Radiant energy – Radiation controlling means
Patent
1992-03-27
1993-03-30
Berman, Jack I.
Radiant energy
Radiation controlling means
378147, 378149, 164 98, G21K 102
Patent
active
051986809
ABSTRACT:
A method for manufacturing a single focus collimator in a high precision without increasing a cost for manufacturing. In this method, grooves are on a bulk block member first, and a metallic material having sufficient .gamma. ray shielding property such as lead is casted into the grooves formed on the bulk block member, and then the bulk block member with the metallic material casted into the grooves is immersed into a solvent capable of dissolving the bulk block member but not the metallic material, such that a collimator body formed by the metallic material in a shape of the grooves is obtained as the bulk block member is dissolved by the solvent. The sensitivity of the single focus collimator can be made substantially uniform over the entire effective view field by forming the grooves with such intervals that holes formed on the collimator body have larger size toward a center of the collimator body.
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Berman Jack I.
Kabushiki Kaisha Toshiba
Nguyen Kiet T.
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