麦迪逊分校的同步辐射中心对活细胞培养物进行辐照，研制了一种双镜多层单色仪。该单色仪设计用于光子能量在270至2400电子伏特之间的软X射线区域。在硅衬底上溅射沉积了具有55个W/C双层且双层间距d = 3.0纳米的多层镜。通过对溅射源进行适当掩蔽，使镜面上双层间距的变化最小化。在75毫米×25毫米的镜面区域内，测得双层间距的均匀性为Δd/d < 1%。测量反射率作为能量的函数，以确定积分反射率，并评估镜面反射和高阶反射对单色光束的贡献。使用带有Si(Li)探测器的合适滤光片可确定单色仪的光谱输出。测量了270至2400电子伏特之间单色仪的输出功率。单色仪的分辨率为Δλ/λ = 0.04。讨论了该单色仪在辐射生物学中的应用。
