This ensures that rays are recorded in their proper place on the plate, producing a clear image. The collimator comprises first and second layers of a plurality of elongated radiation blocking leaves. Only rays that are travelling nearly parallel to the holes will pass through them-any others will be absorbed by hitting the plate surface or the side of a hole. A multiple layer multileaf collimator for shaping a radiation beam. This allows energy selection in addition to collimation - the curvature of the collimator and its rotation will present a straight path only to one energy of neutrons. If this forms part of a rotating assembly, the sandwich may be curved. or if mechanical strength is needed then aluminium may be used. Gadolinium) with neutron transmitting material. This may be a sheet of lead or other material opaque to the incoming radiation with many tiny holes bored through it or in the case of neutrons it can be a sandwich arrangement (which can be up to several feet long - see ENGIN-X) with many layers alternating between neutron absorbing material (e.g. MLCs are made of steel leaves that rapidly open and close to shape the radiation beam to match the size of the tumor in the treatment plan as the radiation beam. In the lower panel of the figure, a collimator has been added (blue bars).
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