| 摘要 |
A neutron collimator with an adjustable irradiation field for an effective neutron radiation source includes a protective radiation casing; a frame surrounded by the casing; a plurality of individual carrier arms mounted on the frame; a plurality of pairs of opposite elongated wedge-shaped slabs arranged side by side such that respective ones of the opposite wedge-shaped slabs form a fan-shaped configuration which converges toward an apex at the neutron radiation source, each wedge-shaped slab being mounted for rotational and translational movement on a respective carrier arm such that the wedge-shaped slabs of each pair are mounted for motion towards and away from each other along a path which intersects the irradiation field for the neutron radiation source and such that the inner side surface of each wedge-shaped slab is always directed generally towards the neutron radiation source; and at least one bearing provided between each wedge-shaped slab and the respective carrier arm on which it is movably mounted.
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