Improvement of image contrast in x-ray transmission micrographs of organism with a titanium tube

To improve the image contrast in X-ray transmission micrographs of organisms, a fine-focus sealed-off tube with a titanium target has been built, which can produce quasi monochromatic X-rays at the K sub(α) characteristic wavelength of 2.7 A. The intensity ratio of the characteristic ray to continuous ones reaches a maximum when a voltage of 8 kV is applied to the tube. Micrographs of organisms obtained with this tube show up a better image contrast than those taken with a copper-anode tube. (author)