Some geometrical considerations for x-ray collimation in single-crystal diffraction work

In positioning an x-ray tube in an experiment in order to gain optimum usable power, the variables at the operator's control are the take-off angle and the collimation (or slit) system. These variables should be fixed by consideration of sample size, focal-spot size, target "absorption shadow," and the amount of divergence to be permitted. Consideration of these factors leads to an uncommon collimator for simple large single-crystal diffraction work. © 1962 The American Institute of Physics.