The use of collimators and shields for measurements and imaging with X- and γ -rays requires a well-defined
collimation for the pixels and well-determined formula for the effect of the collimators. We analyze the geometric effects
of tubular and pinhole collimators and the effects of curved shields for the case of omni-directional fluxes. These effects
can affect measurements of X- and γ-rays as well as UV rays behind the shield and collimators. On the other hand, such
effects can be used to enhance the capability of multi-spectral sensors by using appropriate covers in front of them.
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